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Joined: 10/26/2002 From: CLINTONVILLE,
WI, USA Status: offline
Mikesell, I remember it very good. The Fox supposibly won, but the Tower .61 was really close, and has ten times the availability. If the Tower .61 runs anything like the .75, it would be a no brainer. I go to alot of flyins during the summer 15-20, and I have yet to see a FOX anything other than a occasional glow plug. It is sad that maybe 25 years ago they were something, because they allmost seam extinct now.
I just skimmed through this long thread and I don`t think anyone mentioned the asp or magnum xls 52. Put a tower muffler on one and it will swing apc 12.25-3-75 at 13700 rpm, I think most normal(not Jett, Nelson, rossi..) 61`s will find that hard to do??? My previous fx 61 couldn`t do it. cheap as dirt to. Mine is working great and is going in a profile during this winter
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Joined: 1/31/2002 From: Ringgold,
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quote:
ORIGINAL: asmund
I just skimmed through this long thread and I don`t think anyone mentioned the asp or magnum xls 52. Put a tower muffler on one and it will swing apc 12.25-3-75 at 13700 rpm, I think most normal(not Jett, Nelson, rossi..) 61`s will find that hard to do??? My previous fx 61 couldn`t do it. cheap as dirt to. Mine is working great and is going in a profile during this winter
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I just bought one of these (ASP .52 two-stroke) from Peakmodel in NZ. Lots of power in a small crankcase.
Ed Cregger
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All the modern .61s date back to the mid 70s when they were expected to live their entire lives at 15000+rpm. These engines were so durable that they could be enlarged internally without sacrificing much reliability. Without the FAI displacement cap .61s have been overshadowed by their .75 and .90 siblings. Most mfgs .40s have very successfully grown into .50s, and .25s into.32s. It will take a new design to produce an ultralight .60.
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quote:
ORIGINAL: Kweasel
All the modern .61s date back to the mid 70s when they were expected to live their entire lives at 15000+rpm. These engines were so durable that they could be enlarged internally without sacrificing much reliability. Without the FAI displacement cap .61s have been overshadowed by their .75 and .90 siblings. Most mfgs .40s have very successfully grown into .50s, and .25s into.32s. It will take a new design to produce an ultralight .60.
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As you said, with the FAI displacement cap removed, there is no reason to develop a .61 anything in any size case.
Ed Cregger
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Joined: 1/21/2002 From: Acworth,
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quote:
ORIGINAL: Kweasel
All the modern .61s date back to the mid 70s when they were expected to live their entire lives at 15000+rpm. These engines were so durable that they could be enlarged internally without sacrificing much reliability. Without the FAI displacement cap .61s have been overshadowed by their .75 and .90 siblings. Most mfgs .40s have very successfully grown into .50s, and .25s into.32s. It will take a new design to produce an ultralight .60.
Most of those old sixties weighed less than a modern sixty. The only one that is sill made is the Webra Speed .60, it is much lighter than today's sixties. The modern sixty has a ninety crankcase.
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Joined: 1/21/2002 From: Acworth,
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quote:
ORIGINAL: asmund
I just skimmed through this long thread and I don`t think anyone mentioned the asp or magnum xls 52. Put a tower muffler on one and it will swing apc 12.25-3-75 at 13700 rpm, I think most normal(not Jett, Nelson, rossi..) 61`s will find that hard to do??? My previous fx 61 couldn`t do it. cheap as dirt to. Mine is working great and is going in a profile during this winter
The FX .61 is rather poor on power. A webra or K&B twister should do better, However I suspect that you may have a bit more thrust on that engine with a 12x4 or 13x4.
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Joined: 5/8/2005 From: BEAVER FALLS,
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A compact 60 with a long stroke? The Fox Eagle 1, mfg from 1972-1980, see the pictures. It weighs 14.9 oz and has a .907" bore x .937" stroke. The first carb had to be tweeked to run well, but then it did. The later 2 needle MKX carb works very well, but MUST be adjusted correctly. www.flitelinesolutions.com has excellent instructions. The very latest FOX EZ carb will fit the Eagle 1. Adapters float around for putting a Perry carb on an Eagle. In 1975, Tower Hobbies sold the Eagle under their name with a Perry; it had the flag and "FOX Eagle" ground off the bypass.
Eagle are seen nearly every week on you know where and can be had for $30-$75 brand new or used very little. They are well made, twin BB, and twin piston rings which gives them lots of compression for hand starting (huh??).
I had my first one in an old DUBROSkymaster ARF, heavy as a stone, but the Eagle flew it around the 1974 pattern fine. Now I'm back into RC, I've got the same engine (with an MKX carb) on a 7# Phoenix Decathlon. I fly it partial throttle. It will pull the Decathlon vertical for couple of hundred yards, far long enough for a vertical pull-up, slow vertical roll and a hammerhead; looks very, very realistic. It will also pull it through vertical figure 8s, not so prototypical! The Eagle 1 likes a larger prop; I use a 12-6 Master Airscrew K-series. Also, I only run 10% nitro with 20% castor oil; the engine will run on a lot more nitro.
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I never used the Perry, just the original carb and the MK X. I put a long piece of silicone tubing on the end of the stock closed front Fox muffler in the pics and it was really quiet, but I didn't like it hanging way down out of the plane. I later made a mousse can after-muffler. I cut the end off a travel can of shaving creme and it fit over the end of the Fox muffler. I clamped it in place, used large silicone tubing and took the outlet off at a right angle. There was just room in the exhaust tunnel in the Decathlon for this. It does a good job of quieting. I did something similar on a Fox 45 muffler for my Spacewalker, but I replaced the whole rear piece of the muffler with the mousse can.
After seeing how just the large silicone tubing quieted the engine and how effective the mousse cans are, I'm convinced that using a "dead" material does a lot to quiet the engine. Long ago, Mark Smith, the Windfree designer, made a muffler from plywood that was very effective. Again, the "dead" material.
How aboout a lead muffler for noseweight?? Yuk, yuk.
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RE: Is there a small 61? - 
