Dual vs Single bladder wings

[pieater]

Originally Posted by TerryH

If you make it a surface only effort then how do you stop anyone using it U/W, plus surely if this can also aid an ascent it should do both.

You're right, you can't stop someone using it at depth. That's why this isn't the best idea. If the average diver (and I am one) straps 6Kg of bouyancy at themselves at 30M (starting from a position of being correctly weighted) I bet they clear the water surface 20 seconds later with enough room to land on the boat deck.

[TerryH]

Originally Posted by pieater

You're right, you can't stop someone using it at depth. That's why this isn't the best idea. If the average diver (and I am one) straps 6Kg of bouyancy at themselves at 30M (starting from a position of being correctly weighted) I bet they clear the water surface 20 seconds later with enough room to land on the boat deck.

Cough.

Original horse collar type vests had one shot CO2 cartridge.

Later the Fenzy and La Spirotechnique type of ABLJ went from bottle
to direct feed. The Buddy ABLJ had both and was fired using a bottle
that could be cracked open to initiate the ascent.

Later the same bottle was added to the Commando range and again
was used as an alternate method of ascent.

Problem with all this wasnt the principle, but the actual size of bladder
and the potential to overinflate. Crack it too much and the bladder would
cause a rapid, reduce the size of the bladder and even if you did push it,
ascent could be stopped by dumping air.

If I can buy a massive range of wings that will carry from 8-50kg
I'm damn sure a manufactuer can have a range of bladders from 4-10kg.

This is only a new application of a proven technology, but paying attention
to one of the drawbacks.

[pieater]

Originally Posted by TerryH

Cough.

Original horse collar type vests had one shot CO2 cartridge.

Oh well, that's all right then, 'cos diving was safe-as-houses in those days wasn't it? Why don't we go back to attacking Calor gas fittings with files as well?

"Back in the day" I'll also bet you'd find:
1, Divers were correctly weighted more often;
2, The average diver was fitter;
3, The average UK dive was to much shallower depths.

[TerryH]

Originally Posted by pieater

Oh well, that's all right then, 'cos diving was safe-as-houses in those days wasn't it? Why don't we go back to attacking Calor gas fittings with files as well?

Just because it's old, doesnt mean we cant reinvent it. Rebreather anyone?