The STA is a great addition to the BP\W system, specially the weighted STA (like Halcyon or Light Monkey) in cold water in the PNW as it trims really nicely and moves 6lbs from trim pockets or weight system to the center of your back.
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The STA is a great addition to the BP\W system, specially the weighted STA (like Halcyon or Light Monkey) in cold water in the PNW as it trims really nicely and moves 6lbs from trim pockets or weight system to the center of your back.
BPW's are actually easier to doff and don underwater than most jacket bcd's. They don't flop around, they don't have buckles and unnecessary straps and buckles getting twisted and tangled.
As you said later, the Halcyon Eclipse needs the STA. That's where the camband slots are to attach the tank.
The Halcyon STA is 7/8 of an inch. Slightly further back actually helps petite women so that the valve doesn't hit our head, and the STA keeps the tank perfectly stable. It's also a great place for the weight in the STA and trims out nicely.
If I mounted my tank to my bcd and wasn't paying close attention, my head would touch the back of my first stage and that really ticked me off...
Ayisha;7307026 [URL="http://www.halcyon.net/?q=node/7":BC System Weighting | Halcyon[/URL]