"A bit" doesn't sound like much. ;-)

You're right, just tossin' out ideas.

V-6, 3.8, 4.3 Litre "1980 thru" OMC Racker14.5x24 = 50-60mph!
Whole cow; that's fast batman

Atomic batteries to power...turbines to speed... g

Speaking of props, what material is yours? A few dings will make a
difference, but certainly not 10-15mph. A stainless prop gets a better
"bite" on the water, but is also very expensive (compared to aluminum). I
had a 22p stainless prop on my 4.3L 18' reinell, and she got to about 45mph.
Can you turn the prop by hand at all when it is in gear? I don't know if you
can "partially" spin a prop from it's hub, but if it's slipping under load,
that would certainly account for a lower top end. Slower out of the hole as
well.

--Mike


"Josh Assing" wrote in message
news
Going down a couple of inches in pitch will get you to the higher end of
your WOT RPM and should help out the top end a bit. Like I said something
else is keeping the speed down. Have you checked it with a GPS? It's
possible that you're going faster than the speedo shows.

"A bit" doesn't sound like much. ;-)

GPS verified speed as near accurate (actually slower than what was
reported on
the speedo, but considering the tide -- that would be expected)

Any ideas on what could keep the speed down by 10mph?

The original "Matched Options" book has this listed:

High Performance Propellers
V-6, 3.8, 4.3 Litre "1980 thru" OMC Racker14.5x24 = 50-60mph!

Whole cow; that's fast batman

But up 5" in pitch? yikes; that certainly would bog down & overwork the
engine.

The prop does have a few dings in the end.

A trial today with glass like water got me to 35mph @ 4600 rpm; so maybe I
will
go up in pitch


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