Hi Rick,

My favourite multihull design has two submarine hulls, with a platform above supported by low drag struts that also provide leeway prevention.

It's to my eternal shame that I haven't proceeded to a prototype, even though I thought of it over 10 years ago :-)

The video you posted the link to has re-fired my enthusiasm.

One of the main pluses is that most of the hulls can consist of off-the -shelf water pipe, of appropriate diameter and strength.

One problem I didn't solve was maintaining ideal depth, but I imagine vanes actuated small floats may do the job.

Cheers,

Col C
--- In harryproa@yahoogroups.com.au, Rick Willoughby <rickwill@...> wrote:
>
> You should see some of the things I get asked about. No matter how
> silly an idea may seem it can always provide some inspiration for the
> next development. Forums are a great source of ideas. A serious
> problem with professional training is how narrow minded it can be and
> stifling of development.
>
> My take on boating has been expressed better than I could here:
>
> "There is nothing--absolutely nothing - half so much worth doing as
> simply messing about in boats."
> - Kenneth Grahame, The Wind in the Willows, Ch. 1
>
> My funniest experience on reflection was trying to mount that V8
> submerged buoyancy boat on a wintry day in front of a high school
> physed class canoeing at the local lake. It took me an hour to get
> on it after getting dunked many times. Once I got it going I could
> gat the front stabiliser to rear up out of the water until I was on
> the verge of rolling backwards.
>
> The theory on drag reduction was sound but my execution had too many
> problems to solve. I later found someone had many of the problems
> sorted:
> http://www.youtube.com/watch?v=kRuUtOmMGR0
> The first few seconds of the clip show some of the issues. It
> eventually gets to the impressive part.
>
> Rick
> On 17/05/2011, at 12:38 PM, jhargrovewright2@... wrote:
>
> >
> > Rick Willoughby,
> > Thank you for your answers and comments but mostly.... for your
> > incredible body of work. It is fun to see some of your crazy ideas
> > work...well. You have tried the strange things that your brain and
> > curiosity and your numbers said could work. You are a trailblazer
> > with an open and curious mind. Each boat shows a progress of
> > methods and materials. I can see and feel the joy you derived from
> > these experiments or should I say...boats.
> > If I continue this...it would really get mushy.
> > JIB
> >
> >
>
> Rick Willoughby
> rickwill@...
> 03 9796 2415
> 0419 104 821
>