Originally Posted by Kettlewell
Not a Searunner
owner, but love 'em, and own I think just about everything Jim Brown and John Marples have ever written. I did own a 32-foot plywood
French cat for many years that was a cat equivalent of a Searunner
in many ways, and it was powered by a 9.9 HP Yammy outboard
. One thing we noticed is that she would keep ghosting in almost no wind
long after any of our boats that have dragged props around. We were stuck one time three days from Bermuda
in a windless high with a massive gale coming along with a bunch of boats coming up from the Caribbean
. The gale was so nasty that several boats used up all their diesel
trying to get in before the storm, and we were down to next to none in the gasoline department, but our boat would just keep inching forward despite the fact that smoke went straight up. I really couldn't understand what kept us going, but in three days we made something like 100 miles and got in just before the storm while a bunch of boats with inboard diesels got caught out and a few suffered serious damage, injuries, rollovers, etc. The total lack of drag with an outboard
is an offshore
advantage at times.
I've read all of your articles from back in the Multihulls Magazine days, (along with all of the others that they, and Jim or John ever wrote as well).
If memory serves, I saw your "Echo" once at Lady's Island Marina in Beaufort
SC? I agree, sort of like a Searunner, only a cat. It was a very intelligent design. I understand that family
size requirements turned you to the "dark side", (monohulls)... That's OK, you're always welcome here!
I agree that many small multihulls, particularly cats like yours, and my friends on Magic Carpet, lend themselves to small OB kickers so well, that they make a lot of sense. The minuses are fewer than on a tri, and the pluses of "0" growth, and "0" drag when raised, really change the equation in their favor. Also tris lend themselves to "single" inboards better than cats do. Cats have to either resort to inboards in a nacelle with a single
outdrive, OR twin engines with twice the complication.
Even given my stated preferences on Delphys... On your Echo, I would've opted for OB power too. OB power was just was right for the design.
One point about inboards & their extra drag... It IS considerable on fixed props, (WAY more than they think), and there is still "some" on steeply angled shafts WITH a folder, but in our case, and what works best regarding drag...
We used a "Flexofold" which was tested by MIT to be the "slipperiest" and most efficient too. More efficient than a fixed prop, or the Gori, Max Prop, Martec, etc.
We have a molded in & carefully faired shaft log, with faired in "bonded" strut, and a totally horizontal shaft, that doesn't disturb the water
flow at all.
With the prop folded... The drag induced by such a svelte drivetrain would be virtually UNmeasurable. Now, my rudder
to skeg hardware
, with their nuts n bolts sticking out, THAT does slow us down a bit. Wish I could fix that!
Just a thought...