On Sun, 30 Mar 2008 16:55:10 +0700, Bruce in Bangkok
wrote:

snippage

Basically what you are talking about is called a floating dry dock and
is in fairly common use, except that you aren't pumping the tanks so
it will only work in areas with fairly big tides.

I still think it is a bad idea. Redesign it to pump the tanks with an
air compressor (remember to do all this heavy maintenance you are
going to need a generator to furnish electrical power so why not an
air compressor) and make it into a real floating dry dock and it will
be rather more useful.

Bruce-in-Bangkok
(correct email address for reply)

My yacht club has a variation on the floating drydock concept that we
call a "lifter". The lifter floats are never flooded - instead, a
platform between the floats is raised an lowered using an electric
winch. When lowered, the boat can be driven onto the platform, then
the platform is raised to allow work on the boat.


--
Peter Bennett, VE7CEI
peterbb4 (at) interchange.ubc.ca
GPS and NMEA info: http://vancouver-webpages.com/peter
Vancouver Power Squadron: http://vancouver.powersquadron.ca