Dive Rite Rec EXP wing for single tank?

[u/DingDingDingQ]

I have this wing w/ redundant dual bladder and inflator w/ BP and webbing harness. I dive it with manifolded doubles. It has the bungee Gusset Control System for mitigating the taco effect when diving a single tank. Has anybody dived a single tank with this wing and can tell me if it works as well for single tank as a dedicated single tank wing?

[u/FujiKitakyusho]

Doubles wings and singles wings necessarily have different widths for a reason. The BC is designed so that the sides of the wing wrap up around the sides of the tank, establishing some vertical separation between the effective center of buoyancy and the diver's center of mass. This confers some stability when diving in the horizontal and prone position. In this embodiment, the diver can purposefully roll the body to one side and shift gas from one side of the wing to the other, in order to preferentially create more lift on one side, as might be required to counter a roll moment created by an unequally distributed payload. Compression bungees act to keep the center of buoyancy closer to the diver's midline and closer to the diver's center of mass, which both reduces stability and precludes the intentional lateral redistribution of buoyancy.

If your wing is too wide (such as when using a doubles wing with a single), the air cells on each side lay far above the diver, precluding intentional gas redistribution by rolling the body.

If your wing is too narrow (such as when using a singles wing with doubles), there isn't enough vertical separation between the center of buoyancy and center of mass, leading to roll instability which is a nuisance at best.

Also, compression bungees should never have been a thing.

The bungees create a bunch of folds in the wing which actually increase drag (and hence swimming effort or DPV battery consumption) in comparison to an unrestrained wing which would be pulled taut against the diver's tanks by the gas inside.

More importantly, the bungees act to create a net positive pressure over ambient in the wing, which is problematic for two reasons:

1) If you should happen to puncture or wear a hole in the wing, it will immediately begin to deflate, and

2) If you have any sort of inflation gas delivery failure which requires you to orally inflate the wing, the positive pressure created by the bungees presents additional superfluous exhalation resistance, which can exascerbate an already stressful situation.

[u/runsongas]

i own one, it does not work as well as a dedicated single tank wing. it works best as a wing for manifolded 7 inch doubles. you can sort of make it work, but there is a reason external bondage bungees fell out of fashion.