On Mon, 15 Jun 2009 02:27:29 -0700 (PDT), den wrote:

NO WAY is the prop hub slipping. That would be 8000 rpms and ducks
swimming by you.
I vote for leaning out. BIG bubble in the fuel line, or the kid hooked
up a nitro bottle!
Den
48YF EAGLE

Nope. *The boat went from its normal 17mph WOT cruising speed up to 25mph in
an instant.

Very interesting. Unusual motor to say the least. Power required to
overcome viscous drag varies with the cube of the speed. So this
engine tripled the power while going from five grand to eight. All you
can get from nitrous oxide is double. If you supercharge and burn
methanol, in an engine designed for it, you might triple the power
going from five to eight.

It is would be more usual for power to drop going five grand to eight.
Matter of insufficient time for the cylinders to get a full charge of
air.

Casady