Does this BC product exist?

[StevenPaulet]

And yeah, I made up the word "D-Blings" back when Sonoform circa mid '90s was hanging metal pull tabs on any BCD that the dive companies wanted, just to make a marketing buck by calling it a technical vest.

 

[MikeFerrara]

4L of air in wings, versus 4 L of air around your body. Yeah, tested that too, but we forced the diver to go through the water at the same angle of attack for comarison. However, if wings are dragging 4L... they are bending the diver or tilting him. Air distributed around the torso keeps the attitude of the diver more consistent... and the numbers of actually testing the diver in true horizontal fashion is more correct. Hence, sure, the ADV type vests are less drag in this scenario, based on a few truisms/perceptions/observations/realities.

Could you explain what you mean by a wing bending or tilting a diver?

 

[ams511]

I like the term "D-Blings", did you think that up yourself?

Edit: That was quick, by the time I posted you answered the question. lol

 

[scubawally]

in all reality we are talking about a problem that either does not exist at all or one that can easily be fixed. All you have to do to keep a bp/wings perpendicilar in the water is to lean your body weight back into the backplate a little bit and you will be fine..... This is assuming of course that you are weighted properly in the first place.

 

[StevenPaulet]

Yeah, this is stupid. Let's talk about something else.

 

[Dave McLean]

NO...I want to continue the discussion!

 

[Dave McLean]

*wakes up...fires up decades old memory*
Angle of attack was/is a very interesting factor in the study...and an unstable angle of attack as a result of shifting of the BC air bubble, or a drysuit air bubble, or lung volume variability, could result in osciillations that changed the angle of attack and affected drag. Placement of the air bubble close to the center of mass so that the moment arm between forces is small,contrinbutes to swimming instability as well. These two factors create a dynamic state that *anecdotally* varies greatly. Eliminating this dynamic state from the drag work that was done was really valuable in isolating the form drag contribution, but that is about it. I won't go into which style is better, as there are waaaay too many variables.
And as I recall it...Soniform was making the DiveRite TransPac to Soniform Patents, the OMS BCs, the Poseidon units, doing dev. work for Draeger, so there was righteous tech BC production among the Sport BIU production. I can't say how many people hung stages or anything else on their shoulder D-rings. All I can say is that they were there, and they were engineered to carry what they needed to.... =D

History of BCs is STILL at: http://mckclan.net/BC.htm

You owe me lunch by the way...and Kathy says hi.

 

[StevenPaulet]

Ok, it's NOT stupid. But academic, and I was thinking... isn't that the same thing?

Lunch sounds good. But tell me you still live in the Rockies? Last I figured, you'd be back in Guacamole land putting limes in beers or something like that! LOL.

Give Kathy a hug, she always did like me best!

 

[Lucy's Diver]

Oceanic is working on a hybrid that flows air to a vest type configuration on the surface and, when you fin yourself into a horizontal position, to modified wings on the back. Apparently they are shipping a female only version of the BC now and a male version shortly. A rep showed me the actual BC awhile ago. This is not the Excursion.

 

[diveasr]

its called the outrigger and has a front bladder wich you inflate by leaning back on the wing