SUPER SPORT 15 with 25-HP

Optimizing the performance of Boston Whaler boats
GNolan
Posts: 3
Joined: Fri Feb 26, 2016 10:07 am

SUPER SPORT 15 with 25-HP

Postby GNolan » Thu Jun 06, 2019 11:33 am

Hello to All. I have a 1976 Super Sport 15 that is completely stripped of its interior. I am in the process of reconditioning or replacing the Mahogany components. Soon I will mount a 1990 Mercury 25 tiller-steering engine to the SUPER SPORT 15. I have no idea of what performance I will get or what to expect. I just want to get on the water with this 25-HP engine for now.

Please tell me of your experience with [a SUPER SPORT 15 powered by a 25-HP tiller steered engine].

Share your thoughts with me.

Q1: Will a SUPER SPORT 15 with a 25-HP engine and a 200-lbs pilot be able to accelerate onto plane?

I hope to hear feedback on this question.
15SS 1984
Harpoon 5.2

jimh
Posts: 6617
Joined: Fri Oct 09, 2015 12:25 pm
Location: Michigan, Lower Peninsula
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Re: SUPER SPORT 15 with 25-HP

Postby jimh » Thu Jun 06, 2019 7:10 pm

GNolan wrote:Q1: Will a SUPER SPORT 15 with a 25-HP engine and a 200-lbs pilot be able to accelerate onto plane?


According to Boston Whaler, as listed in the REFERENCE article on the 15-foot hull, the minimum power to plane a 15-foot hull is 20-HP. See

http://continuouswave.com/whaler/reference/15/

Generally the specification for minimum power to reach plane is for the hull in a bare hull in very light condition, no extra gear, and a single crew.

flymo
Posts: 191
Joined: Thu Oct 22, 2015 2:58 pm

Re: SUPER SPORT 15 with 25-HP

Postby flymo » Fri Jun 07, 2019 7:25 am

Do you have a tiller extension? I suspect you'll need to get your weight well forward to plane off. Obviously the condition of the bottom will be a factor, as will having the right prop on the motor.

GNolan
Posts: 3
Joined: Fri Feb 26, 2016 10:07 am

Re: SUPER SPORT 15 with 25-HP

Postby GNolan » Mon Jun 10, 2019 2:48 pm

I am aware of the min hp spec from Boston Whaler and the possible need for a tiller extension. Long shot, but hoping for someone with real life experience using a 25 on a 15' Sport.
15SS 1984
Harpoon 5.2