[C320-list] Maxprop RPM v. boat speed

[Richard A. Walker]

To Low a pitch.

I get 7.1 kts at about 2800 RPM with my AutoProp.  It is self pitching so
does not harm the engine.

I have about 750 hours on the engine over 9 years.

Cheers,
 
Dick Walker
C-320 (687) WindWalker II
740 Olive Ave.
Coronado, CA 92118-2136
619.435.8986

-----Original Message-----
From: c320-list-bounces at lists.catalina320.com
[mailto:c320-list-bounces at lists.catalina320.com] On Behalf Of Sea Chalet
Sent: Wednesday, April 01, 2009 5:07 PM
To: C320-List at Catalina320.com
Subject: [C320-list] Maxprop RPM v. boat speed

I've got a Maxprop on my 2001 C320 with the 3GM30 engine.  I'm wondering 
if I have the pitch set properly to achieve maximum boat speed and 
engine RPM.
This is what I measured (avg. of opposite directions):
2000 rpm - 4.3 kn
2500 rpm - 5.3 kn
3000 rpm - 5.8 kn
3200 rpm (max.) - 6.1 kn.
How does this look?   Should I be getting higher speed with higher max. 
rpm?  Are there any other resources out there to check?
Thanks, all.
Pete Peterson
Sea Chalet
#815