Outboard on P-19

Sam Finlay (sam.finlay@ey.com)
Thu, 12 Aug 1999 11:36:46 -0400

- - - - - - - - - - - - - - - - - - - - - - - - - - -
West Wight Potter Website at URL
- - - - - - - - - - - - - - - - - - - - - - - - - - -
I can't help you the "math" but some experience may suffice. It's not the transom I worry about. I think the previous owner of
my P15 trailered w/ the Tohatsu on the mount. The motor mount was split badly when I got it. It looked OK but the fiberglass
layers had separated so that you could slip a wire from top to bottom everywhere except the plywood pad. I epoxied the
whole thing back together but I think the mount is way too fragile to leave the motor mounted. Even in it's "restored" state it
still flexes from side to side more than I'd like. It's just too under-engineered.
Sam Finlay
P-15 1964
Luray, VA

From: "Rich Duffy" <duffy@maui.com>

uhh... but seriously folks, Jim's playful note has prompted me to
scratch head and consider the comparative impact (on the transom
structure) of an accelerating motor in the water versus a bouncing
motor on the transom.

I've been following what I took to be the mailing list's group
consensus that it was foolish to trailer the boat with the motor
mounted on the motor mount--that this could easily generate forces
that were far in excess of what the transom was designed to handle.

I don't recall how we calculate impact, but I would guess that we'd
have to figure in the strength of the prop shear pin ... and the
stiffness of the trailer springs (here in Hawaii, we blow off skip
all pothole-impact adjustments).

Has anyone got a good handle on what the math says about this stuff?
Especially with regards to a skimpy little 3.5 Nissan on a P-14

Note: The information contained in this message may be privileged and confidential and protected from disclosure. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please notify us immediately by replying to the message and deleting it from your computer. Thank you. Ernst & Young Technologies