Calculating required Wing Lift

[Fiona]

Originally Posted by Lou

Go for 100lb wing, just to be sure

Oi that was going to be my line you can never have too much lift

[gibbon]

Originally Posted by Lou

OK, only joking. Go for 232 12's, not 300 10's, and a 40-50lb wing.

It must be hard to belive that people are telling you to get an old standard for cylinder pressure when there is newer and better available...

I am sure that if I were learning to dive now I would make the same mistake and insist that 300BAR cylinders were obviously superior even if you dont get the full 1/3 extra gas.

My cousins 300BAR cylinders were available a short time ago on ebay because they were just too heavy for him - I did tell him and I did chuckle when he finally dived with them and accepted it.

WRT wing size, I have 2 wings, a 30lbs and a 50lbs - the 50 has not been used in a long time and I stuggle to understand why I would need the extra lift. I always have a redundant form of bouyancy with me, and would love to hear a justification (kit configuration) that is realistic for which I would need more lift...anyone?

I think that Phil nailed it earlier with the suggestion for a 40lbs wing.

[RichW]

Originally Posted by Fiona

Oi that was going to be my line you can never have too much lift

Trim and drag issues aside, it is possible to have too much lift.

If we go back to the recent discussions about wayward wing inflator units, I would rather have a wing that inflated to 40lb and then triggered the OPV, than one that kept on inflating to 100lb.

It's much more difficult to deal with a rapid 100lb of positive buoyancy than 40lbs of the same. Before this all kicks off, I'm not suggesting that dealing with 40lb is easy, but it's got to be easier than 100

Rich

[Fiona]

Originally Posted by jonny

It must be hard to belive that people are telling you to get an old standard for cylinder pressure when there is newer and better available...
I am sure that if I were learning to dive now I would make the same mistake and insist that 300BAR cylinders were obviously superior even if you dont get the full 1/3 extra gas.

[Lou]

Originally Posted by jonny

WRT wing size, I have 2 wings, a 30lbs and a 50lbs - the 50 has not been used in a long time and I stuggle to understand why I would need the extra lift. I always have a redundant form of bouyancy with me, and would love to hear a justification (kit configuration) that is realistic for which I would need more lift...anyone?

I think that Phil nailed it earlier with the suggestion for a 40lbs wing.

I think it depends on the shape of the wing. The only time I need all the lift is on the surface, but if half the lift is behind my head that doesn't help much in this position.

So, a wing with lots of the available lift lower down needs less capacity than one that has more cell behind the head to help with trimming out tanks, for example.

My 36-37lb wing was just a little on the low side in a chop. My Dive-Rite Classic, which is more like 50lb is fine, and not too flappy either, unlike the 55lb Explorers.

[Okeanos]

With twin 12's & 2 steel stages and all the other crap I don't put air in my wing, only at the surface. As a redundant buoyancy system it would only have to be the a little more than my drysuit requires. 40lb would be plenty for me, thats 18 litres of air, which will lift 17kg of negative buoyancy. If you are 17kg negative you either have $hit loads of gear or seriously overweighted.

Not sure why anyone would want 100lb lift, unless they wanted to sail it!

[Steve Jones]

Originally Posted by Silly Car

Is there any way that I can calculate the required lift needed for a wing, and what levels of safety margin would you suggest in excess of a calculated figure.

Thanks

What you really need is a Dive Rite Super Wing with double bladder. Come to think of it I have one at home.

Steve

[Fiona]

Originally Posted by RichW

Trim and drag issues aside, it is possible to have too much lift.

Rich

:suitably chastised:

I was joking

[milldog]

Originally Posted by Fiona

you can never have too much lift

buy a better bra then

seriously though i have the evo 40 with SS back plate for my twin 12's / 300 bar and two AL80 stages 4kg of lead Hammer crowbar and i have more than enough lift with it.

Graham

[milldog]

Originally Posted by Steve Jones

What you really need is a Dive Rite Super Wing with double bladder. Come to think of it I have one at home.

Steve

can i have it for my twin 20's