Re:Flat hatch design

[Mike Young <tvcmikey@yahoo.com>]

Steve,mike here,
At 400 feet, the pressure is horrendous. If you went down with a flat
hatch it would buckle inward before that. Even on a military vessel,
the hatches are domed with a flat fairing to reduce drag on the outer
hull.
Trust me.




---STEVE McColman <steve_mccolman@hotmail.com> wrote:
>
> I am building a dry, one person sub that i would like to take to 400 
> feet.  My conning tower is 20 inch dia.  I need to know if it is 
> feasible to use a flat hatch at 400 feet, and if so, how thick it
would 
> have to be?      Steve, Vancouver Island
> 
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