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Author Topic:   Small Whaler Outboard Mounting

Barney posted 05-16-2004 08:18 PM ET (US)
After reading this forum for a few years, I realize that proper mounting of the outboard on a Whaler is key to the best performance. My question has to do with the 11 foot Whaler.
http://myweb.cableone.net/barney9014/images/11/5.jpg
When I mount my 15 HP Yamaha "short" outboard all the way down on my 1980 11 foot Whaler, the cavitation plate is a few inches below the bottom of the boat. Now I am considering bolting on the outboard. My young Nephew will be in training on the boat this summer so I would prefer to get the outboard back with the boat. Also if I permanently mount the outboard I would like to get the best performance when I take it out. :)
Should I mount the outboard at a better performing height, say with the cavitation plate at the bottom of the boat? Does anyone have a recommendation or does it even matter on a Whaler this small?
Thanks JimB
jimh posted 05-17-2004 08:41 AM ET (US)
If bolting the motor on the transom, I'd verify that you can use a standard hole pattern. If that is workable, drill the transom with the standard outboard engine mounting hole position. This should permit some adjustment of the engine mounting height, assuming the 15-HP Yamaha has the necessary multiple holes in its transom bracket.
Raising the motor to have its anti-ventilation plate flush or just above the hull bottom at the transom is probably the recommendation for initial height.
Barney posted 05-17-2004 06:07 PM ET (US)
jimh, Thanks for the reply, JimB

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Author	Topic: Small Whaler Outboard Mounting
Barney	posted 05-16-2004 08:18 PM ET (US) After reading this forum for a few years, I realize that proper mounting of the outboard on a Whaler is key to the best performance. My question has to do with the 11 foot Whaler. http://myweb.cableone.net/barney9014/images/11/5.jpg When I mount my 15 HP Yamaha "short" outboard all the way down on my 1980 11 foot Whaler, the cavitation plate is a few inches below the bottom of the boat. Now I am considering bolting on the outboard. My young Nephew will be in training on the boat this summer so I would prefer to get the outboard back with the boat. Also if I permanently mount the outboard I would like to get the best performance when I take it out. :) Should I mount the outboard at a better performing height, say with the cavitation plate at the bottom of the boat? Does anyone have a recommendation or does it even matter on a Whaler this small? Thanks JimB
jimh	posted 05-17-2004 08:41 AM ET (US) If bolting the motor on the transom, I'd verify that you can use a standard hole pattern. If that is workable, drill the transom with the standard outboard engine mounting hole position. This should permit some adjustment of the engine mounting height, assuming the 15-HP Yamaha has the necessary multiple holes in its transom bracket. Raising the motor to have its anti-ventilation plate flush or just above the hull bottom at the transom is probably the recommendation for initial height.
Barney	posted 05-17-2004 06:07 PM ET (US) jimh, Thanks for the reply, JimB