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Need Tips on Buoyancy
Vikas - 4/16/2007 4:09 AM
Category: General
Replies: 8

I have just started diving and enjoying it to the fullest. last week end I had gone on a deep and wreck dive, I had a major issue with my Buoyancy, First I had difficulty descending, even though my BCD was deflated, all was fine till we started our ascent, suddenly at 28 meters i started just rocketing up in a few seconds to 18 meters. Yes I did release air from my BCD on starting my ascent. Can any one recommend some Buoyancy tips.
Vikas - 4/16/2007 6:15 AM
Thanks for the tip Stephan, I use a Standard waist nylon weight belt with a quick release stainless steel buckle. I weigh 87 kg, on my Peak Performance Buoyancy course i dived with 6kg and my instructor bought it down to to 4kg. Thats the weight i had when i did the wreck dive. On my second dive i had 4 kgs on the belt and 1 kg on the BCD. I had a problem again. I have enrolled for my speciality in P.P.B for this week. Any more info will be welcome- Vikas
Dorkfish - 4/16/2007 9:54 AM
Also, remember that any minor equipment changes can make a huge difference in bouyancy/weighting needs. For example: if you were diving in a specific brand of suit in say 3mm, but dove the same thickness in a different suit your bouyancy could be affected. Granted it`s the same thickness, but it does happen.

The same goes for tank types. Say if you used a Luxfer S80 aluminmum and changed to a N80 aluminum, you would need less weight due to the N80 being a bit negative. The same can be said going from brand to brand in a specific model of aluminum or even steel tanks, though the tanks are the same, their bouyancy may be just a bit different.

I`ll give you a better example: I own 2 Luxfer S80 alums and 2 Catalina in the same model. When filled to identical psi, the tanks differ in weight on a digital scale; sometimes by 1/2 pound to 1 pound.
dd_diver - 4/16/2007 10:56 AM
Here`s a good article on buoyancy... If you can, check out thr proper weighting in a pool with the same gear. Try it with an empty tank, so you know what you need for weight at the END of the dive. Too many times we get lazy and do a weight check with a full tank!!
Vikas - 4/16/2007 1:42 PM
Thanks for the info dd_diver & diverdwon247. I have not invested on a tank yet, tell me guys if on accidental fast ascent, what measures can we take to control the same, can we do a flip over with our legs facing the top and head down to the sea bottom and start swimming down but that will bring me back to where i began. Vikas
bpsf1 - 4/17/2007 6:44 AM
There is also much to be said about practice. Take what you`ve learned and apply in a pool situation as much as possible. Please see my "Air-coholic" post. That was an effort to get people communicating about bouyancy and air consumption. When I was certified I sucked 2900 psi in about 50 minutes. Over the course of the next several weeks, I practiced bouyancy a minimum of 8 hours. Last Sunday I managed to stay submerged for 90 minutes on 2940 psi and had just under 1000 psi left in the tank. It was a simple matter of breathe and bouyancy control. Practice your fin pivot and focus on relaxation. Once you have achieved a basic level of neutral bouyancy, your breathing can do the rest. I noticed that with shallow breathing came less dramatic changes in bouyancy. Now, I can hover face up at depth as long as my air supply will permit. It was an amazing breakthrough for me.
Greg - 4/18/2007 1:21 PM
The exposure suit you wear makes a big difference also. If you`re wearing a really thick wetsuit, you will either have to wear a lot of weight to get down initially, then by overweight for most of the dive...OR...wear just enough weight and plan on pulling yourself down past the first 15 feet or so until the wetsuit compresses and looses some buoyancy.

Also, when trying to swim in a neutral need to be as close to neutrally buoyant as possible, then kicking forward with your body leaning down (head lower than feet) will help to keep you underwater. A lot of divers have a tendancy to kick upward which pushes them out of the water.
NWKatShark - 5/02/2007 6:25 PM
My first thought was "relax". You stated you`ve just started diving AND you went on a deep dive. I`m sure you were nervous and apprehensive, that`s normal. Talk to your Instructor. Granted, there are a lot of other possible contributing factors. Same BC? Wet/Drysuit? Salt/freshwater? Depth? Visibility? How did you feel before/during the dive? Etc. My biggest question would be: If it`s against the law to drink and drive, why do lounges/pubs/taverns have parking lots?