Wing Lift Vs Depth vs Amount of Bottles

[Remy B.]

Ok so I understood wrong, thanks for clarification.

I'm guessing or assuming which normally is not the right thing to do, but all of you are using 45Lb+ wings or if you were using a 35lb wing that will as well do the job ??, for what reason they offer the different variety of wings sizes ??

thanks for your inputs.

 

[PfcAJ]

Wing needs to float your gear (full tanks) without you in it. This does not include stages.

 

[Nasser]

Wing needs to float your gear (full tanks) without you in it. This does not include stages.

Yes indeed... thanks for adding the clarification.

 

[Remy B.]

Wing needs to float your gear (full tanks) without you in it. This does not include stages.

understand better now with this statement and the one from Mr. Lewis.

in which technical course do you get to calculate waits according to gas content of your tanks ??, or will this be addressed in the gas blender and advance gas blender specialties, together with the manufacture information of the weight of the bottle in the salt water, and buoyancy courses and with the combination of all these information you get to know the exact lift required ??

 

[tbone1004]

your mix course may go over it, but I've only ever calculated lift requirements from backgas bottles assuming air. Any helium is a perk.

You don't really need to, but if you want you can calculate the volume of each of the three gasses in your tank, multiple each volume by the weight per unit volume of each gas, and calculate it out, but you're splitting hairs.

 

[PfcAJ]

You need to dive a balanced rig. Weighting requirements are dependent on tanks (backgas tanks), body composition, suit type, insulation.

This stuff is day 1 type activities in a GUE fundamentals class.

 

[StefinSB]

understand better now with this statement and the one from Mr. Lewis.

in which technical course do you get to calculate waits according to gas content of your tanks ??, or will this be addressed in the gas blender and advance gas blender specialties, together with the manufacture information of the weight of the bottle in the salt water, and buoyancy courses and with the combination of all these information you get to know the exact lift required ??

You already know the ideal gas law from your OW/AOW classes. You can find the molecular weights/densities of various gases here: Molecular Weight - Gases and Vapors. If using molecular weights you will need the ideal gas law: pV = nRT (with n being the number of moles of gas being n=mass/molecular weight). You know pressure p, tank volume V, gas constant R, and temperature T. Multiply by g and you got weight.

 

[dumpsterDiver]

You are wrong. At depths that divers operate at the increased density of the inflation gas is trivial, the density of the water is unchanged wrt to depth until you get sea trench deep.

Many of your other assumptions are wrong too, but this is particularly glaring.



Tobin

I was amazed that so many other people just ignored this extremely conspicuous misconception. This misconception is the basis of his question, yet everyone else seemed to ignore it.

How does someone consider pursuing technical diving without the most rudimentary understanding of the gas laws.. it is scary, but I guess it is better that he asked and got a good answer.

 

[Remy B.]

[FONT=Conv_MyriadPro-Regular]Here are some points that were mention in a deep diving course online I did two days ago, and it confused me as it does not go in detail of their statement, of course it is not a technical diving course and I was sure on this section of SB it was going to be clarified.

The next piece of equipment that is important for deep diving is the buoyancy control system or buoyancy compensator. Be sure that the one you select provides enough lift to bring you and another diver to the surface from depth.

[/FONT][FONT=Conv_MyriadPro-Regular]The deeper you dive, the more critical your equipment is. It is recommended that a buoyancy control system should have adequate lift (15-25kg at sea level),
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It confuses more when you read in the manufacture sites about BCD sizes, if I'm "M" size it will not come with a 45lb bladder I will need to buy a "L" with this statement it appear that is man size related not amount of gear related.

[/FONT]

• 35 lbs bladder S & M sizes / 45 lbs bladder L & XL sizes

 

[PfcAJ]

BCs that come in S,M,L,XL are not appropriate for technical diving.

Wings are modular and you just get the one with the right amount of lift based on what we've said earlier in this thread.