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Hi fellow divers,

The variable ascent rate from a UWATEC bottom timer ranges from 
7m/min(when shallow)-20m/min(when deep). I can understand the
reason for variable ascent rate but i do not understand the
absolute limit of 20m/min.

In a brochure of the Alladin air X they mention that the upper limit 
of 20m/min is because of dive technical reason. What is limiting you
from going faster than 20m/min when deep (say deeper than 50m) ?
Besides, if you make deep stops shouldn't that allow you to go
faster up to a certain point without bubble formation risk ?

I would like to know where i can get the following references :
(they are both cited in the Alladin air X brochure)

Ref 12 
Van Liew, H.D. (1991), Simulation of the dynamics
of decompression sickness bubbles and the generation of new bubbles,
Undersea Biomedical Research,VOl.189,No.4

Ref 13 
Vann, R.D. (1982), Decompression Theory and Applications, in
the Physiology and Medecine of Diving, 3rd edition, Baillere Tindall,
London

Safe diving

Xavier Merlin
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