Switching to a Three Blade Prop - SailNet Community
 
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post #1 of 7 Old 03-28-2009 Thread Starter
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Switching to a Three Blade Prop

I have decided to switch to a three blade fixed prop from a two blade fixed prop for better performance while motoring. My Pacific Seacraft manual recomends a 17 x 10 three blade prop and I believe it is a right (not left) prop.

My questions:

1. Has anyone used a different prop (fixed), diameter or pitch, from the one PSC recommends?

2. Is it a right hand prop? I just want to be sure.

3. Other than MI Wheel, does anyone have recomendations of prop manufactures? I AM ONLY INTERESTED IN FIXED PROPS.

Thanks,

John L.

s/v Redfish
1988 PSC 34 #95
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post #2 of 7 Old 03-29-2009
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You might want to look into the rationale for any performance improvement from a three blade versus a two blade, assuming both are properly sized. If a two blade fits in your setup, simplying switching to a three will not have any particular benefit other than reducing your boat cash stadh.

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post #3 of 7 Old 03-29-2009
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My spare prop is marked AUSTRA 17R. My Yamnar Operation Manual in the specifications says, "Direction of rotation, Propeller shaft (Ahead), Clockwise viewed from the stern".

Bill Murdoch
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post #4 of 7 Old 03-30-2009
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I agree with Sailingfool. I ran a two blade on Asylum the whole time I owned her and compared results with folks with 3 blade props. I got all of the performance I needed from 2 blades. It seems that there would have been marginal improvement in performance under power in reverse, but that was never a big issue. With a two blade the boat would drive to hull speed and power through any weather. If you felt you needed a folding prop I could understand, although i was always a proponent of fixed blades and no moving parts.
Larry
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post #5 of 7 Old 03-30-2009
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When we purchased our PSC 34 a couple of years ago, it was equipped with a 3 blade Maxprop and we had a spare 17 x 10 RH 3 blade fixed prop. The Maxprop was set to 17 x 10 and we were not able to get the proper RPM's from our Yanmar, and we had a problem with overheating.
Last spring we reset the Maxprop to an 8 inch pitch and the RPM's are now good and no more overheating.
I can't tell you how the fixed 3 blade 17 x 10 prop will work for you, but the Maxprop set to 17 x 10 was too much pitch.
Steve S.
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post #6 of 7 Old 03-30-2009
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Steve, I don't have enough posts to send you a PM. Would you be interested in selling your old fixed 3 blade 17x10 prop? I am in desperate need of one.


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post #7 of 7 Old 03-31-2009
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When I repowered NiftyNickers (Beta 37 1/2 hp) I also switched to a 3 blade Sailor Prop from Campbell.Its a bit strange looking shape wise but it does put the power into pushing the boat and doesnt affect sailing at all.I know that it delivers more thrust than the 2 blade by the way the boat blasts thru headseas and she sails as fast as ever.
Good luck,
Dianne and Chuck Burke S/V NiftyNickers
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