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West Wight Potter Mailing List maintainer
dfarrell@ridgecrest.ca.us
List hosted by www.tscnet.com
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On Wed, Feb 09, 2000 at 06:03:11PM -0700, Jim Nolan wrote:
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> West Wight Potter Mailing List maintainer
> dfarrell@ridgecrest.ca.us
> List hosted by www.tscnet.com
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> A 4hp motor has roughly 200 pounds of thrust. This force is directed normal
> to the surface of the transom, in this mode the transom is the weakest.
> Trailering a 50 lb motor puts the forces mostly in shear on the transom. In
> this mode the transom is the strongest. For concerns about moment forces,
> when the motor is down propelling the boat this has a much greater moment
> than when the motor is raised in the trailing position (400 ft lbs vs 50 ft
> lbs roughly). If you are concerned about the transom when trailering you
> should also be more concerned about the transom when motoring the boat.
You are overlooking shock loads, and the lever arm of the motor mount.
The thrust of the motor in operation is, relatively speaking, a quite
smooth force...
-- Kent Crispin "Do good, and you'll be kent@songbird.com lonesome." -- Mark Twain
This archive was generated by hypermail 2b29 : Tue Feb 29 2000 - 03:27:07 PST