Page 9 - WestlawnMasthead14_Sept.10.pub

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Safety and stability:
The Presto 30 has a Limit of Positive
Stability (LPS) of 145 degrees! This includes t
righting effects of her deck, cockpit, deckhous
and sealed carbon-fiber masts. With actual ca
size tests done on the Outward Bound HI 30s,
is very hard to capsize & hold these boats dow
Her ballast ratio is only 25% of her 4,000 lb li
ship displacement, and only 20% of a cruising
5,000 lb weight. The Presto 30 has the same
Dellenbough Angle as our high-performance
Quest 30 design.
If you run aground in the Presto 30, pull the ce
terboard up a bit and sail off. If you run agrou
on a falling tide, and lifting the board and rudder only allow you to go further aground, simply keep them bo
all the way up and the boat will settle on her flat bottom. The usual principles of prudent seamanship apply
and one should try to avoid doing this on a lee or rocky/reefy shore! On a boat fitted with an engine you cou
use it to motor into deeper water if depth allows. A keelboat in a similar situation will soon be stuck agroun
lying at uncomfortable and vulnerable angles!
An inlet with unmarked rocks or shifting sandbars can be fatal for a keelboat if it runs aground. Hit-
ting an unseen hazard in a sharpie merely kicks the board by the obstacle. Once past the obstacle the boar
drops to its previous depth.
Any sailboat can capsize, and though unsinkable, the
Presto 30 is not exempted. As explained above, because of her
relatively narrow hull and high freeboard the Presto 30™ has a
theoretical limit of positive stability LPS (hull to the sheer only) of
103 degrees and a ‘real world’ limit of stability (i.e. including deck-
house, cockpit and spars) of 145 degrees!
Construction:
The Presto’s construction and engineering are much the
same as we used for a recent Class 40 design, though infused vi-
nyl ester resin is used instead of epoxy. The scantlings, framing
and fiber orientations are the same, but built in a production shop,
and with only the addition of a light mat and gel coat on the outer
skin. The bottom has extra layers of E-glass biaxial material to
stiffen and strengthen the skins. All cores are Core Cell, and no
balsa wood is used in the structure. Panels are broken up mostly
by ‘structural furniture’, with framing at divisions in the interior.
Presto 30’s Layout:
Cockpit: The Presto 30 has a huge cockpit, 10’-6” (3.2 m) long! The cockpit seats
are over 7’-6” long for comfortable sleeping, and there is plenty of space for a full
Presto 30 by Rodger Martin
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