Proper Prop for O.S. 60 FSR - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-02-2009, 08:43 PM   #1
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I am: Eduardo Galiano
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Proper Prop for O.S. 60 FSR

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Hi Everyone: I have a .60 sized old time F3A plane called the Vertigo in which I mounted a brand new 1970's vintage O.S. 60 FSR with Perry pump & carb. So it is an old time pattern airframe with a correspondingly old time powerplant. My question is this: what would the recommended prop size(s) be for this combination? Remember, this engine came out before the so-called long stroke engines made the scene. Right now I have an APC 11 x 7 in there, but I've never flown it in that configuration. Thanks for the suggestions.

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Old 02-02-2009, 08:49 PM   #2
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Re: Proper Prop for O.S. 60 FSR

Yes Eduardo,

Good start but the Vertigo is quite streamlined as you know from your pattern ships.
So it will unload quite a bit in the air.
You can step up to an APC 11 x 7.5 or 11 x 8 no problem in this configuration

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Old 02-02-2009, 09:16 PM   #3
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Re: Proper Prop for O.S. 60 FSR

As per Cassat's suggestion an 11 x 7.5 will work fine. But based on my old FSR's 11 x 8 is a bit much. Also APC are not the best props for these motors.
They had rather short crankshafts and the APC has a fairly thick hub so there is not a lot of thread for the prop nut with the prop washer installed.
You may be better off with a good wood prop. TF or Zinger works great for me on my FSR's.
Also my older OS motors like nitro and run great on 15% heli fuel with castor.
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