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YS 91 Four Stroke

Old 07-03-2004, 10:25 AM
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wood
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Default YS 91 Four Stroke

Please post your YS 91 tachometer readings here please.
Old 07-07-2004, 11:36 AM
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Richard L.
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Default RE: YS 91 Four Stroke

8800 rpm with Graupner 15x8 prop and Powermaster YS 20/20 fuel.
Old 07-07-2004, 09:55 PM
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wood
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Default RE: YS 91 Four Stroke

Richard, is that a wood prop? Thanks, wood.
Old 07-07-2004, 10:49 PM
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Richard L.
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Default RE: YS 91 Four Stroke

No, that's a super nylon prop, one of the most efficient props out there: [link]http://www.hobby-lobby.com/grprop.htm[/link]

I don't believe Graupner makes wooden props.
Old 07-28-2004, 07:12 PM
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Default RE: YS 91 Four Stroke

YS .91FZ

YS 20/20

MAS 15x8 = 8800-8900 (wide blade prop with lots of braking affect)
APC 15x6 = 9500 (great pulling power)
APC 14x6 = 9900-10,000 (hovers easier) I think it spool up a little faster

+/- 100 RPM
Old 07-28-2004, 09:30 PM
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rony
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Default RE: YS 91 Four Stroke

mine
NX wood prop. 14 x 10 9,500rpm
Old 08-09-2004, 06:48 PM
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abacro
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Default RE: YS 91 Four Stroke

I have 3 ys 91's.

2 are the standard 91ac versions,and 3rd is the helicopter version.First 2 run happily at 10,000 rpm on ground turning Gruptner 14/7.5s,and the last turns a 14/8 master airscrew at 10,200 rpm. I'm running Byron YS20/20 fuel in all 3,and 2 have the OS type F plug,while the 3rd runs perfectly on a Fox RC long idle bar plug.

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