Originally Posted by rocks1664
I have a 24 ft Tamar 2000 fishing
boat with a displacement hull.
The engine is a Perkins
4108 with a Thamesway Marine
As others have mentioned the engine may be over powered for the job of moving your boat at its hull speed.
Tamar 2000 LWL 22.5ft = 6.37kts.
The standard engine fitted is usually around 35Hp MAX at 3000 RPM
Your Engine produces 51Hp at Max 4000 RPM
So, depending on the propeller's diameter and its pitch
, when you put your foot down , think of the analogy of doing a "wheely" on a powerful motor
cycle - too much throttle = bike wants to fly.
With all that extra power available , you should be able to comfortably achieve your hull speed at around 2000 RPM. Possibly a prop of a different pitch
should be looked into.
If your engine replaced a lighter engine at some stage, then this could also mean that the extra weight in the rear of the boat has altered the dynamics of the way she sits in the water under full power.