Has Anyone Tried This BP/W From Dive Gear Express?

[seeker242]

is there another source you can point me too for figuring out how much lift I need?

Wing Lift Capacity

Pretty cool calculator thing .

 

[stuartv]

How much lead do you need to sink your 7mm? -- that's [upper limit on] how much lift you'll need at depth when the suit compresses and loses buoyancy.

The upper limit is the amount of buoyancy lost to suit compression PLUS the weight of the gas he is carrying.

With an HP100 holding about 8 pounds of gas, if the suit loses 10# from compression, he would need 18 pounds of lift. If the suit loses 20# of compression, he would need 28 pounds of lift.

The key is figuring out how buoyant the suit is. From there, it seems pretty common to assume a loss of somewhere around 75% of buoyancy due to compression at the deepest recreational depths (130' or 40m).

It also seems to be pretty commonly accepted to allow 2 or 3 # for "margin". So, if the suit loses 10# and the gas is 8#, then you might want a wing with 21# of lift or so. And maybe even allow for losing a little more than 75% of suit buoyancy, for a little extra margin of safety.