Quote:
Originally Posted by ss3964spd
Can you explain further? When it goes to 3500 and "losses plane" are you saying the boat falls off plane?
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I was trying to wrap my head around the same thing. Technically, the RPM's aren't what get you on plane, it's the speed. If you disagree, then put the motor in neutral and crank her up to any RPM and see how fast you're going. LOL
. More important would be the speeds and the RPM relationship. For example, the slower my boat is going, the more tab IN I need to keep the boat on plane. Below a certain speed, she starts to drop off plane. The wind, tide, current, and sea state will dictate the amount of RPM's required to maintain a given speed. So, all things are a bit relative.
What you describe is the boat is on plane 2,200 RPM's, which in itself seems very low. Then at 3,500 rpm's she drops off of plane? Where are the speeds at 2,200 and 3,500 respectively? Does the boat rpm's drop dramatically once they hit 3,500 rpm's?
The only thing I can think of is a spun prop hub. Theoretically, if the hub is toast, you 'might' be able to maintain bite at lower RPM's, but at higher rom's the hub can no longer maintain grip and the shaft spins inside of the hub. This would reduce the amount of usable torque being transferred to the prop. The engine RPM's are spinning away, but the prop is not rotating at the relative RPMs's to maintain bite in the water.
I'd have the prop pulled and taken to a prop place to have them inspect the prop hub and replace if necessary.