SUPER SPORT 15 with F70 on Jack Plate

Optimizing the performance of Boston Whaler boats
dtmackey
Posts: 752
Joined: Thu Sep 28, 2017 9:29 pm

SUPER SPORT 15 with F70 on Jack Plate

Postby dtmackey » Wed Jul 28, 2021 9:44 am

I finally had time to get some data on boat performance after the engine break-in on my Super Sport 15 with 2020 Yamaha F70 with eight hours.

Testing with 13-gallons of fuel, 125-lbs of gear, the jackplate at full raised position of six inches, and stainless 17-pitch propeller (but I think it’s closer to 18-pitch):

Top boat speed was 45.1-MPH at engine speed 6,300-RPM and on the rev limiter.

The test was in fresh water with no wind or current and speeds are GPS speeds over ground in the same area, back and forth.

The boat has bottom paint, so I’m thinking there’s still more if I run a lighter load and another propeller.


Having the motor jacked six inches above the transom lip is ideal: no problems although a propeller better designed for surfacing may provide better top end boat speed.

The Anti-Ventilation plate is clearly visible.

In the illustrations below my son is running the SUPER SPORT 15 at about 30-MPH and the F70 engine is NOT trimmed up. The boat exhibits zero chine walk and was rock solid.

Image

Image

Image

Image

Image

D-

Schuyler84
Posts: 57
Joined: Sun Dec 29, 2019 10:20 am

Re: SUPER SPORT 15 with F70 on Jack Plate

Postby Schuyler84 » Wed Nov 30, 2022 7:58 pm

Q1: which make and which model jack plate did you install?

User avatar
Phil T
Posts: 2343
Joined: Thu Oct 22, 2015 6:08 pm
Location: Was Maine. Temporarily Kentucky

Re: SUPER SPORT 15 with F70 on Jack Plate

Postby Phil T » Wed Nov 30, 2022 8:09 pm

Mackey-

Please edit your post and add the make and model of the prop.
1992 Outrage 17
2019 E-TEC 90
2018 LoadRite 18280096VT
Member since 2003