It sounds like your prop is screwing itself into the mud, acting like an
anchor. You need at least 3 1/2 feet to move at dead ahead speed.
Jim
wrote in message
oups.com...
So is the increase in engine RPM without acceleration of the boat
caused by cavitation?


NOYB wrote:
When you accelerate in shallow water, the bow rises, and the skeg of the
outdrive lower unit gets thrust down into the bottom. You're dragging
bottom.

The solution:
find deeper water before accelerating.

Or you can use a trick the flats boats use down here. Cut the wheel hard
to
starboard, hit the throttle, and the moment the boat starts to pop on
plane,
immediately cut the wheel back to center and continue on your way.



wrote in message
ups.com...
I bought a used boat (Four Winns Liberator 211) and I have noticed an
odd behavior. When I am in shallow water and I attempt to accelerate,
the engine revs but the boat does not accelerate like it should. It
feels like the prop is not spinning like it should be for the given
RPM, and then it may or may not catch allowing the boat accelerate
forward. When in deeper water, this never happens. This is only an
issue because I live on a channel and have to go through shallow water
to get to the lakes. Is this normal or any ideas on what might be
wrong? The shallow water is muddy but I don't believe there are any
hard obstructions (rocks, etc.)

Thanks for any help.

wrote in message
oups.com...
So is the increase in engine RPM without acceleration of the boat
caused by cavitation?

No. Your outdrive is "anchoring" your boat to the bottom. It's like trying
to accelerate while tied to the dock.

You're stuck in the mud.