SPORT 15 Auxiliary Engine Bracket Rated Power

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Author Topic:   SPORT 15 Auxiliary Engine Bracket Rated Power

gyzmo47 posted 04-07-2009 11:51 AM ET (US)
I have a kicker motor bracket on "The Gyzmo" which was made as per the description in the reference section for the 15 foot whaler transom. I have read that almost any h.p. rating will work but I will be using the boat in the Great Lakes and would like more than just minimum push and was wondering if my 9.9 (older 2 stroke) will be to much torque for this bracket.
Tohsgib posted 04-07-2009 12:18 PM ET (US)
Should be fine but may be overkill. Try it but I think a 6-8hp would be plenty on a 15-17 hull.
Fishmore posted 04-07-2009 08:54 PM ET (US)
I found 6hp to be the just right combination of power and weight for my 73 16' hull.
AZdave posted 04-09-2009 02:09 AM ET (US)
That is probably more horsepower than you need. My 18 Outrage goes only 1/2 mph faster at full throttle than at half with a 9.8hp. The speed was measured with a GPS, but I'm judging RPM by ear. This test was done in calm conditions with minimal winds. In a headwind with conditions deteriorating toward snotty, you might be glad you have the extra horsepower. Dave
jimh posted 04-09-2009 08:42 AM ET (US)
The bracket is apparently made according to the plans shown in
Auxiliary Engine Bracket for 15-foot Boston Whaler Boats
http://continuouswave.com/whaler/reference/bracket15AuxMotor.html
gyzmo47 posted 04-11-2009 12:11 PM ET (US)
Yes Jim my bracket is made exactly to those specs. As the article does not suggest a maximum h.p. rating but does mention the 6 h.p. I think I will look for another motor rather than using my 9.9 as a kicker.

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Author	Topic: SPORT 15 Auxiliary Engine Bracket Rated Power
gyzmo47	posted 04-07-2009 11:51 AM ET (US) I have a kicker motor bracket on "The Gyzmo" which was made as per the description in the reference section for the 15 foot whaler transom. I have read that almost any h.p. rating will work but I will be using the boat in the Great Lakes and would like more than just minimum push and was wondering if my 9.9 (older 2 stroke) will be to much torque for this bracket.
Tohsgib	posted 04-07-2009 12:18 PM ET (US) Should be fine but may be overkill. Try it but I think a 6-8hp would be plenty on a 15-17 hull.
Fishmore	posted 04-07-2009 08:54 PM ET (US) I found 6hp to be the just right combination of power and weight for my 73 16' hull.
AZdave	posted 04-09-2009 02:09 AM ET (US) That is probably more horsepower than you need. My 18 Outrage goes only 1/2 mph faster at full throttle than at half with a 9.8hp. The speed was measured with a GPS, but I'm judging RPM by ear. This test was done in calm conditions with minimal winds. In a headwind with conditions deteriorating toward snotty, you might be glad you have the extra horsepower. Dave
jimh	posted 04-09-2009 08:42 AM ET (US) The bracket is apparently made according to the plans shown in Auxiliary Engine Bracket for 15-foot Boston Whaler Boats http://continuouswave.com/whaler/reference/bracket15AuxMotor.html
gyzmo47	posted 04-11-2009 12:11 PM ET (US) Yes Jim my bracket is made exactly to those specs. As the article does not suggest a maximum h.p. rating but does mention the 6 h.p. I think I will look for another motor rather than using my 9.9 as a kicker.