The manual for my Universal M15 (11 hp) states a freewheeling prop is permitted. If locked it should be in reverse. John Jennings
In a message dated 9/8/2009 7:53:07 P.M. Eastern Daylight Time, [email protected] writes: Generally speaking, "folders" have their key way milled in such a way that when it's on the top or bottom the hinge pin is in the vertical position. Further the shaft has it's key way milled in the same position on both ends. If you can see the key way at the transmission end you can just line that up. Feathering props are very much the way to go.if you can spare the bucks! They provide the same thrust in reverse as they do in forward and can be "fine tuned" for each boat/owners "style". On the down side, they like to be kept clean and lubed to work at their best. As far as the argument that a "locked" fixed prop is less drag, I (as well as the big multihull guys) disagree. When the water flow strikes a fixed prop, the water must deflect around the prop.drag. When the flow strikes a "free wheeler", the prop deflects.less drag but more wear on the cutlass, stuffing box and in some cases, the tranny. Mark, Gratis (6115) NOLA From: [email protected]_ (mailto:[email protected]) [mailto:[email protected]_ (mailto:[email protected]) ] On Behalf Of Phil Agur Sent: Tuesday, September 08, 2009 6:10 PM To: [email protected]_ (mailto:[email protected]) Subject: RE: [IC27A] Re: new noise I think all the manuals say shift into reverse when under sail. Normally a folding prop requires a bit more work for high efficiency sailing. When you're on the hard or installing the folder you position the hinge pin vertical and then go below and mark the top of the prop shaft. When you convert to sail power you go below and position your prop shaft mark back on top again and then lock that position by shifting into reverse. The vertical pin position allows the blades to be swept to the folded position with gravity providing a little boost. When the pin is horizontal one blade will fall into the flow and offer some drag. There are geared folders which don't care are prop position but they need to be locked as well. I think the high end feathering props take care of themselves but I also recall a statement about briefly reversing them as well to get the blades set with the flow. Phil Agur <_http://www.catalinahttp://www.cathttp://www.catalhttp_ (http://www.catalina27.org/public_pages/profile270.htm) > s/v Wing Tip C270 LE #184 MMSI 366901790 -----Original Message----- From: [email protected]_ (mailto:[email protected]) <mailto:IC27A%mailto:IC27A%mai> [mailto:[email protected]_ (mailto:[email protected]) <mailto:IC27A%mailto:IC27A%mai> ] On Behalf Of Raymond L Yager Sent: Tuesday, September 08, 2009 10:03 AM To: [email protected]_ (mailto:[email protected]) <mailto:IC27A%mailto:IC27A%mai> Subject: Re: [IC27A] Re: new noise Putting it in reverse is also important if you are using a folding prop. My understanding is that it won't fold if you don't lock it off in reverse. Ray Yager S/V Stars & Stripes #6354 On Sep 8, 2009, at 10:49 AM, dsavlin wrote: > > Dunno how significant this is, but in my Universal M-15 manual, it > states in all caps, underlined, and bold letters, never to put the > transmission in forward gear while under sail; always use reverse > gear, > if you do not want the shaft to spin free. > > On Persephone, we do this to reduce wear and tear on the cutlass > bearing > and the packing gland. It probably costs us a small amount of speed > but > we're pure pleasure cruisers so we don't care. Our cutlass and packing > gland are both still in fine shape after 7 years of ownership. > > David > Persephone, '88 C27 > > --- In ic...@yahoogroups. <mailto:IC27A%mailto:IC27A%mai> com, "new_horizons_"new<new_horizons_new_ho> > wrote: > > > > If it is not your prop shaft spinning free, it is most likely your > cutlass bearing rattling within its strut, which indicates that it's > failing and needs to be replaced. I had the same noise when mine was > failing. It sounded very much like the prop was free-spinning under > sail. > > > > --- In ic...@yahoogroups. <mailto:IC27A%mailto:IC27A%mai> com, "sharon_speller" unclesharon@ wrote: > > > > > > I had a new mystery noise coming from the stern cowling that is > connected to my blower hose. The noise happens when i am under sail, > engine off. All batteries are off. If im at the dock nothing. it > sounds > like a motor whirling. the noise is coming from behind the engine. > Near > the transmission and prop..... I think. > > > Could it be the prop? never had it happen before today. > > > thanks. > > > > > > > [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] [Non-text portions of this message have been removed] [Non-text portions of this message have been removed]
