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All Forums >> RC Airplanes >> ARF or RTF >> ys.91fz
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ys.91fz - 12/17/2002 8:01:22 PM   
VKerster


 

Posts: 266
Joined: 12/14/2002
From: highland, MI, USA
Status: offline 		Am using a master airscrew 16x6 on a ys.91fz and turning 8700 to 9000rpms. Thrust cacluator says 16lbs of thrust. Using this combo on a h9 p-51. Pulls like a 747.

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VKerster
       Post #: 1

ys.91fz - 12/17/2002 9:18:26 PM   
bla bla


 

Posts: 1580
Joined: 9/19/2002
From: Oslo, NORWAY
Status: offline 		Well there you go... and remember a Master Airscrew is a pretty grim propeller.

(in reply to VKerster)
       Post #: 2

ys.91fz - 12/18/2002 12:58:26 AM   
Richard L.



Posts: 8775
Joined: 7/28/2002
From: Redmond, WA, USA
Status: offline 		You might want to try a Graupner prop. It will give you better performance.

(in reply to VKerster)
       Post #: 3

ys.91fz - 12/18/2002 4:11:47 AM   
seanychen



Posts: 2914
Joined: 7/20/2002
From: Canton, MI, USA
Status: offline 		Try 0.6 for the CF on the calculator. 1.0 CF is assuming 100% efficiency. APC gets like 70%, and MA is like 60%. So pick "custom" prop, and put 0.6 or 0.7 for the CF. That will be more like the real result. I correlated with other people's thrust scale reading to get this approximation.

For the YS 91, the mfg recommends keeping the peak rpm at abotu 10k, so you'd achieve this with a 15x8 APC.

(in reply to VKerster)
       Post #: 4

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