Hi Chuck,
I had a similar situation with my old cruising
cutter with a Gori folding prop. At expected RPM
the cruising speed was ugly and the engine
chugged along like there was no load. Even worse,
in a marina I learn to go full speed in reverse just to get a wee bite.
In my investigation I found the prop's 18 x 12
expected performance was suitable for a 2:1
transmission. The installed tranny was a 3:1,
which is great for efficiency and performance but
only if the prop is sized right. I think it was
mistake when ordered (like 10 years earlier) but that is a whole 'nother story.
Do you know what degree pitch the current setting
is? I have a vague recollection a Max prop should
be around 14 degree for a 2:1 gearbox and hull
speed in the 6.5 - 7 knot range. But don't quote
me.. the last one I set up was maybe 4 years ago.
Cheers, Russ
ex-Sweet , 35 mk-1
At 09:15 AM 1/20/2019, you wrote:
I have a MaxProp classic, and a Universal 35 on
Daydream. The prop pitch appears very shallow,
and when motoring, seems to be slow. (from
memory of last September, 4.5 knots@ 2300rpms)
Any 37+ owners have this combination of prop and
engine, and happen to know the correct pitch for the MaxProp prop?
And cheers from the Michigan Fridge...-12 in the UP this morning!!
Chuck Saur
(517)-490-5926
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every one is greatly appreciated. If you want to support the list - use PayPal
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