Prop for my kicker help

[Dclucas66]

I recently acquired a 2000 evinrude 4 stroke 9.9 long shaft for free. It had some easy fix issues but now is running 100%. It was on a pontoon and has a 4 blade 10 x 9 prop on it. Took it out to do a little testing yesterday and are not thrilled with the result. I have a 1989 16 foot deep V tracker and its a little heavier than stock as i've added a metal truck box livewell and used 3/4" flooring when i redid the floors. It has 3 batteries on board and a big trolling motor. I hit 6 mph yesterday at full throttle but was achieving 5 at half throttle. Seems like its creating alot of power and water is moving but just not shoving the boat. I thought id get 7 or 8 mph at least. Any recommendations to a new prop? Maybe a 3 blade.

 

[steelespike]

What is the rated hp on the boat?
You need the rpm and gps speed.

 

[ondarvr]

Sounds like it's just too much boat for the motor. The difference between 1/2 throttle and full throttle is typical for an under sized motor. The prop you have may be closer to correct than you think.

 

[Sea Rider]

Without an induction tach installed, you're dead. Need to tach that 9.9 with current 4 blade prop & current load, then work from there maximizing a prop that revs around full wot max revs which are ?

Happy Boating

 

[Dclucas66]

I will see if i can get a tach on it. Thanks guys. I figured it has too much prop since it was on a pontoon.