1748Re: [AtkinBoats] Re: Twinkle Twinkle little boat
- Jan 4, 2008Well, since we're talking a planing (or semi-planing) boat and somewhere in the same time period as RM, the 15HP RM engine was pegged by Bill A at about 340# & 91ci. As to the smaller engines, I remember in the late 40s that 16' inboards in the Puget Sound (rental boats at "resorts") usually had a 2 or 3HP Briggs & Stratton or equivalent (Reinell and Marysville Boat Works both used that) and they moved along quite nicely at 6 or so knots (nobody really measured that sort of thing back then - it just got you there fast enough or it didn't).
----- Original Message -----
Sent: Friday, January 04, 2008 3:46 PM
Subject: [AtkinBoats] Re: Twinkle Twinkle little boat
I don't have Gerr's book yet so I suppose the spreadsheet would not
help me much. Thanks for the offer though.
Part of the problem is that I'm not sure what engine was supposed to go
in these boats originally. Typical small sizes (3hp) were often cast
iron, two stroke, make-n-break ignition. Above twenty horsepower they
were often small marine four cylinder equipped from Grey marine or
Redwing, etc. What were the in between marine motors like? A ten horse
make-n-break is heavy. That could weigh as much as the hull! I would
suppose the hull to be around 300-400lbs. This makes estimating the
weight to horsepower difficult.
I would think the tunnel would force the bow down in acceleration like
on Mr. Whites RM. The jet of water from the tunnel would pull the water
from transom and make it difficult to tell when she would be on plane.
This design is right at the threshhold of a semi-planing boat. The
concern is that she might not perform well unless very lightly loaded.
If fuel mileage in this day were not a concern I would build a Little
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