You are getting about what you should expect from that engine and boat
combination, so the propeller can't be too far away from optimum. Sailboats
equipped with Atomic 4s were typically equipped with a 2 blade fixed prop, 12"
in diameter by 6" pitch. The relatively shallow pitch as compared to a
I replaced my old Martec model 778, Dia and pitch 12 X 5, 2 blade
folding in 2008 with a Martec Mk III Eliptec 2-blade folding,
non-geared. However I do not believe Martec is in production any
longer. One of the big concern at the time was drag when racing and
hull clearance. It was my unders
inal Message-
From: james via CnC-List
To: David Morris via CnC-List
Cc: james
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
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 yo
AM
To: C&C
Cc: ALAN BERGEN
Subject: [EXTERNAL] Re: Stus-List Propeller Sizing
The prop diameter should be as large as possible while still clearing the hull
by a couple of inches. When you run the engine at full throttle, you should be
able to reach rated rpm. If the engine runs more th
The prop diameter should be as large as possible while still clearing the
hull by a couple of inches. When you run the engine at full throttle, you
should be able to reach rated rpm. If the engine runs more than 5% over
rated rpm, the pitch is too low. If the engine cannot reach rated rpm, the
pit
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 i
