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YS heli engines

Old 12-08-2007, 10:40 PM
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kaui12
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Default YS heli engines

Can the YS 2 stroke heli engines be used for airplanes? Will a prop thrust driver for a .61 airplane engine fit on the larger(.91) heli engine, or is there a difference in crankshaft diameter, or some other mismatch? I'm thinking of using the .91 and a speed prop in a Patriot XL. I want the benefits of large displacement and a regulated fuel system in a proven package. Thanks!
Old 12-08-2007, 11:24 PM
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Troy Newman
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Default RE: YS heli engines

The problem is the shafts are much shorter length. You may have trouble doing it.

I have no experience with doing this and don't recommend it.


Troy Newman
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Old 12-10-2007, 01:21 PM
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sydc
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Default RE: YS heli engines

Hi,

I have converted the YS91st to an aero engine, works very well. Here are the YS spares that you require.
Drive washer retainer - YS spare part no. F9324
Drive washer - YS spare part no. F9323
Tru Turn 8x1.0mm short shaft double jam kit - Tru Turn spare part no.TT-0813-A
Hatori manifold and pipes fit ok.
Hope this helps.
Regards,
Sydc.
Old 12-11-2007, 08:46 PM
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kaui12
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Default RE: YS heli engines

Thankyou sydc! That was exactly the answer I was looking for. How did you prop it as far as size?
Old 12-12-2007, 03:57 PM
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sydc
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Default RE: YS heli engines

Hi,
I used an APC 13x7 which gave about 11,800 rpm with pipe on YS 20/20. Exceptional power with this setup, fitted in a Dave Smith Excelsior 177.
Old 12-12-2007, 10:12 PM
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kaui12
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Default RE: YS heli engines

That definitely sounds like the way to go. Those numbers are real healthy for a .91 and leads me to think a more square prop like a 12x10 also might be worthy of consideration as long as it doesn't bog things down enough to cause the engine to drop off the pipe. I suspect the engine will work just fine as it unloads in the air. This is going to be a great combination and plenty fast. I bet the rate of fuel consumption will end up leading me to use multiple tanks. I love it when a project starts provoking my adrenal glands even before construction starts![sm=bananahead.gif]

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