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Subject: Re: [worldcruising] Autoprop
dblanc6798@XXX.XXX
Date: Tue Feb 05 2002 - 01:07:38 EST
I installed a three blade auto prop on our 40' Brewer sloop "Augusta" two
years ago. The power train includes a 46 HP Westerbeke diesel with a Hurth
V-drive, the auto-prop has a 19" diameter. The performance figures below
were taken with much of our heavy cruising supplies off the boat, around
23,000 lbs. I have noted the following improvements in performance under
power.
New max. 2600 RPM, 7.9 knots
Old max. 2600 RPM, 7.1 knots
Old cruise speed at 2450 RPM 6.5 knots
New cruise speed at 2250 RPM 6.5 knots
I have seen no real change backing our boat down, she never pulled hard to
port with the old fixed three blade either so I guess their was not a lot of
room for improvement here. I have noticed a considerable increase in
emergency backing power, I can stop the boat in half the distance of our old
fixed three blade.
I am very pleased with the performance of this prop, I wish I had installed
one prior to our Seattle-Sydney cruise a few years ago. I could have saved a
lot of fuel and wear and tear on the engine given the lower cruise RPM. It
is surprising how this prop performs at lower Rpm's on flat water. At 1500
RPM we can poke along at 5 knots as long as their is no head sea. I can't
help but think how nice this would have been on one leg of our last cruise
that had us becalmed north of the Cook's for three days.
As I recall, the prop was expensive, around $2,800 for the whole thing.
Best regards,
Dan Blanchard
SV Augusta
Everett, WA
[Non-text portions of this message have been removed]
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