Tank bouyancy info available on the internet assumes air contents, so
when using helium mixes your buoyancy will be slightly different. 
Choosing a wing based on its capacity should also take into account the
need to float the twinset independently of the diver, such as when
boarding a boat in the ocean.  This should dictate how much weight you
need on the belt, and how much can be integral to the twinset.  When
diving wet, or in a neoprene drysuit, you also have to account for
compression of the suit and make sure you can get up in an emergency -
you can't test this in a pool.  Tweak your weighting through diving.  I
use the Halcyon 65.  Sometimes I do SAR dives in aerated water, such as
beneath a waterfall, and so need the lift even when the belt is
dropped.

-Sean


On Mon, 24 May 1999 15:35:13 -0400, Tony Blanchette wrote:

>Isn't the bouyancy thing as simple as this?
>
>1.  Get in your backyard pool nekkid and record how much weight you need
>to sink you.
>2.  Put on your dry suit, without undergarments,  and record the
>additional weight necessary to sink you.
>3.  Put on your undergarment with the dry suit, and record how much
>weight it takes to sink you.
>4.  Figure out how much additional weight it takes to sink each of your
>wetsuits.
>5.  Record the bouyancy characteristics of your equipment (lights, etc.)
>
>After doing this, and making appropriate conversions (the 62.4/64 thing)
>shouldn't one be able to calculate the weight necessary for a dive?
>Depending on your garb, simply calc the weight needed in addition to the
>"full tank bouyancy" and then add, in weights, the differential between
>a full tank and an empty tank.  The tank info is readily available from
>several sources on the net.
>
>Therefore:
>
>	6 pounds to sink me (need to work on the lean/fat thing)
>	12 pounds to sink the drysuit (this and the next one are
>guesses, just got the drysuit and ain't been in the pool)
>	8 pounds to sink the undergarments.
>	Full tank = -6 pounds  empty tank = -1 pound  - add 5 pounds
>	Backplate = -6 pounds	subtract six pounds.
>	Manifolds, d rings, fins  subract two pounds
>
>	Ergo, wear 23 pounds between the Vweights, Pweights and
>waistweights.
>> -----Original Message-----
>> From:	S I L E N T  I M M E R S I O N [SMTP:silent@cu*.ne*]
>> Sent:	Monday, May 24, 1999 11:56 AM
>> To:	techdiver@aquanaut.com
>> Cc:	Anttila Matti
>> Subject:	Re: How much buoancy to Halcyon Explorer?
>> 
>> All steel tanks? 
>> What kind of suit?
>> 
>> If you dive a drysuit with these steel tanks (which you should), the
>> 55lbs
>> will be fine.
>> 
>> Regards,
>> 
>> THOMAS
>> 
>> >Hi!
>> >
>> >I'm diving with twin 10 litres 200 bars (ss) and one 7 litre EANx and
>> >one 5 litre O2. I'm buying Halcyon Wings (Explorer) for deep ocean
>> >dives mainly. What size would be the best? 45, 55 or 65 lb?
>> >
>> >Matti
>> >--
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