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picked up a never used, OS FS-61 4 stroke..

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Old 04-29-2008, 09:49 PM
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Sempiterna
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Default picked up a never used, OS FS-61 4 stroke..

Paid $50 for it.. Never used, still in original box, etc.

2 questions..

1) It is devoid of the throttle arm assembly. Where can I get a replacement for this?

2) what's a good ARF to match this engine (consider my altitude, 6500' (Denver area)) Would consider aerobatic, and or warbirds.. Moderate experience level.

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Old 04-29-2008, 10:27 PM
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chashint
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Default RE: picked up a never used, OS FS-61 4 stroke..

When it is all said and done this engine will almost be the equilavent of a 40 two stroke.
The power is different since you need to keep the rpm in check, I would not exceed 10.5 k and prefer to keep four strokes propped just under 10k. You can probably expect 9000 - 9700 rpm with a 12x6 prop.
I would try Tower Hobbies or the OS website for parts.

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Last weekend I was playing with props and I put a 12x6 on an OS 46LA and it spun 9500 rpm.
This was on a World Models Skyraider Mach II that weighs under 4 lbs.
I liked the 10x6 and 11x6 props turning more rpm a lot better than the 12x6.
I think any plane over 4 lbs will be to much for the engine to haul around.
I am in the Dallas TX area and we are at about 500' elevation.
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Old 04-30-2008, 08:16 PM
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carrellh
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Default RE: picked up a never used, OS FS-61 4 stroke..

Here is the parts listing for the carburetor
http://www.osengines.com/parts/xr45681000.html
I have no idea if any of the parts are still available
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Old 04-30-2008, 11:06 PM
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sscherin
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Default RE: picked up a never used, OS FS-61 4 stroke..

I had one of there in the 80's (I still have it)

I turned a 12x6 on it back then flying a 40 telemaster.
If I remember it turned 9500 rpm.

I had planned to put it into an Aero-works 40 size Edge 540

Up here I'd try a 12.25x3.75 APC prop on that plane and motor.
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