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prop size for ys .91 fz

Old 06-25-2008, 04:28 PM
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spitfire66
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Default prop size for ys .91 fz

Hello,

I was just wanting to know what some of you guys are running for prop size on your 91 fz's. I am going to stick with a 3 blade and have been looking at graupner props. 14x7x3 is my primary choice. Anyone else second that opinion or should I go with a 15x8? I'll tach my engine after getting the prop, but I'd like to at least get close the first time to prevent buying a bunch of props. Thanks in advance.

Shannon
Old 06-25-2008, 06:37 PM
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petec
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Default RE: prop size for ys .91 fz

I never tried a 3 bladed prop on my any of my YS engines but I do have a 15X8 APC two bladed prop on a 91 AC that turns 9400 RPM using 20% Power Master. When I did play with 3 bladed props I was told to drop an inch in diameter or pitch, but consindering how my AC turns a 15X8 You could probably get away with that size in a three blade.

If my mind doesn't fail me the 91 should be in the 8800 to 9500 range.
Old 06-26-2008, 12:11 AM
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spitfire66
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Default RE: prop size for ys .91 fz

Thank you for the info. I am going to take a chance and buy the graupner 14x7x3. I'll let you all know on the numbers when I get the airplane built. With your numbers on the 15x8x2 I think a 14x7x3 should do fine. We'll see... Thanks petec

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