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Cox Engine of The Month
September-2021
crankbndr's

"Cherry Bomb" .051 engine

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What a friend gave me. - Page 3 Empty

What a friend gave me.

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Post  getback Thu Jun 10, 2021 7:29 am

I don't see why you didn't get more Rs out of the engine or maybe i am thinking 4" props ? Was looking for the weight and looks like ur in the neighborhood one guys say 11 oz. but all are saying lacks on performance other than round and round . https://stunthanger.com/smf/12-a-building/weight-of-hyper-viper-and-cox-chipmunk/ Hopefully it will carry itself for you to get some laps .
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Post  batjac Thu Jun 10, 2021 9:18 pm

Eric, I’d say it’s a combination of 6” prop, non-optimized head, and fit and finish. I’m going to play around with it more.  I don’t have a lot of time at the moment.  We’re re-doing the floors and carpet, so that’s taking most of my free time for a few weeks.

I took the plane to the field today to try it out.  Not an impressive start.  I ran five bladders of fuel yesterday through the engine, and the needle stayed where I set it each time (when it ran).  The needle has the standard spring with the black plastic spray bar seal.  I’ve always had a pretty good track record with these seals, so I just went with it as is, since it did so well on the test runs.  I thought about using the washer/fuel tube method to hold the needle, but since it was no problem, I passed.  Big mistake! At the field, the needle started drifting.  It would rotate back and forth about a quarter of a turn.  Not a big deal on a normal product engine, but when your tuning range from slobbering rich to over-lean is only a little over a half turn, this is devastating.  The engine just kept surging and sagging, and the plane just limped around the circle.  Ah, well.  I’ll take the plane back apart and install the tubing and washer.

I did start the camera and video the flight, but it doesn’t do any good if you forget to take off the lens cap…


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