Re: [PSUBS-MAILIST] Under water lighting: Q for Ron Leonard

["Captain Nemo" <vulcania@hawaii.rr.com>]

----- Original Message -----
From: "ronleonard" <ronleonard@shaw.ca>


> With an ambient sub, you won't get water leaking in, rather air leaking
> out. Not a problem so long is it isn't too much of a leak.
> Ron

Hi  Ron,

Been a while.  Trust you're doing well.

If I understand correctly, Greg wants to turn a modified SPORTSUB hull (used
on the surface as a movie prop) into a diving closed-compartment ambient
sub.

Exactly how tall is a SPORTSUB hull?

And considering the pressure differential low / high within the sub (I.e.,
since the internal pressure needs to be great enough to push the water out
the bottom of the sub, it will therefore greater than the external pressure
at the roof) , what do you think about the potential integrity of his roof
hatch (which won't have water pressure forcing it shut): easy to leak air if
not well made and tightly torqued down on the seal?

SPORTSUBS work really well as they were intended to work.  Generally, what
do you think of modifying them into closed ambients, especially with a roof
hatch?

I see a lot of potential buoyancy there.  The hull and components are light
in comparison to a steel dry sub, so it looks like a lot of hard structural
ballast  will have to be added on.  Any suggestions on how to attach that to
a fiberglass hull so as to minimize the possibility of it tearing loose?

VBR,

Pat