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Mike,

I've conducted several tests on bouyancy change while under water.  I've also
calculated the speed of the ascents as well.

Test #1: I dived to 100 feet. At 100 feet I tied myself to the wreck,
inflated my BC and dropped my weight belt. Along side me was a state trooper,
who, using his radar gun was able to detect my ascent speed. I cut the line
attaching me to the wreck, and according to the radar gun I ascended at 160
feet per minute. I was in an upright position, low drag. I cleared the
surface by 4 feet. As my bottom time was less than three minutes, no signs of
DCS. (thank god).

Test #2:  I dived to 200 feet. At 200 feet I tied myself to the wreck,
inflated my BC and dropped my weight belt. Along side me was the same state
trooper, who, using his radar gun was able to detect my ascent speed. I cut
the line attaching me to the wreck, and according to the radar gun I ascended
at 220 feet per minute. I was in an upright position, low drag. I cleared the
surface by 16 feet. This test required a table 6  treatment with three
extensions. 

After recovery, I decided that I should try one other test.

Test #3: I dived to 200 feet, this time on Tri-mix (the other tests were on
air). At 200 feet I tied myself to the wreck, inflated my BC and dropped my
weight belt. Along side me was the same state trooper, who, using his radar
gun was able to detect my ascent speed. I cut the line attaching me to the
wreck, and according to the radar gun I ascended at 330 feet per minute!!!. I
was in an upright position, low drag. I cleared the surface and continued
rising through the air until I reached an altitude of 8,000 feet, then I
plummeted back to the ocean, was submerged to 70 feet, where I calculated
deco. After deco I surfaced,  no signs of DCS. 

I hope this information is helpful.

Safe Diving,

Raimo.

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