suit or wing inflation

[pauldiving]

im planning on trimix training this year

i have been using my 2.5 ri suit for bouyancy would it be better to use my wing or both?
i dont have problems holding stops i just want to know what others do....
i know that dir lot use wing and keep suit a bit tight....
im using 2x12 backs
and alu 7 stage
2 v weights

cheers

paul.

[Miss Roxy Chablis]

Several things to consider mate:
Most of the DIR lot use relatively incompressible thinsulate undersuits (Santis, DUIs + Xerotherms) which don't need a lot of gas to retain their insulation, unike "loft" type undersuits which do. Gas is added just to take the squeeze off the suit and leave it feeling about as tight as it does when you're floating on the surface
Even with one stage and two full twelves full of gas, assuming you're correctly weighted, you will need to add a lot of gas to a suit to get neutral in the early stages of a dive.
If you progress to diving with more stages - this problem will only get worse.
You've then got a lot of "suit" gas in a place where it is relatively hard to control and can give you light feet and other buoyancy control problems as you start to ascend much lighter for the gas you've breathed down at the end of the dive.
Gas can be put into a wing and dumped at will with a lot more control.
A big vote for wing
HTH

[pauldiving]

nice one i thought so,
i shall try it out tomorow and have a fiddle around..

thanks

[Miss Roxy Chablis]

In reality - what you end up doing is adding about one small squirt to your suit for every two big squirts to your wing as you descend. You will need to add a fair amount of gas to your suit to stop you from feeling "shrinkwrapped" - but although it contributes in a small way to your overall buoyancy - it's really just there to give you mobility so you can move your arms and legs and reach your valves.
If you haven't got a good undersuit - you will find yourself adding more than is ideal to the drysuit so you don't freeze your tits off.
Play around with using both and hopefully you should feel the difference

[nigelH]

The whole thing with Trimix is you don't want to put it in the suit.
Helium is a very conductive gas when it comes to heat.

Running two separate sources for buoyancy is a good idea but as a twinset full of trimix is a lot lighter than a twinset full of nitrox a lot of people go back to using the suit for buoyancy despite it being heretic speak in most techie circles.

[pauldiving]

i tryed wing only down the quarry on sunday morning
i found the suit easyer to control...
i suppose i shall have to get argon cylinder...
more bloddy kit to lug around ha ha...

[zepp]

There is no right or wrong, just what suits you best (no pun intended). I have only ever used my suit for bouyancy and used to carry a separate 3ltr cylinder for this but now I inflate from my bailout cylinder containing nitrox. I feel the added problems of an extra cylinder, extra 1st stage and of course the extra weight are not worth it. Also there is less chance of jumping in having forgot to top up your suit inflation cylinder.