Funny engine story with a purpose... - RCCanada - Canada Radio Controlled Hobby Forum
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Old 07-17-2008, 11:35 AM   #1
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Funny engine story with a purpose...

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OK, here is one that had me stumped for a few nminutes...

Last night I was out flying with my friend Dan. He has a scratch built pattern type plane with a new O.S. FS-81a in it (a very sweet running engine). On his first fight, the engine was running really well untill about 5 minutes in, it slowed down and quit. The engine didnt sound like it had died from fuel starvation, nor did it sound like it was sagging/quit from overheating (my first thought was OH NO since I had set the needles and should know what I am doing).

Dead sticked in, and we tried to get it going. Lots of fuel, and fuel was getting to the engine. Good plug (but we swapped for a new one anyhow), and good compression. It would just not run at ANY throttle setting on the transmitter. If I primes it, and turned it over it would bump. but it would just not "go". I tried opening up the low and high speed with no improvement.

Finally, after about 10 minutes I decided to bend down and have a look at the throttle arm (it is in a semi cowled side mounted installation and the throttle can not be clearly seen). Sure enough, the throttle ball link had popped off and the arm went to the fully closed position. Doh! That explained everything and once the ball link was replaced everything was fine.

Sometimes, the easiest answer is not so easy - when you are not expecting it to happen.

Live and learn!

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if its got a wing or two and an engine - I like it!
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Old 07-17-2008, 11:44 AM   #2
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Re: Funny engine story with a purpose...

I remember chasing one for a whole day. New guy has a trainer that did something similar engine gradually lost power. Nothing appeared wrong and the throttle action showed fully open and closed. When restarted it ran fine until about half way through the flight then it slowly lost power again. After all day of fiddling with it he mentions this started since he replaced the throttle arm screw when he lost the original. Upon inspection he used a standard thread instead of metric and had just enough bite that the throttle lever would operate the barrel but loose enough to allow the barrel to vibrate slowly closed. Of course returning the throttle setting to low or off reset the barrel until it slowly rotated closed again. Had us stumped for a while.

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Old 07-18-2008, 07:37 PM   #3
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Re: Funny engine story with a purpose...

One of the worst ones I had was a piece of dandilion fluff that got into the needle valve.

Everything would run at idle, but under full power the fluff would compress and starve the fuel flow and of course the fluff was invisible when wet.

Found it when I took the carb apart for cleaning.
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Old 07-18-2008, 09:22 PM   #4
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Re: Funny engine story with a purpose...

Funniest one I had was on my Saito 72, the o-ring is friction fit in the head and vibrated out along the carb riser causing an air leak. Fully cowled, I could neither observe nor expect it.
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