Hi Dennis,
I second that about a very nice looking boat and also second the questions about leeway resistance. My calculations gave a heavier boat overall going to an Atlantic configuration due to those racking loads, but judicious use of carbon should overcome much of this.
I also wonder about how to prevent being taken aback. I played with a significant pod to ww to allow ww sheeting to allow the masts to have the maximum bury to the keel.
--- In harryproa@yahoogroups.com.au, Mike Crawford <jmichael@...> wrote:
>
> Dennis,
> / /
> That does look nice.
>
> I'm partial to rigs on the leeward hull because I'd rather reduce my
> windage as a hull flies instead of increasing it, and also to maximize
> internal space in the windward hull. I'd also rather keep the windward
> hull free of rig stress, particularly because of the wracking loads that
> will be imposed by that long leeward hull.
>
> However, once the boat is large enough, having the mast come through
> the windward hull won't matter -- you'll have the room. You'll still
> have to design for the rig and wave forces that now need to be
> translated through the amas, but I imagine that can be done.
>
> What you gain is a short leeward hull, which may make transporting the
> boat easier, and also safer access to the rigs while sailing.
>
> You can fit that on a trailer in 8.5'? Now THAT is impressive.
>
> How is that done? By tilting the windward hull on its side and
> storing the leeward hull in the "L" created by the windward hull and the
> bridge deck? Would you design a trailer to do this, or rely on a yard
> with a crane?
>
> Also, how are you planning to deal with leeway resistance and steering?
>
> Regardless, it's great to see people pushing the envelope.
>
> - Mike
>
>
>
> On 7/26/2010 7:59 AM, Dennis Cox wrote:
> >
> > I guess I'm one of the culprits stirring the pot.
> >
> > I'm not looking to do an all out racer. This is purely my design
> > philosophy for my one-off boat. I'd like some fast transits. I'd
> > like to do some races if I happen to land myself in a friendly island
> > race. I don't have any intention of getting into races where
> > competitors are getting points toward some championship or are willing
> > to maliciously cut across my path to force a shunt. I wouldn't want
> > to do any open ocean, multi-day races (TransPac, Bermuda, etc) I
> > also want a con-da-frik'n-minium, so my weight will not be
> > competitive. I ended up with a 60' (18.3m) lee hull. The
> > accommodations drove the size more so than the outright speed.
> > http://www.boatdesign.net/forums/multihulls/search-prefect-proa-33468.html
> > <http://www.boatdesign.net/forums/multihulls/search-prefect-proa-33468.html>
> > I enjoy the theoretical work using Michlet and now I'm tinkering with
> > Flotilla thanks to Rick. Do I really think I'll see 30 knots? Nah!
> > It doesn't even take into account rudder/daggerboard drag much less a
> > dozen other things. I think I'd have the biggest Cheshire Cat grin
> > you ever saw, if it touches 20. Beating a GunBoat in a race would be
> > my biggest goal.
> >
> > Dennis
>