The type of prop and reduction gear (transmission) makes a difference between sailing in gear or not.
A fixed prop will often cause the shaft to spin resulting in damage from lack of lubricant. Some boats have a shaft brake installed. A folding prop will rarely cause the shaft to spin. A feathering prop will likely need to be stopped in gear (engine running with some reduction gears) to hold the shaft long enough for the blades to feather. A sticky feathering prop may induce shaft rotation. Some boats have a shaft brake installed. On Calypso with a 3 blade MAX Prop and a Borg Warner velvet drive reduction gear we get the boat up to speed (4 to 5 knots typically) and shut the engine off in gear. When sailing, with the prop feathered we leave the reduction gear in reverse to keep the shift lever out of harm's way. The reduction gear being hydraulic will not lock the shaft but once the prop is feathered the shaft does not rotate. I recommend you follow the owner's manual regarding the in or out of gear selection. If you hear the sound of the shaft spinning it almost always indicates some action is necessary to prevent damage from lack of lube. Martin Calypso 1971 C&C 43 SEattle ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Rich Knowles Sent: Thursday, September 06, 2012 10:09 AM To: [email protected] Subject: Re: Stus-List Martec Folding Prop Operation Just read the advisory note. Interesting. Other transmissions don't like the shaft turning when the engine is off as the tx oil pump runs off the input shaft and lubrication stops when the engine stops. Rich Rßdë On 2012-09-06, at 13:05, Joel Aronson <[email protected]<mailto:[email protected]>> wrote: With a fixed prop you are putting pressure on the bearings to turn the shaft the other way. I would think that you are also increasing drag. Didn't seem like a big deal to me until I found out it voids the warranty. Either Yanmar is looking to reduce warranty liability or there is really something there. Joel On Thu, Sep 6, 2012 at 12:00 PM, Rich Knowles <[email protected]<mailto:[email protected]>> wrote: Why can you not sail with the gear box in reverse? I e done that for years to keep the shaft from spinning when underway and trashing the bearings in the tx. Rich On 2012-09-06, at 12:38, Joel Aronson <[email protected]<mailto:[email protected]>> wrote: My Martec will vibrate if it is not in the right position. I put the gearbox into reverse for a second or two and the vibration stops. I assume it is in the feathered position. (Don't sail with the gearbox in reverse.) Joel 35/3 The Office Annapolis
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