Jon I agree with you on the snag potential.
Hopefully I will be playing with some early 1800's schooners.
The hemp rope etc
on board is as strong today as the day it went down,
scary
I could build additional tanks below my deck,
but the problem I have with that is the lift is coming to far
forward. I need to keep it
closer to the CG. This was my first solution but I would have to
add another in the aft
to balance the buoyancy.
Dean
In a message dated 12/3/2009 12:55:23 P.M. Central Standard Time,
jonw@psubs.org writes:
Scratch my "cage" idea Dean. I realized that your "snag"
potential with
an exposed cage would go up by a factor of about
10^32. Very bad idea.
Jon
Jon Wallace
wrote:
>
> What is the advantage of having the tank bottom sealed
with hypalon
> instead of merely open to the water? Containment
of air without
> burping (and losing air volume) at the
surface?
>
> What about building a cage for the hypalon or lift
bag similar to a
> rebar skeleton use for columns? This would
retain the shape of the
> inflated bag but at the same time offer
minimum drag with no water
> mass from an enclosed tank to worry
about.
>
> Jon
>
>
> Sean T. Stevenson
wrote:
>> This suddenly made me think of something - and I'm sorry
that I'm not
>> at my own workstation right now or I would sketch it
- but imagine if
>> you will hard ballast tanks (saddle tanks),
slung high under the
>> weather deck, sized appropriately for the
design waterline with tanks
>> blown. These tanks would have a
flat bottom instead of being faired
>> into the hull, and attached
to the underside of these tanks are
>> hypalon buoyancy tubes which
are ordinarily deflated (thus
>> eliminating the extra mass of water
to be moved, but adding some
>> surface / form drag), but which may
be inflated to increase the
>> freeboard in specific circumstances,
or, if appropriately sized, as a
>> salvage measure.
>>
-Sean
>
>
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