<< snipt>>
<<Will she stand up to a breeze, with the Center of Bouyancy way above the
Center of Gravity (large righting moment)? If so then go tall, JBlumhorst,
design that tall high aspect ratio rig to maximize luff length. If she be
tender, then you will be reefing that horsepower away before she can really
get moving on a tall rig.
Short and stubby might be just the thing for a tender boat, she won't go to
windward with the first of the fleet, but she just might stay with them on a
reach.
What's that? You want the boat to go to weather at the expense of all else?
Let's design a fractional rig, say 13-15/16th's, with a thin, whippy section
that tapers so much you can pick your nose with the masthead. Good for
powering and de-powering the main.
A long luff will maximize drive in the foresail and the main for a given area.
Other benefits too, we can get away with slightly overlapping jibs, no big
genoas, with high clews. This gives tighter sheeting angles, better
visibility, lower sheet loadings, smaller winches and blocks. Downwind will
suck though, unless we hang a spinnaker out there to keep up with short and
stubby...>>
<<snipt>>
If I apply his knowlege to the P-19, I get this:
The Potter is stable (doesn't heel hard over) so you can usefully harness more
power than a tender hull (heels alot). You get more power by using high
aspect ratio sails (long luff, short high clew). Heeling isn't a problem with
the high aspect jibs, because it's a fractional rig, which automatically
limits how high the Cneter of Effort can be. You also get lower loads on the
blocks, tighter sheeting angles for going to windward, and better drive out of
the overlap between the foresail and the mainsail with the high aspect ratio
sails.
(Another thing, since the P-19 is a semi-planing hull, you can usefully
harness the extra power in a high aspect ration sail to climb over the
standing wave at the bow and exceed the 5.3 knot limit for a displacement hull
of the P-19's waterline length.)
And if you want to go to windward, design a fractional rig with a whippy top
of the mast and a pointy head on the sail.
But you'll pay for the ability to point and the increased drive with reduced
downind performance. You need to add a spinnaker to get downwind performance
to keep up with the "first in the fleet"
If his advice is correct, the P-19 Tall Rig with high aspect ratio headsails
is the ticket, if what you're looking for is speed. (Of course, lanteen rigs
are easier to sail, short rigs fit under bridges better, etc.)
Judith Blumhorst, DC
WWP-19 #266 "Red Wing"
SF Bay, CA