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Subject: Re: [worldcruising] To John on Truelove
MorningStar@XXX.XXX
Date: Fri Aug 25 2000 - 12:02:36 EDT
Bob:
It's actually Jim. I jumped into your dialog about the Martec feathering prop. A picture of it is
located: http://www.seahawk.com.au/
I used an 18" because that's what specked out with the Yanmar 44 hp engine and 45' trimaran. The prop
has only the required room in between the back of the prop hub and the face of the strut to
accommodate the Spur cutters. From the back of the strut, to the shaft log, I have over 2' so I have
no issue there. Martec should be able to answer your question?
Feathering or folding? I took out a ($22 k) West Mekan hydraulically operated "feathering" 3-blade
prop set up. It is a controllable variable pitch prop. For your reference...
(http://www.baat.aller.no/bu/westmekan.html#anchor133555)
The Martec and others of like kind are folding. They fold when under sail. And they open to a fixed
position when under power. So to me they're folding. You can't adjust the pitch while motoring, which
should be feathering?
Jim
Bob Taylor wrote:
> John
> Thaks for the reply. How come a 18". I use a 20" fixed three blade. I was planning on a 20"
> Martec.
> How close is your shaft end to the shaft log. Mine has room for two collar type zincs between the
> fixed prop and the log with about an inch to spare. I am just trying to figger if I will need to
> cut the shaft.
> You wrote "folding". Did you mean "feathering"? Yes I know I wrote folding also.
> Thanks
> Bob
>
> MorningStar@XXX.XXX wrote:
>
> > Bob:
> >
> > You do need the clearance that Martec Engineering told you about for correct operation of their
> > "AutoStream" 3-blade folding prop. That is just how it's made.
> >
> > For the money, the AutoStream is the way to go. It has all the options that the others charge
> > up to twice the money for. I installed an 18" 3-blade on my last haul out. I like it a lot.
> >
> > I would suggest installing some type of crab pot protection at the same time. Very cheap
> > insurance. I installed a "Spur". It's well made and works as advertised. There are cheaper ways
> > to go and perhaps achieve the same effectiveness of cutting unwanted debris from your aft
> > underwater end. There's a round blade system from Canada and an other similar type from
> > England.
> >
> > Jim
> >
> > Bob Taylor wrote:
> >
> > > Hi John
> > > I have been talking to Marteck about a folding prop. They have brought up a point that you
> > > need 11 inches between the end of the threads on the shaft and the rudder or other
> > > obstruction behind the prop.
> > > I vaguely remember you recently installed a feathering prop on Truelove.
> > > Did you have this to deal with. Did it fit without modifying your shaft. Was yours a
> > > Marteck or what.
> > > Bob sv Adagio
>
>
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