Gary,
I have a Flex-o-Fold also, and if I don't "lock" it, it will continue
to spin. I use reverse.
Gary
S/V Kaylarah
~~~~~~~_/)~~~~~~
On Wed, Jun 8, 2016 at 3:26 PM, Gary Nylander via CnC-List <
cnc-list@cnc-list.com> wrote:
> I used to have a Martec. I always moved the shaft to the horizontal prop
> position to assure the blades both folded, or one could end up with a
> ‘hanging blade’ and you know how much that means!
>
>
>
> Now I have a Flex with gears – it folds in any position, and I doubt that
> it must be stopped, as the forward motion of the boat will push the blades
> backward, causing them to fold as long as the shaft is not being powered.
> I’m sure stopping it would help a lot. I have been leaving my Yanmar in
> forward for 22 years with no problems (knock on wood).
>
>
>
> Gary
>
>
>
> *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of *ALAN
> BERGEN via CnC-List
> *Sent:* Wednesday, June 8, 2016 2:49 PM
> *To:* cnc-list-requ...@cnc-list.com <cnc-list@cnc-list.com>
> *Cc:* ALAN BERGEN <trya...@alumni.usc.edu>
> *Subject:* Re: Stus-List (no subject)
>
>
>
> For a folding prop, you do have to stop the shaft in order for it to
> fold. You also have to center it (blades in the horizontal position) for
> both of them to fold. With feathering props, you shift into reverse, the
> shaft turns and the prop feathers.
>
> Alan Bergen
>
>
>
> On Wed, Jun 8, 2016 at 11:20 AM, Josh Muckley via CnC-List <
> cnc-list@cnc-list.com> wrote:
>
> Gary,
>
> I believe the list has addressed this before but I'll throw it out there
> again.
>
> A freewheeling prop has less resistance than a fixed one. There are a few
> assumptions being make in that statement.
> *Fixed blade prop
> *No shaft driven generator/alternator.
>
> The navy does it regularly. As a throttleman onboard an aircraft carrier
> with 4 shafts, I can tell you, a trailing shaft always required less
> compensation than a fixed shaft. The only reason we ever stopped the shaft
> was to do maintenance/repairs on the main engine or because of a shaft seal
> failure. The emergency shaft seal would be ruptured if the shaft was
> allowed to spin.
>
> As for our boats with featuring/folding props you have to stop the shaft
> in order to allow the prop to feather/fold. As others have mentioned you
> may have to shift into reverse to feather the prop. Staying in reverse
> ensures that the prop doesn't "re-feather" and start spinning again.
> Pretty unlikely. I occasionally forget to shift into neutral when
> starting... Oops!
>
> Josh Muckley
> S/V Sea Hawk
> 1989 C&C 37+
> Solomons, MD
>
> On Jun 8, 2016 9:48 AM, "Tom Buscaglia via CnC-List" <
> cnc-list@cnc-list.com> wrote:
>
> Aside from drag, I don't see what harm having it is neutral could do to
> the mechanical systems. That said, if I recall correctly, the MarTec prop
> folks suggest putting it in reverse temporarily to rotate the prop blades
> into a neutral position...but that could just be something I imagined.
>
> Tom Buscaglia
> S/V Alera
> 1990 C&C 37+/40
> Vashon WA
> P 206.463.9200
>
>
> > On Jun 8, 2016, at 9:06 AM, cnc-list-requ...@cnc-list.com wrote:
> >
> > Message: 6
> > Date: Wed, 8 Jun 2016 09:05:42 -0400
> > From: David Knecht <davidakne...@gmail.com>
> > To: CnC CnC discussion list <cnc-list@cnc-list.com>
> > Subject: Re: Stus-List Transmission in forward or reverse while
> > sailing?
> > Message-ID: <cc3239bb-3ac8-46c7-9c72-c0a940bd3...@gmail.com>
> > Content-Type: text/plain; charset="us-ascii"
> >
> > Mine recommends reverse but also says the transmission will be damaged
> if left in forward. Not sure why. Dave
> >
> >> On Jun 8, 2016, at 7:16 AM, Gary Russell via CnC-List <
> cnc-list@cnc-list.com> wrote:
> >>
> >>
> >> The answer may depend on what make of transmission you have, but my
> Hurth transmission recommends reverse. If your prop is spinning in
> forward, I would suggest that is not good. I would recommend reverse.
> Some transmission, I'm told, have the oil pump on the input shaft, so there
> is no lubrication when the engine is stopped. That's one reason you want
> to make sure the prop is not free-wheeling. The other reason, of course,
> is drag.
> >>
> >> Gary
> >> S/V Kaylarah
> >> '90 C&C 37+
> >> East Greenwich, RI, USA
> >>
> >>
> >> ~~~~~~~_/)~~~~~~
>
>
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>
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> _______________________________________________
>
> This list is supported by the generous donations of our members. If you
> like what we do, please help us pay for our costs by donating. All
> Contributions are greatly appreciated!
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>
>
> _______________________________________________
>
> This list is supported by the generous donations of our members. If you
> like what we do, please help us pay for our costs by donating. All
> Contributions are greatly appreciated!
>
>
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