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Author Topic: Back inflated BCD  (Read 3167 times)

xavior

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Back inflated BCD
« on: 29 Mar 16, 10:51 »
Hi Shifus! Got a few questions regarding back inflated bcds!

Recently I went for a diving course to tioman. My BCD was rented and was given the back inflated bcd instead of the regular jacket BCD dive shops tend to give. I had a number of problems using it as it was my first time.

On the trip itself, I had problems descending even thou I was properly weighted. (Note: descending only, had no buoyancy problems after descending). Realized that the air in the bladder was not fully released. Resolved this problem after 2 dives.

Another issue is the crotch strap... How do you guys remove the weight belts with this on?!?! I kept having problems with that. Had to remove the only buckle of the BCD, remove the strap to remove the belt.
Last issue I have is while on surface, even with the crotch strap, the BCD seems to want to go over my shoulders. Other than lying on the BCD, any other way to stay vertical comfortably?

Thanks in advance!

sibingai

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Re: Back inflated BCD
« Reply #1 on: 29 Mar 16, 12:14 »
Im no shifu. But once i passed my OW,i bought a Dive Rite.
My take is,the bc have to be adjusted properly to your fit.when i descend,i "lie"on my back.its faster that way.lolzzzz.
As for ascending...if ur harness is adjusted properly,it should be the same as other bc?. But then again.it depends on comfort. One hv to be comfortable with what type of bc you are comfy with.

snikrs

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Back inflated BCD
« Reply #2 on: 29 Mar 16, 18:30 »
I think you were using a backplate+wing (bpw), since it comes with a crotch strap?

With a bpw, like what sibingai mentioned, it's easier to descend by leaning backwards. Doing that pushes the air from the bottom to the top of the wing where the inflator hose is connected to.

The bpw is never comfortable on the surface, it's made for underwater use. A properly adjusted crotch strap should hold the bpw in place on surface, even though it can be painful on the crotch after spending a long time floating around. If it feel like its going to lift over your shoulders, it's provably a sign the crotch strap is still too long.

With regards to weights using a bpw, if you have only a weight or two, try putting it on your tank strap(s). If you still want a ditchable option, wear the weight belt over the waist belt and crotch strap, after putting on the bpw. It can be quite uncomfortable though.


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« Last Edit: 29 Mar 16, 18:32 by snikrs »

sibingai

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Re: Back inflated BCD
« Reply #3 on: 30 Mar 16, 02:23 »
I personally use an outsourced weight pockets attached to my harness bc. I hate wearing weight belts as it keeps sliding down.

xavior

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Re: Back inflated BCD
« Reply #4 on: 30 Mar 16, 11:24 »
I think you were using a backplate+wing (bpw), since it comes with a crotch strap?

With a bpw, like what sibingai mentioned, it's easier to descend by leaning backwards. Doing that pushes the air from the bottom to the top of the wing where the inflator hose is connected to.

The bpw is never comfortable on the surface, it's made for underwater use. A properly adjusted crotch strap should hold the bpw in place on surface, even though it can be painful on the crotch after spending a long time floating around. If it feel like its going to lift over your shoulders, it's provably a sign the crotch strap is still too long.

With regards to weights using a bpw, if you have only a weight or two, try putting it on your tank strap(s). If you still want a ditchable option, wear the weight belt over the waist belt and crotch strap, after putting on the bpw. It can be quite uncomfortable though.


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I sort of solved the descending issue by leaning towards my left, making my right side higher where the hose is.
I know with the crotch strap, it's never going to be comfortable. (I can make do with it, hopefully I dont get crushed balls) It's just that I kept having problems with removing my weight belt when I want to get on the boat. And attaching the weights to the tank strap is not an option. I was taking my rescue diver course. (We were also taught not to have un-ditch-able weights)

Why I am asking here is so that next time, if i am given a similar setup, at least I would know how to use it properly without ruining the whole dive (trip). Not really planning to get my own BCD in a foreseeable future too.

So.. Am I able to remove the regular weight belt without undoing the whole BCD? Should I wear the BCD then the weight belt on the outside? Or Should I wear the belt higher then usual so that it is above the straps?

Thanks in advance. =)

trekdive

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Re: Back inflated BCD
« Reply #5 on: 30 Mar 16, 11:38 »
For me, I removed my crotch strap in my bp/w setup. In my setup, I am almost weightless unless I use positive fin.
Belt should be on outside for easy ditching in emergency, imo. For Bp/w, I think good to have weight  that can remove/ditch weight in emergency.

snikrs

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Re: Back inflated BCD
« Reply #6 on: 30 Mar 16, 11:46 »
Wear the BCD first, then weight belt over if it has to be ditchable. Wearing it higher than the straps would mean the belt goes between the plate and your body. Quite hard to ditch I would assume...


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poh6702

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Re: Back inflated BCD
« Reply #7 on: 30 Mar 16, 12:24 »
logically one should wear weight belt over the BCD and not the other way round, because if for any reason one need to take out the BCD in order to climb up the boat, weight belt must be removed first before BCD, if it is the other way round, when one take out the BCD before weight belt will immediately sink to the bottom, that can be dangerous.

seaturtle

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Re: Back inflated BCD
« Reply #8 on: 30 Mar 16, 21:53 »
Aside to trekdive, won't your bp/w ride up behind you when you're floating on the surface?

trekdive

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Re: Back inflated BCD
« Reply #9 on: 31 Mar 16, 01:08 »
Not a big issue to me as my shoulder strap is short, and there is the belt holding it down. Not much free play, Also my wing only 18lbs lift, not much air to shoot high up. I feel if the whole bcd is loosely fit, those back inflated or jacket style could also ride above shoulder.