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 <mailto: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 <mailto: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 <tel:206.463.9200> > On Jun 8, 2016, at 9:06 AM, cnc-list-requ...@cnc-list.com > <mailto:cnc-list-requ...@cnc-list.com> wrote: > > Message: 6 > Date: Wed, 8 Jun 2016 09:05:42 -0400 > From: David Knecht <davidakne...@gmail.com <mailto:davidakne...@gmail.com> > > To: CnC CnC discussion list <cnc-list@cnc-list.com > <mailto: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 > <mailto: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 >> <mailto: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 >> >> >> ~~~~~~~_/)~~~~~~ _______________________________________________ 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! _______________________________________________ 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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