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  #1   IP: 64.202.159.150
Old 11-17-2007, 06:58 PM
jpmarshall jpmarshall is offline
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Martec Folding Prop

Greetings All,

I removed my 28 year old Martec folding prop and sent it in for a rebuild as I was having problems with vibration and slipping out of gear in forward. The blade size was 13 X 8 RH and they replied that this was oversize for the A4 and are recommending a 12 X 6 RH. I have read throught he other posts and I am still not clear on whether this is suitable or not for a 1979 C&C 27 Mk III.

Comments???

Thanks

Peter Marshall
Dryden Yacht Club
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Old 03-05-2008, 08:30 AM
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David Masury David Masury is offline
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I have a C&C 27 mk lll, with an atomic 4.... the prop I have is an 11 x 5....Martec... this moves the boat easily... and at 5 to 5.5 knots it will cruise all day.

David
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Old 03-05-2008, 02:07 PM
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daveinrenton daveinrenton is offline
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I have a 12 inch Flex-O-Fold prop and it has a lot of torque in forward. Same over water performance as Mr. Masury. As it is, when you put the gas to it, the prop walk is so pronounced, you have to really hang onto the wheel (in my Ericson 29) and can manage 6-7 knots but the engine is really working hard. She goes at 2-3 knots idling! A larger prop would be very strenuous on the engine even at low speeds would be my guess. Around 5-5.5 kts, the engine is at mid-power with manageable prop-walk. As Dave M said, "All day long."

Dave
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Old 03-05-2008, 08:50 PM
HerbertFriedman HerbertFriedman is offline
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Martec folding prop

Just a data point. My 1972 came from the previous owner with a 12x12 Martec folding prop. I could not get the engine to rev up more than about 1200 rpm. I changed to a fixed 2 blade, 12x8 and the engine revved up to over 2000 rpm and ran well in forward but terribly in reverse (1972 Tartan 30. I finally changed to the fixed three blade 10x7 from Indigo, now preforms great in forward and reverse.
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Orion C&C 33 (07-27-2018)
  #5   IP: 70.62.137.177
Old 03-06-2008, 11:04 AM
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msmith10 msmith10 is online now
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I have a C&C 30 which had a Martec folding prop when I bought it. I don't recall the size but I think it was 11 or 12 X 6 or 7. The performance was so bad I replaced it with a 11X7 fixed 2 blade which is much better. Better in forward and reverse and stays in balance. I would guess that your Martec is definitely oversized.
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Orion C&C 33 (07-27-2018)
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Old 07-15-2018, 03:29 PM
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Orion C&C 33 Orion C&C 33 is offline
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I have a C&C 33 with an Atomic 4... Prop Shaft 1" OD married to 16 x 12 Martec folding prop.

Cruise all day @ 1800 rpm...for 5 knots, with my engine temperature never exceeding 150 F
Fuel burn 1 litre / hr.

No issues revving my engine up to 2200 rpm to compensate for stronger tidal currents...

If you are slipping out of forward gear it is most likely that your forward pressure plate is in need of adjustment. I would try that before changing out your prop.

Good luck..

Cheers,
Mel

Last edited by Orion C&C 33; 07-15-2018 at 03:33 PM.
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Old 07-15-2018, 05:33 PM
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If you're turning a 16x12 you for sure have a reduction gear.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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