boat design contests

Design Challenge IV

It is up again, at www.proboat.com. Upper right, second item.

I do apologize for the inconvenience.

Thanks, Carl

 

Seriously? a full design study (upto reasonably detailed plans) to be on public display and only possibly win $1000? Come on guys, how much do you think we get out of bed for? That's an awful lot of work for $1000. Now, narrow the scope a bit (perhaps maximum power limited) and make it a design-build-race challenge and it would be much more interesting.

Don't get me wrong, I like competition and innovation, but I think this is just going to produce what we have seen before. Why not let people use their imagination and see what works?

Cheers,

Tim B.

 

Get with the spirit. If you win, you get publicity. You keep all the copyrights; we don't show offsets if you don't want us to.

Use your imagination and make it work. If you've seen our past competitions, you'll know this is how to win.

I will, however, pass along your comments to our eds and see what response(s) they have.

 

Catamaran design

I am a new member. My limited hobby time is spent on sailboat design.
My latest design is a 42 ft cruising catamaran. See image attachements.
The design features:

> 42 X 25 ft catamaran with planing (or semi planing ) hulls.
> Aluminum structure at 20,000 lbs displacement with 1.5 ft draft.
> 2 masts, one on each hull, located aft.
> Rig is 2 jibs with furling gear. Rig has no mainsails.
> Mast is a compression member with very little bending moment.
> Wing located between top of masts is a compression member that
eliminates the need for outboard shrouds. Inboard shrouds support
each mast.
> Large foil mounted at bow, above water line, provides bow lift
in case of a nose dive or pitchpole event.
> Not shown are centerboards, mounted inboard of the hulls, that
rotate (rotary actuator) to reduce draft in shallow water.
> Not shown are transom rudders that rotate(rotary actuator) to reduce
draft in shalow water.
> Not shown are outboards motors at transom of each hull.
> Not shown are rigging details like booms to control jibs.
(the above work is in process)

 

Welcome to the forum Dlawson. Interesting biplane aft mast rig, though I question some of your loading assumptions.

 

Cat 42 reply

thanks for your comment.
Yes, as required by all design, good structural analysis
is necessary. With what little time I can contribute,I am working on the
loads followed by failure modes and resultant stresses.
The hulls and cabin superstructure will have to be analysed for bending,
shear and must inlcude hull racking (torsion). since this is a hobby, I do not
have access to FEM codes like ANSYS, so I will do much old fashion
hand calc's that will include shear flow. just takes alot of time.