Вообще то топикастер не спрашивал, как рассчитать подъемную силу крыла
О рассчетах:
На скубабоард очень часто и терпеливо объясняет всем, как правильно расчитать необходимую подъёмную силу крыла, Тобин - производитель крыльев Deep Sea Supply (DSS).
Для спарки это делается следующим образом (для однобаллоного крыла - несколько иначе):
I have answered this question a few dozen times
I assume you are selecting a wing for doubles and a drysuit.
Your wing needs to meet two criteria, have enough lift to float your rig at the surface without you in it, if you ditch your rig for example, and it needs enough lift to be able to compensate for a total failure of your drysuit, not a flood, but a dry suit that cannot trap any gas.
In doubles and a dry suit you want to start the dive negative by the weight of 100% of your back gas, + 2-3 lbs. That allows you to maintain a shallow stop and breath down your back gas all the way. The extra 2-3 lbs allows you to inflate your suit for warmth.
Let's assume you are using double 130's That's about 22 lbs of gas (air or nitrox, less with mix)
That means you want to be about 24-25 lbs negative at the start of the dive. That means to stay at the surface with just your back gas tanks, you will need to use about 25 lbs of the available lift capacity of your wing.
Now what happens if you suffer a total failure of your dry suit? I'll assume your suit requires 24 lbs of ballast to get neutral with minimum gas in it.
If you have a total failure of your suit you will need another 24 lbs of wing capacity to stay at, or get to the surface. 25 lbs negative + 24 lbs of lost drysuit buoyancy = 49 lbs minimum capacity wing.
Now lets add a
bottle, al 80 full of 50% for example. These are about -4 lbs full, and rigged
Our diver is using about 25 lbs of his 49 lbs capacity wing and NONE of his drysuit (min gas) to stay at the surface. He has 24 lbs in "reserve" I hand him a full
bottle, he now needs to add 4 lbs more gs to his wing, no big deal. 2 al 80 is no big deal, 3 al 80's is still not a problem.
Now what happens if he has a total dry suit failure early in the dive when he still has lots of back gas? Simple, either hand off or ditch the
bottle(s) he does not need to the
gas, he doesn't yet have much of a
obligation.
What if he suffers a total failure of his suit late in the dive? He needs his
gas, it's going to get him out of the water sooner, so he can't ditch it.
He has however used a good portion of his back gas, and so again he will have enough wing to make it back to the surface.
Ditchable bottles are not part of the divers weighting, and do not impact the required wing lift.
If a diver needs to fully inflate their wing if they add a
bottle (or two or three) then their wing was too small to be able to deal with a total failure of their drysuit in the first place.
Tobin
Опыт - это вовсе не то, что с вами под водой случилось.
Опыт - это то, КАК вы с этим справились.