Hi Dave,
My prop is for all intents brand new and I occasionally get the big
vibration when I advance the throttle too quickly after shifting in reverse
but never in forward. Going back to idle and accelerating smoothly fixes
it.
As for how much play you might have I think the only way to know for sure
is to go for a quick dive and deploy the blades by hand / give them a
wiggle. I would call Martec to ask them how much play you're looking for.
I'd say less than 1/4 inch but I don't recall for sure. The Martec dude is
pretty cool and responsive, he'll give you the right answer and additional
advice. He really knows his stuff.
-Francois
1990 34+ "Take Five"
Lake Lanier, Georgia
From: "David Jacobs" <davidjaco...@comcast.net>
To: Jean-Francois J Rivard/Atlanta/IBM@IBMUS,
<cnc-list@cnc-list.com>
Date: 07/09/2014 12:51 PM
Subject: RE: Stus-List Folding prop horizontal vs vertical plane..
I have a Martec folding prop which when I come off the mooring operates
fine. However if I slow down or stop to pick up crew at the dock something
happens and it vibrates like crazy. It’s got to be that one of the blades
folded and the other didn’t and when I accelerate it still vibrates as
though the blade that folded does come out again. Both blades do deploy
when I put it in reverse but then one folds when I go into forward. Is this
how these folding blade props act when they have too much play? If anyone
has had that happen and then had it reworked by Martec did this problem go
away?
Dave
Saltaire C&C 35 Mk3
From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of
Jean-Francois J Rivard via CnC-List
Sent: Tuesday, July 08, 2014 1:14 PM
To: cnc-list@cnc-list.com
Subject: Stus-List Folding prop horizontal vs vertical plane..
My prop is folding, not feathering. On a non-geared folder If you have the
blades on a vertical plane, the lower blade will hang down from gravity /
add additional drag. On horizontal plane they fold together completely
(Looks like a seaweed) and minimize drag. If it's a geared folder, they
will fold completely no-matter the angle
That's per Martec's instructions. See comment about the Pivot point (Shaft)
being set vertical (Making the blades horizontal)
http://www.martec-props.com/install_eliptec.htm
As for the rebuilds, they are about a hundred bucks with Martec. They
re-drill the hub, install a larger diameter shaft, re-drill the blades,
balance and polish the whole thing. The prop looked brand new.
Call the MFG to get an idea if you are out of specs. My blades wiggled
more than 1 inch at the tips so it was pretty obvious..
-Francois Rivard
1990 C&C 34+ "Take Five"
Lake Lanier, Georgia.
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