prop pitch

[deerpaw]

just purchased 89 Alumacraft 16' Lunker w/ 2001 25hp johnson w/a 10x13 prop. I have a hard time getting on plane. Is the prop the wrong size & pitch?

 

[Irv964]

Re: prop pitch

just purchased 89 Alumacraft 16' Lunker w/ 2001 25hp johnson w/a 10x13 prop. I have a hard time getting on plane. Is the prop the wrong size & pitch?

Welcome to the site deerpaw and congrats on your new boat.
In order to get the info your after the prop pro's will need to know your max rpm that your motor is rated for and your max rpm and speed at full throttle, preferably done with a GPS.

Once that info is made available, they will be able to steer you in the right direction. Good Luck........Irv964

 

[Silvertip]

Re: prop pitch

I believe that boat is rated for a 50 HP motor max. That means your 25 HP is only 50% of the rated maximum. The rule of thumb is to not power a boat with a motor that is less than 75% of maximum. That means the boat should probably have no less than a 35 HP motor. So the real issue is too small a motor, not a wrong prop. A 10 x 11 prop will probably help get on plane, but you would need to be very careful about full throttle operation as the motor may over rev. Top speed would also be reduced. Without a tach you can't tell that. I would suggest that you install a "Tiny Tach". Easy to install and would be helpful.