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OS 61 FSR with MA 11x7.5

Old 04-05-2015, 06:48 PM
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Tbobflow
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Default OS 61 FSR with MA 11x7.5

After freshening up my old 61fsr and running a couple tanks thru it I measured the RPM and got 11,350ish out of it. I don't recall what it used to run and I don't think I have had a 11x7.5 prop before. Does that sound about right?

thanks!
Old 04-05-2015, 06:50 PM
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Tbobflow
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Oh, this is a ringed one. I don't know if they were all ringed, seems like maybe some were ABC.
Old 04-06-2015, 09:06 AM
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jamesroutledge
 
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Haven't tried mine, but these may help:


http://www.rcuniverse.com/forum/tach...os-60-fsr.html


http://www.rcuniverse.com/forum/tach...1-fsr-abc.html
Old 04-06-2015, 11:34 AM
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That sounds about right using the OEM muffler. So you are in the ballpark for what the engines can output.
Old 04-06-2015, 05:45 PM
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Tbobflow
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Thanks for the links, those were helpful. Yes, it has the stock muffler on it. I really dig the FSR.
Old 04-06-2015, 10:53 PM
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cclhuzhou
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I don't know if they were all ringed, seems like maybe some were ABC.
Old 04-07-2015, 05:34 PM
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JollyPopper
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Yes, some of the 61s were ABC, some ringed. The .60 FSR had a smaller crankshaft diameter and were ABC only. These are some of the finest engines OS ever produced.
Old 04-08-2015, 12:24 PM
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landeck
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Originally Posted by JollyPopper View Post
Yes, some of the 61s were ABC, some ringed. The .60 FSR had a smaller crankshaft diameter and were ABC only. These are some of the finest engines OS ever produced.
JollyP, the .60 FSR where ringed only and were released about 3-4 years before the .61 FSR series. I have one.

Bruce
Old 04-15-2015, 06:41 AM
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You could get this engine ringed or ABC, I have both. Unfortunately all of them are about worn out. I was able to get an ABC piston/sleeve from Shadel some time back and get superb performance from it. I wish I could find a couple more of them, best $90 I ever spent repairing an engine. As much as I like the FX series there's just something about the FSR's that appeal to me.

Rick H.
Old 04-16-2015, 05:49 AM
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Bax
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If you cannot find the piston and ring for a .61 FSR, the piston and ring from the .61 SF-N engine is the same part. That was the "short stroke" heli engine.
Old 04-17-2015, 09:32 AM
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blw
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Thanks, Bill.
Old 05-17-2015, 02:30 PM
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Tbobflow
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I ran this engine some more today, got 12,450 on the MA 11x7.5. Flew a tank out of it too, I wish my airplane was lighter....

Im using 20% fuel.
Old 05-17-2015, 02:49 PM
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Tbobflow
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I bought another used 61FSR detail out and refurbish as a project. It's in pretty good shape but I need to find a puller for the prop hub so I can replace the front bearing. I've seen a OS one that looks pretty simple to use.
Old 05-17-2015, 05:55 PM
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Tbob. I've been using a cheap battery terminal puller. The type to pull leads off a "post" type automobile battery. I got mine from an auto parts store over 30 years ago. I had to do a little modification to it, but it wasn't anything that had to be precise. Good luck, Greg
Old 05-17-2015, 06:07 PM
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Tbobflow
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Thanks Greg that sounds like an easy thing to try.

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