Sounds like a hook in the hull to me. A boat like this can be downright
dangerous at times.

Is the boat stored on a trailer?

Rob
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"JG" wrote in message
.. .
I have a 1968 14ft fiberglass Thundercraft Sprint runabout which is
outfitted with a '68 Merc 35hp shortshaft outboard & a new 3 blade 13p
prop.

I had put stabilizer fins on the motor to help it plane and it actually
slowed the boat down & made things worse. After removing them I regained
some speed but the weirdest thing happens (hence the reason why I tried
the
stabilizer fins to begin with). When you initially hit the throttle the
boat
rises and gets on plane then once top speed is reached the nose dives and
the boat looses plane and starts plowing the water. I have the motor
angled
as far as possible on the mount bracket to lift the front end up but it
still does not get the boat on plane at top speed. Perhaps I am missing
something here? Maybe this has something to do with why the stabilizer
fins
would not work with my setup?
Any help would be appreciated.

Please remove the fifty-five from my address if responding via email.
Thanks!
Jason.