If your Gori is sized properly based on the engine, transmission and clearance
(all likely given your performance), you probably have the lowest drag
propeller available.
Tests years ago on propeller drag in a water tank(published in Yachting
magazine) showed that the Gori had the least drag of any ~ 20 brands that were
tested. You can probably get better performance
with others in terms efficiency under power (reverse or forward), but you would
be hard pressed to get a prop with less drag when sailing.
Charlie Nelson
1995 C&C 36 XL/kcb
cenel...@aol.com
-----Original Message-----
From: james via CnC-List <cnc-list@cnc-list.com>
To: David Morris via CnC-List <cnc-list@cnc-list.com>
Cc: james <jtsai...@gmail.com>
Sent: Wed, Oct 31, 2018 3:44 pm
Subject: Re: Stus-List Propeller Sizing
David,
I'm a fellow Afourian and I would say that the performance you are getting
is impressive for a folding prop. My question with your setup is what
happens in chop and waves? If you are satisfied with the rough weather
performance and you want to stay with a folding prop, I don't think you
would be able to do much (or any) better than what you have. The Indigo
prop is very popular for direct drive A-4's and would give a substantial
boost in rough weather performance. It would also increase the longevity
of your engine by reducing the loads. Just for your information, My a-4
has a reduction gear and a 16x10 two blade fixed prop. Wide open
throttle is 3200rpms and 6.5 knots. Cruise is 2500-2700 rpms (depending on
the skippers mood) and 6-6.2 knots. Rough water really kills performance
and I usually motorsail with the main. Joe is right on the money...
James Taylor
Delaney
1976 C&C 38
Oriental, NC
On 10/30/2018 10:04 AM, David Morris via CnC-List wrote:
I determined at haulout this weekend our newly-acquired 1975 C&C 30
MKI, Atomic 4, direct drive is equipped with a Gori two-blade folding
prop, measuring approx. 11.5”. I have neither the experience or
expertise to know if this is a great prop for the boat, a lousy one,
or, more likely, somewhere in between. After a major tune-up on the
engine, we seemed to be able to run at around 6.2 knots in
relatively calm water. Any advice, suggestions, observations anyone
would care to offer on prop selection would be much appreciated.
David J. Morris, MBA
President, D.J. Morris & Associates Ltd.
427 Division Street, Kingston, ON Canada K7K 4A8
Tel. 613-531-4429
email: djmor...@djma-ltd.com
Member: Professional Writers Association of Canada
Blogging at: http://davidmorrisjourneys.wordpress.com/
Virus-free. www.avast.com
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Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
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_______________________________________________
Thanks everyone for supporting this list with your contributions. Each and
every one is greatly appreciated. If you want to support the list - use PayPal
to send contribution -- https://www.paypal.me/stumurray
