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Moderator: Bill Edmundson

Posts: 1
Joined: Fri Dec 12, 2008 7:25 pm
Location: Victoria B.C. Canada


Postby marksteele » Sat Dec 13, 2008 11:41 am

I've long toyed with one concept : There must be a hull shape for a
monohull that would be curved more on it's windward waterline than
on it's lee waterline.If this were the case , then the hull would , whenever
it had forward momentum , pull upwind.
The problem has always been this : how would the hull know from which
side the wind was coming from?
Eventually , after much trial and error , I discovered one.
A normal sailing hull is a symmetric , 'clean hydrodynamic' shape.
What would be required would be an assymetric 'clean hydrodynamic'
Such a shape sounds impossible - to design something that would only
be assymetric when you needed it to be , and symmetruic when you
didn't , would be impoossible.
Not really - there is one 3 dimentional vessel shape that actually
is symmetric when it is upright , and assymetric when it is rolled.
This shape is a segment of an orange.
If you build a vessel around a 60 degree equilateral segment
(spherical segment) you end up with a 3 sided 3D wedge.
Now - if you vary the two flat sides , just a bit , by bending into them
a little outside curve , they become structurally sound.
The outermost spherical curve changes into a non-spherical , simple
3D curve , that is , a single plate , bent end-to-end.
What you're left with is a sealed vessel , with 3 sides.
What I did , experimenting , was I took this 3 sided sealed vessel
and I put a mast on it , and a boom, and a controllable mainsail.
What I discovered was , that this hull shape becomes assymetric if you roll it off vertical.
What I then did , was I modified the bottom plate , so that it had sea
breaking ability - I cut a stem into it.
What I was left with was a very interesting final product :
a pressure vessel.
This hull , in it's model form , with radio controls built inside it ,
could be immersed to enormouse depths , and because the deeper
you immersed it , the tighter the 3 seams became , it proved
uncrushable , at least under water.
Hydraulic pressure on the outside of the hull tightened all the joints ,
all the seams.
I then approached the U.S. patent office with my discovery , and they
told me it qualified for a provisional utility patent.
Now we're building a 25 foot prototype. 'Venture Hulls (Canada)'
Venture Hulls (Canada) builds a propietary 25'
monohull sloop.
We build to suit , wood/epoxy/CF.
Brentwood Bay B.C. Canada.


Postby upspirate » Sat Dec 13, 2008 12:33 pm

welcome...sounds pics!

bob smith
Posts: 485
Joined: Thu Aug 21, 2008 6:59 am
Location: Chester, SC

Postby bob smith » Sat Dec 13, 2008 4:58 pm

The original Hobie Cats made use of asymmetrical hull design and being a catamaran they had a right and left one (whoops, port and starboard). You just kept the "wrong" one out of the water. There is nothing quite like flying a hull. Almost as good as having a throttle and lots of cubic inches.

Bob Smith
Chester, SC

"It is not the ship so much as the skillful sailing that assures the prosperous voyage."
George William Curtis

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