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Hi all,
	There is currently a discussion within my club over the
	problems of useing an air integrated computer (Air-X is
	the one we normally mean) with a twin set. 

	Now currently in my club we use a variety of computers
	but the dominants are the Solution and the Monitor-2. 
	The Air-X is attractive, although I first thought the
	air integration was a bit of a gimmick until I had details
	of the use of the updated decompression algorithm taking
	into account air consumption and temperature.

	For air redundancy people in my club use 3 litre pony's
	but our deco stops are normally planned to be less
	than 6 minutes. Note we don't use the pony for deco 
	stops its there for an emergency with what we hope is 
	enough air to complete a dive and stops if required. 
	Some people are planning to buy twins to increase air 
	carrying capacity and also air redunduncy so allowing
	longer deco stops with adequate redunduncy.

	The problem we are posed with is how can you make the 
	most of both these pieces of equipment. If you have
	totally independent twins you have two regulators
	but only one will have the air sender unit so that
	when you use the second cylinder you loose the advantage
	of having an air integrated computer. If you mandfold
	the cylinders together (still with two regulators) you 
	can use the air integrated computer to monitor your
	air but you lose a degree of redunduncy. Assuming
	you can isolate a cylinder how easy will this be in
	an emergency without the aid of your buddy.

	Another senario in the manifolded setup is if your buddy
	requires your second regulator (assuming their main and
	redundant systems failed). The air integrated computer
	will see a doubling in air consumption (at the very least
	given this is now a stress situation) and modify the
	stops accordingly. This should not cause a problem as
	extra stops will only make a DCI hit less likely but
	the info is in error.

	Anyone out there using twins with an air integrated
	computer? Have you come up will a better solution
	than the two compromise solutions above? 


		John

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