{"id":11106,"date":"2026-01-28T09:51:31","date_gmt":"2026-01-28T09:51:31","guid":{"rendered":"https:\/\/daivings.lv\/?p=11106"},"modified":"2026-01-28T09:52:19","modified_gmt":"2026-01-28T09:52:19","slug":"peldspejas-apmaciba-un-apguve-ar-jj-ccr-rebrideri","status":"publish","type":"post","link":"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/","title":{"rendered":"Buoyancy training and acquisition with the JJ-CCR rebreather"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Contents\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#Peldspejas_apguve_ar_slegta_loka_rebreatheru_CCR\" >Learning buoyancy with a closed-circuit rebreather (CCR)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#1_Pareja_no_atverta_loka_uz_slegta_loka_peldspeju\" >1. Transition from open-circuit to closed-circuit buoyancy<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#11_Butiska_atskiriba_fiksets_loka_tilpums\" >1.1. Key difference: fixed arc volume<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#12_Atverta_loka_ieradums_Kapec_elpas_kontrole_nedarbojas\" >1.2 The Open Loop Habit: Why Breath Control Doesn&#039;t Work<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#13_Galvenais_izaicinajums_vairaku_peldspejas_mainigo_lielumu_parvaldisana\" >1.3 Key challenge: managing multiple buoyancy variables<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#2_Peldspejas_un_trima_pamatprincipi_uz_JJ-CCR\" >2. Basic principles of buoyancy and trim on JJ-CCR<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#21_Peldspejas_fizika_Arhimeda_princips_slegta_loka\" >2.1. Physics of Buoyancy: Archimedes&#039; Principle in a Closed Loop<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#22_Pareizas_sversanas_kritiska_nozime\" >2.2 The critical importance of correct weighing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#23_Trima_loma_racionalizacija_un_stabilitate\" >2.3. The role of the tree: rationalization and stability<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#3_JJ-CCR_iekartas_loma_peldspejas_kontrole\" >3. The role of the JJ-CCR device in buoyancy control<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#31_Elposanas_loks_un_pretplausas\" >3.1. Respiratory circuit and counterlungs<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#32_Sausais_terps_un_sparns_primarie_peldspejas_riki\" >3.2 Drysuit and Wing: Primary Buoyancy Aids<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#4_Cels_uz_meistaribu_progresivi_peldspejas_un_trima_vingrinajumi\" >4. The Path to Mastery: Advanced Buoyancy and Trimming Exercises<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#41_1_faze_pamatvingrinajumi_sakotneja_prakse\" >4.1. Phase 1: Basic exercises (initial practice)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#42_2_faze_videja_limena_vingrinajumi_kompleksitates_un_kontroles_pievienosana\" >4.2. Phase 2: Intermediate exercises (adding complexity and control)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#43_3_faze_uzlaboti_vingrinajumi_instinktiva_kontrole\" >4.3. Phase 3: Advanced Exercises (Instinctive Control)<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#5_Biezi_sastopamu_peldspejas_problemu_risinasana_ar_JJ-CCR\" >5. Solving common buoyancy problems with JJ-CCR<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#51_%E2%80%9CPorpoising%E2%80%9D_un_nestabila_kustiba\" >5.1. Porpoising and unstable movement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#52_Netisas_peldspejas_nobides\" >5.2. Unintentional buoyancy shifts<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#6_Drosiba_pirmaja_vieta_Peldspejas_kontrole_konteksta\" >6. Safety First: Buoyancy Control in Context<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/#7_Secinajums_Bez_piepules_nirsanas_maksla_un_zinatne\" >7. Conclusion: The Art and Science of Effortless Diving<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Peldspejas_apguve_ar_slegta_loka_rebreatheru_CCR\"><\/span>Learning buoyancy with a closed-circuit rebreather (CCR) <span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">is a significant and necessary paradigm shift for divers transitioning from open circuit (OC) systems. The key difference is that the CCR breathing circuit is of fixed volume, which makes the traditional OC technique of using lung volume to control buoyancy ineffective. This article details the principles, advanced training methods, and problem-solving techniques required to achieve expert-level buoyancy and trim with the JJ-CCR device. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It emphasizes that mastery is a path in which ingrained skills are replaced by new, precise skills focused on proper weighting, dynamic trim adjustments, and a nuanced understanding of how rebreather gas management systems affect buoyancy. The report provides a structured framework of exercises and practical guidance to move the serious diver from basic competence to instinctive, effortless control.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Pareja_no_atverta_loka_uz_slegta_loka_peldspeju\"><\/span>1. Transition from open-circuit to closed-circuit buoyancy<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"11_Butiska_atskiriba_fiksets_loka_tilpums\"><\/span>1.1. Key difference: fixed arc volume<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The most important concept for a new CCR diver to learn is the fundamental difference in buoyancy management compared to open circuit scuba. In an OC system, the diver&#039;s lungs act as a variable buoyancy compensator.<sup><\/sup> By taking a deeper breath, an OC diver can increase his volume and gain a small amount of positive buoyancy, allowing him to gently ascend.<sup><\/sup> In turn, when you exhale completely, the volume decreases, allowing you to descend slightly.<sup><\/sup> This technique is the basis for open-circuit buoyancy control, and divers with extensive experience rely on it instinctively to precisely adjust their position in the water.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CCR, by its design, completely eliminates this principle. Rebreathers are a closed system that recycles exhaled gas, cleaning it of carbon dioxide and supplementing it with oxygen.<sup><\/sup> Exhaled gas is not expelled into the surrounding water as bubbles, but is collected in a flexible reservoir called a counterlung and returned to the diver for the next inhalation.<sup><\/sup> The diver&#039;s lungs and the rebreather&#039;s counterlung act as a single, fixed-volume breathing circuit.<sup><\/sup> Consequently, the total volume of gas in this closed system remains constant during a normal breathing cycle, and the diver&#039;s buoyancy does not change regardless of how deeply he inhales or exhales.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"12_Atverta_loka_ieradums_Kapec_elpas_kontrole_nedarbojas\"><\/span>1.2 The Open Loop Habit: Why Breath Control Doesn&#039;t Work<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The ingrained habit of using the breath to control buoyancy is a major obstacle for divers transitioning from open-circuit to closed-circuit diving.<sup><\/sup> Muscle memory, developed over hundreds of OC dives, is a powerful force that links a diver&#039;s breathing pattern to his depth.<sup><\/sup> New CCR divers often report a period where buoyancy feels \u201cuncomfortable\u201d and \u201cstrange\u201d as they instinctively try to use their lungs for small depth adjustments, only to find that it has no effect.<sup><\/sup> This can lead to frustration and physical consequences, such as \u201cporpoising\u201d (rising and falling like a dolphin) or colliding with obstacles over which they were instinctively trying to \u201cbreathe\u201d.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To achieve mastery, the diver must actively suppress this habit and replace it with a new mental model for buoyancy management. Attention must be fully transferred to external buoyancy compensation devices: the buoyancy control device (BCD) or fin, and for drysuit divers, the drysuit itself.<sup><\/sup> These are the only mechanisms available for adding and removing gas to adjust buoyancy. The goal is to move away from instinctive reliance on the lungs and develop a new set of reflexes for micro-corrections using these external tools.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"13_Galvenais_izaicinajums_vairaku_peldspejas_mainigo_lielumu_parvaldisana\"><\/span>1.3 Key challenge: managing multiple buoyancy variables<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The transition to CCR diving introduces a complex, multifaceted control problem that distinguishes it from open circuit buoyancy management. In a traditional OC system, the primary variables are the BCD\/wing, suit compression, and gas consumption. In a CCR environment, the diver must actively manage gas volumes in three separate systems simultaneously: the BCD\/wing, the dry suit (if applicable), and the rebreather&#039;s own breathing circuit.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This multifaceted challenge is why learning CCR buoyancy is a gradual skill. The breathing circuit, although fixed in volume during a single breath cycle, changes volume in response to changes in ambient pressure as the diver descends or ascends, and when the electronic control system adds gas.<sup><\/sup> If the volume of the bow becomes too large, it can create a positive buoyancy vector in the diver&#039;s upper body.<sup><\/sup> This requires the diver to carry more lead to compensate, which in turn requires adding more gas to the BCD or buoyancy aid. The greater the volume of gas in the buoyancy aid, the more sensitive the diver becomes to small changes in depth, increasing the resistance and energy required to float.<sup><\/sup> This interconnected chain of events highlights why proper weighing and dynamic management of all gas volumes are paramount to achieving and maintaining a stable, horizontal position. &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Table 1: Open-Circle vs. Closed-Circle Buoyancy Principles<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td>Aspect<\/td><td>Open Circuit (OC) Scuba<\/td><td>Closed-circuit rebreathers (CCR)<\/td><\/tr><\/thead><tbody><tr><td><strong>Control mechanism<\/strong><\/td><td>Diver&#039;s lungs as a replaceable buoyancy device.<\/td><td>The diver&#039;s lungs are a fixed part of a closed circuit.<\/td><\/tr><tr><td><strong>Primary buoyancy aids<\/strong><\/td><td>BCD\/Wing, dry suit and breath.<\/td><td>BCD\/Wing and dry suit.<\/td><\/tr><tr><td><strong>Gas consumption<\/strong><\/td><td>High; causes significant buoyancy shift as tank pressure decreases.<\/td><td>Low; creates minimal buoyancy shift throughout the dive.<\/td><\/tr><tr><td><strong>Sound feedback<\/strong><\/td><td>Loud gas discharge and regulator noise.<\/td><td>Almost silent operation.<\/td><\/tr><tr><td><strong>Fine-tuning buoyancy<\/strong><\/td><td>Precisely adjusts by adjusting lung volume.<\/td><td>Precisely adjusts by making minute adjustments to the wing or drysuit.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Export to Spreadsheets<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Peldspejas_un_trima_pamatprincipi_uz_JJ-CCR\"><\/span>2. Basic principles of buoyancy and trim on JJ-CCR<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"21_Peldspejas_fizika_Arhimeda_princips_slegta_loka\"><\/span>2.1. Physics of Buoyancy: Archimedes&#039; Principle in a Closed Loop<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The principles of buoyancy are governed by Archimedes&#039; principle, which states that an object immersed in a liquid is subjected to an upward buoyant force equal to the weight of the liquid it displaces.<sup><\/sup> For a diver, neutral buoyancy is achieved when the combined weight of the diver and all of his equipment is exactly balanced by the buoyant force of the displaced water.<sup><\/sup> While this principle remains the same, its application to CCR divers differs. The total weight of a CCR diver includes not only his body and protective suit, but also the weight of the rebreather equipment, scrubber material, and the diluent and oxygen cylinders on board.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Another key factor is the density of the diving environment. Salt water is approximately 3% denser than fresh water, meaning it provides greater buoyancy for the same displaced volume.<sup><\/sup> A diver who is ideally weighted for a freshwater lake will find that he is positively buoyant in the ocean and must add ballast to compensate.<sup><\/sup> General recommendations suggest adding approximately 3-4 pounds (2 kg) of weight when switching from freshwater to saltwater, but proper buoyancy testing is always necessary to confirm the ideal weighting for your specific environment and equipment configuration.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"22_Pareizas_sversanas_kritiska_nozime\"><\/span>2.2 The critical importance of correct weighing<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Proper weighting is the foundation upon which all improved buoyancy control is based.<sup><\/sup> A common and critical mistake for divers, both OC and CCR, is overshoot.<sup><\/sup> The negative effects of being overweight are numerous and cascading. A diver who is too heavy must add a significant volume of gas to his BCD or buoyancy compensator to become neutrally buoyant.<sup><\/sup> This large volume of compressible gas makes the diver&#039;s buoyancy very unstable; even small changes in depth will result in large changes in gas volume and therefore a significant shift in buoyancy. &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In addition to instability, an over-inflated wing increases the diver&#039;s drag profile, forcing him to exert more effort to move through the water.<sup><\/sup> This increased physical exertion can increase metabolic rate and carbon dioxide production, which is counterproductive for a rebreather diver.<sup><\/sup> Overweight also contributes to poor trim, causing the diver&#039;s hips and feet to sink and pushing them into a &quot;seahorse&quot; or head-up position to compensate.<sup><\/sup> The solution is to perform a proper pre-dive weight check, ensuring that the diver can maintain his position at shallow depths (e.g. 10 feet \/ 3 meters) with a nearly empty wing and at the end of the dive when his cylinders are nearing depletion.<sup><\/sup> On CCR, buoyancy shift is minimal due to low gas consumption, which simplifies the weighing process compared to OC diving, where tank depletion significantly changes buoyancy.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"23_Trima_loma_racionalizacija_un_stabilitate\"><\/span>2.3. The role of the tree: rationalization and stability<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Trim is the horizontal body position of a diver in the water, and it is as important as neutral buoyancy for efficient and effortless diving.<sup><\/sup> The JJ-CCR, as a rear-mounted unit, promotes a horizontal orientation, similar to backplate and wing configurations.<sup><\/sup> Achieving perfect trim turns the diver into a stable, streamlined \u201cplatform,\u201d reducing water resistance and protecting the environment from fin contact with the bottom.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Proper posture includes several key elements: keeping your head back and eyes forward, opening your chest and arching your lower back, and raising your knees to a 90-degree angle, in line with your torso.<sup><\/sup> This stance is essential to creating a streamlined profile and is often supported by proper weight distribution, such as the use of a stainless steel back plate, steel rigging, and\/or keel or trim weights to balance the system.<sup><\/sup> The next step is learning propulsion. Although the open-loop (flutter) kick is taught in introductory courses, it can disrupt trim by lifting the diver&#039;s feet.<sup><\/sup> Expert divers use kicks that maintain a horizontal position, such as the frog kick, modified flutter kick, and helicopter turn, which allow rotation without breaking the trim.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_JJ-CCR_iekartas_loma_peldspejas_kontrole\"><\/span>3. The role of the JJ-CCR device in buoyancy control<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"31_Elposanas_loks_un_pretplausas\"><\/span>3.1. Respiratory circuit and counterlungs<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">The breathing circuit, which includes the mouthpiece, hoses, and counterlung, is a critical component in buoyancy management with CCR. The ideal volume of gas in the circuit is known as the \u201cminimum circuit volume,\u201d which is sufficient for a single, comfortable breath.<sup><\/sup> An overfilled bow introduces unnecessary positive buoyancy in the upper body, especially with over-the-shoulder anti-lung designs like the JJ-CCR, making it difficult to maintain horizontal trim and requiring more ballast.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The relationship between buoyancy and gas management in an electronically controlled rebreather (eCCR) such as the JJ-CCR is a complex, interdependent system. The ECCR automatically injects oxygen into the breathing circuit via a solenoid to maintain a precise oxygen partial pressure (<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PO2\u200b\u200b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">).<sup><\/sup> This addition of gas, while essential for sustaining life, directly affects the volume of the bubble and therefore the diver&#039;s buoyancy. A critical element of mastery is anticipating these changes. For example, as a diver ascends, Boyle&#039;s law dictates that the gas in the bubble will expand, increasing buoyancy.<sup><\/sup> At the same time, due to the decrease in ambient pressure &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PO2\u200b\u200b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">decreases, causing the solenoid to add more oxygen to restore the set point. This creates a compound effect in which both the expansion of the gas and the injection of new gas increase buoyancy.<sup><\/sup> An expert diver anticipates this and proactively releases gas from the buoyancy compensator to prevent an uncontrolled ascent, demonstrating that an expert&#039;s buoyancy control is a function of proactive gas management, not a reactive correction.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"32_Sausais_terps_un_sparns_primarie_peldspejas_riki\"><\/span>3.2 Drysuit and Wing: Primary Buoyancy Aids<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Since the diver&#039;s lungs and breathing circuit provide a fixed volume system, the BCD\/wing and drysuit become the primary and often only tools for buoyancy management.<sup><\/sup> The wing should be used for all major buoyancy adjustments, such as when descending, ascending, or moving to a different depth range.<sup><\/sup> A properly balanced diver requires only minimal inflation of the wing to maintain neutral buoyancy, leaving its capacity available for significant changes. &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For drysuit divers, the drysuit inflation system is a critical component for buoyancy and trim control.<sup><\/sup> Gas is added to the suit during descent to prevent \u201cpressure\u201d as the suit compresses under increasing pressure.<sup><\/sup> The drysuit can also be used for small, subtle buoyancy adjustments in conjunction with or even instead of a wingsuit.<sup><\/sup> Gas can be moved inside the suit to adjust the trim; for example, a diver can move a small amount of gas to the shoulders or boots to counteract a head- or feet-down position.<sup><\/sup> This ability makes the drysuit an indispensable tool for achieving finely tuned control and stable trim.<sup><\/sup> &nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Cels_uz_meistaribu_progresivi_peldspejas_un_trima_vingrinajumi\"><\/span>4. The Path to Mastery: Advanced Buoyancy and Trimming Exercises<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Learning buoyancy with the JJ-CCR is a gradual process that requires a structured training regimen and dedicated practice. Such exercises are designed to help the diver move from basic competence to a state of instinctive, effortless control.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"41_1_faze_pamatvingrinajumi_sakotneja_prakse\"><\/span>4.1. Phase 1: Basic exercises (initial practice)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Purpose:<\/strong> Deliberately break old open-circuit diving habits and create a new mental model for buoyancy.<\/li>\n\n\n\n<li><strong>Exercise: Stationary Swimming (Hover):<\/strong> This is the foundation of all rebreather buoyancy exercises. The diver enters the water, deflates his fins, and ensures that the breathing bags are flat. At a shallow, constant depth, he assumes a proper trim and swims still, focusing on relaxed, mid-range breathing without any arm or fin action. The goal is to hold the position for at least five minutes without any change in depth. This exercise immediately diagnoses proper buoyancy and forces the diver to rely solely on his gas management systems for stability. &nbsp;<\/li>\n\n\n\n<li><strong>Exercise: Controlled descent and takeoff:<\/strong> The diver practices a slow, controlled descent to the target depth, stopping at an intermediate depth of 6 meters to perform an equipment and buddy check. During the descent, he must add diluent to the circuit through a manual addition valve (MAV) or automatic diluent valve (ADV) to prevent volume loss and maintain buoyancy. During the ascent, he practices releasing small amounts of gas from the wing and drysuit to control the expansion of the gas as the ambient pressure decreases. This exercise reinforces the need for small, subtle adjustments to buoyancy devices. &nbsp;<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"42_2_faze_videja_limena_vingrinajumi_kompleksitates_un_kontroles_pievienosana\"><\/span>4.2. Phase 2: Intermediate exercises (adding complexity and control)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Purpose:<\/strong> Integrate stable buoyancy control with other critical diving skills.<\/li>\n\n\n\n<li><strong>Exercise: Static swimming with skill practice:<\/strong> While maintaining perfect stationary swimming and trim, the diver practices other essential skills, such as mask clearing, valve closing, or coil deployment. The goal is to complete the skill sequence without any change in depth or body position, demonstrating that the basic skills can be performed flawlessly even when the diver&#039;s attention is divided. &nbsp;<\/li>\n\n\n\n<li><strong>Exercise: Maintaining precise depth:<\/strong> The diver swims a long, horizontal transect, attempting to stay within a narrow depth band of +\/- 1 meter or less. This exercise trains the diver to make constant, almost imperceptible adjustments to the fin or drysuit, developing the \u201cfineness\u201d that characterizes expert buoyancy control. The goal is to eliminate the \u201cunnecessary up and down movements\u201d that are common in new CCR divers. &nbsp;<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"43_3_faze_uzlaboti_vingrinajumi_instinktiva_kontrole\"><\/span>4.3. Phase 3: Advanced Exercises (Instinctive Control)<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Purpose:<\/strong> To achieve the \u201cmuscle memory\u201d and anticipatory control that a master diver possesses, allowing him to react flawlessly to unexpected events and environmental changes. &nbsp;<\/li>\n\n\n\n<li><strong>Exercise: Buoyancy during simulated emergency procedures:<\/strong> A diver practices buoyancy management by performing high-stress emergency exercises. This includes a complete diluent flush, an emergency procedure, or a flooded circuit recovery. For example, during a diluent flush, the diver intentionally inhales diluent and exhales gas through his nose to reduce the PO2 in the circuit. He then observes the resulting buoyancy change and compensates with his BCD or dry suit. This trains the diver to manage the combined effects of gas management and buoyancy under stress. &nbsp;<\/li>\n\n\n\n<li><strong>Exercise: buoyancy during takeoff:<\/strong> The diver practices controlled ascent by managing the expansion of gas in the wing, drysuit, and bow. He learns to anticipate the action of the solenoid on the eCCR and proactively vent gas from the breathing circuit to maintain neutral buoyancy during decompression stops. This anticipatory skill is characteristic of a skilled CCR diver, preventing uncontrolled positive buoyancy that can result from reactive gas venting. &nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Table 2: Buoyancy and trim exercise progression<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td>Phase<\/td><td>Exercise name<\/td><td>The aim<\/td><td>Success criteria<\/td><\/tr><\/thead><tbody><tr><td><strong>Basic<\/strong><\/td><td>Stationary swimming (Hover)<\/td><td>Get rid of OC habits; diagnose weighing.<\/td><td>Swim motionless for 5 minutes at a constant depth (+\/- 1m).<\/td><\/tr><tr><td><\/td><td>Controlled descent and takeoff<\/td><td>Practice fine adjustments to buoyancy devices.<\/td><td>Maintain a slow, constant takeoff\/descent speed without hand movement.<\/td><\/tr><tr><td><strong>Medium level<\/strong><\/td><td>Static swimming with skills<\/td><td>Integrate buoyancy control with basic skills.<\/td><td>Clear the mask or close the valve without depth changes exceeding 1 m.<\/td><\/tr><tr><td><\/td><td>Maintaining precise depth<\/td><td>Develop a \u201cfeel\u201d for small, subtle adjustments.<\/td><td>Swim a 15-meter transect, staying within a 1-meter depth range.<\/td><\/tr><tr><td><strong>Advanced level<\/strong><\/td><td>Buoyancy with emergency exercises<\/td><td>Learn to control multiple variables under stress.<\/td><td>Perform a complete diluent flush or emergency procedure without significant buoyancy change.<\/td><\/tr><tr><td><\/td><td>Scheduled takeoff<\/td><td>Learn proactive gas management during takeoff.<\/td><td>Maintain neutral buoyancy at the decompression stop by controlling solenoid actuation.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Export to Spreadsheets<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Biezi_sastopamu_peldspejas_problemu_risinasana_ar_JJ-CCR\"><\/span>5. Solving common buoyancy problems with JJ-CCR<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"51_%E2%80%9CPorpoising%E2%80%9D_un_nestabila_kustiba\"><\/span>5.1. Porpoising and unstable movement<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Symptoms:<\/strong> Uncontrolled up and down movements, difficulty maintaining a constant depth. &nbsp;<\/li>\n\n\n\n<li><strong>Main causes:<\/strong> This problem is almost always a symptom of overinflating, which causes the diver to overinflate his wing. The large volume of gas in the wing makes the diver&#039;s buoyancy very sensitive to small changes in depth. In addition, the OC&#039;s habit of using large inflator button presses rather than small, short gas bursts can lead to overcorrection and unstable movements. &nbsp;<\/li>\n\n\n\n<li><strong>Solutions:<\/strong> The main solution is to remove the weight. Proper weight checking at the end of the dive is the most accurate way to determine the correct amount of ballast. Once the weight is properly adjusted, the diver should practice very small, sub-second inflations and deflations to make minute adjustments. &nbsp;<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"52_Netisas_peldspejas_nobides\"><\/span>5.2. Unintentional buoyancy shifts<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Symptoms:<\/strong> Becoming unexpectedly buoyant during takeoff or decompression stops, often incorrectly attributed to gas consumption. &nbsp;<\/li>\n\n\n\n<li><strong>Main causes:<\/strong> Unlike open circuit diving, where tank depletion causes a significant buoyancy shift, CCRs use minimal gas, so this is rarely the case. The main causes of unintentional positive buoyancy on a CCR are gas expansion from ascent and automatic oxygen injection from a solenoid. As ambient pressure decreases, the gas in the circuit expands, and the eCCR adds more gas to maintain the set PO2, creating a compounded buoyancy increase. Overfilling the breathing circuit due to a high breathing rate or an overexerted diver can also contribute to this problem. A more subtle, often overlooked cause is the release of inert gases during long decompression ascents, which can cause the diver&#039;s total volume to increase, adding to his buoyancy. &nbsp;<\/li>\n\n\n\n<li><strong>Solutions:<\/strong> A master diver anticipates these changes rather than reacting to them. During ascent, the diver should proactively vent gas from the breathing circuit and BCD to counteract the effects of expansion and gas injection. This can be done by venting gas through the nose, especially during decompression stops, to manage the circuit volume and prevent the solenoid from overfilling the system. &nbsp;<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Table 3: Common buoyancy problems and solutions<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><td>Symptom<\/td><td>Main causes<\/td><td>Solutions<\/td><\/tr><\/thead><tbody><tr><td><strong>Porpoising\/Unsteady movement<\/strong><\/td><td>Predominance; reliance on high inflator flow rates; OC habits.<\/td><td>Reduce weight by performing a weight check at the end of the dive; practice small, frequent inflator flows.<\/td><\/tr><tr><td><strong>Foot down three<\/strong><\/td><td>Improper weight distribution (e.g. too much weight on the belt).<\/td><td>Move the weight higher on the body using a steel back plate or trim weights.<\/td><\/tr><tr><td><strong>Unintentional buoyancy shifts<\/strong><\/td><td>Gas release during takeoff; overfilling of solenoid; excess arc volume.<\/td><td>Anticipate changes and proactively release gas from the rim and BCD.<\/td><\/tr><tr><td><strong>Difficulty swimming<\/strong><\/td><td>Overweight; incorrect trim; ineffective use of fins.<\/td><td>Perform a weight check; adjust trim; practice frog kicks and helicopter turns.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Export to Spreadsheets<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_Drosiba_pirmaja_vieta_Peldspejas_kontrole_konteksta\"><\/span>6. Safety First: Buoyancy Control in Context<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Learning buoyancy isn&#039;t just about comfort or style; it&#039;s a fundamental pillar of diving safety. Lack of buoyancy control is a major factor in diving injuries, including uncontrolled ascents, which can lead to life-threatening conditions such as pulmonary barotrauma and arterial gas embolism.<sup><\/sup> It also increases the risk of accidental contact with fragile marine life or geological formations.<sup><\/sup> A skilled diver can effortlessly adjust their position, avoiding unintentional interactions with their environment. &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The JJ-CCR, like all rebreathers, is a complex piece of life support equipment. For this reason, the manufacturer and training agencies clearly state that the equipment should never be used without specific, equipment-specific training from a qualified instructor.<sup><\/sup> The training teaches not only operational aspects but also safety-critical skills needed to manage the unique challenges of CCR diving. &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A central element in this training is the use of the autonomous emergency system, which is essential in every niren, as there is a possibility that the equipment may fail.<sup><\/sup> Buoyancy control is a key skill during an emergency scenario. A master diver practices emergency procedures in a controlled manner, learning to simultaneously manage his ascent and gas supply.<sup><\/sup> This ensures that even in an emergency situation, the diver can complete the dive safely and in a controlled manner, without risking an uncontrolled ascent. &nbsp;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"7_Secinajums_Bez_piepules_nirsanas_maksla_un_zinatne\"><\/span>7. Conclusion: The Art and Science of Effortless Diving<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Learning buoyancy with JJ-CCR is a journey in which deeply ingrained skills are replaced with a new, precise, conscious set of skills. It is not an instant transformation, but a process that requires dozens of hours of dedicated practice for many divers to reach a level of unconscious competence where buoyancy control becomes second nature.<sup><\/sup> The most effective divers are those who approach this process with patience, a commitment to consistent practice, and careful focus on the fundamentals of proper weighting and trim. &nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The reward for this dedication is diving that is not only safer, but also more serene and inclusive. By eliminating the bubble flow and noise associated with open-circuit scuba, the CCR diver can get closer to marine life, explore shipwrecks and caves with minimal disturbance, and enjoy extended bottom time that was previously unattainable. In the hands of a master, the JJ-CCR becomes an extension of the diver, allowing him to move through the water with unparalleled grace and efficiency, transforming diving into an art form. The path to mastery is well-defined and begins with the recognition of a paradigm shift, followed by structured, progressive training to build and refine the skills of an expert-level rebreather diver.<\/p>","protected":false},"excerpt":{"rendered":"<p>Learning buoyancy with a closed-circuit rebreather (CCR) is a significant and necessary paradigm shift for divers transitioning from open-circuit (OC) systems. The key difference is that the CCR breathing circuit is of fixed volume, which makes the traditional OC technique of using lung volume [\u2026]<\/p>","protected":false},"author":168,"featured_media":11233,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1600],"tags":[],"class_list":["post-11106","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tehniska-nirsana"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Peldsp\u0113jas apm\u0101c\u012bba un apguve ar JJ-CCR rebr\u012bderi - Daivings.lv<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/daivings.lv\/en\/swimming-training-and-learning-with-a-jj-ccr-rebreather\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Peldsp\u0113jas apm\u0101c\u012bba un apguve ar JJ-CCR rebr\u012bderi - Daivings.lv\" \/>\n<meta property=\"og:description\" content=\"Peldsp\u0113jas apguve ar sl\u0113gt\u0101 loka rebreatheru (CCR) ir noz\u012bm\u012bga un nepiecie\u0161ama paradigmas mai\u0146a nir\u0113jiem, kuri p\u0101riet no atv\u0113rt\u0101 loka (OC) sist\u0113m\u0101m. 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