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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Engine Quits in Midair
08-11-2007 04:42 PM  10 years agoPost 1

rrElite Veteran

E. Amherst, NY

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My OS50SXH quits in mid air, and I am lucky to auto the heli safely in one piece. When I fire it up again, the engine starts up with no problem, but as soon as I remove the glow plug ignitor, the engine quits. Is the glow plug gone bad?


08-11-2007 05:43 PM  10 years agoPost 2



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Either too rich or bad plug or too lean in midrange

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08-11-2007 08:48 PM  10 years agoPost 3


Medicine Hat, AB Canada

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Check your rear bearing. I had a similar situation this week with flameouts and found the rear brg was toast, after checking out the usual items (fuel lines, air leak, carb debris, etc)

Good Luck!

Rave 90 ENV / Radikal E640 / Rush 750 / Trex 600N
Team No WhinerS, Team Renegade R/C Heliflyers

08-11-2007 09:32 PM  10 years agoPost 4


Cedar Rapids, IA

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Yes, assuming it was running OK for awhile and this behavior just started, there's a good chance your rear bearing is starting to fail. Small bits of metal flake off the inner and outer races and find their way to the glow plug.

A plug fouled with bits of metal will start and run, but generally the motor will quit when you remove the battery, or it may run until you get to about 1/4 - 1/3 throttle, at which point it just quits.

Changing the plug can seem to make things better for awhile till another bit of metal finds its way to the plug.

Remove the motor, disassemble it, and inspect your rear bearing closely. Also inspect the piston skirt for scratches, the crown of the piston for dents or pits, and the inside of the cylinder head for dents or pits.

I recently replaced the bearings as well as the piston and ring in one of my OS 50s after it flamed out in mid air. The bearing was indeed bad, and under a microscope, I saw bits of stainless steel embedded in the piston skirt (it was a stainless steel/ceramic ball bearing).

I caught the problem in time and that OS 50 SX-H runs as good as it did when it was new and just getting broken in.


It's a good idea to wash out the innards of your muffler if the bearing has gone bad, as bits of metal that make it through the motor can get stuck there, to be sucked back into the motor at a later date, putting out the fire...


* Making the World Better -- One Helicopter at a time! *

Team Heliproz

08-12-2007 07:25 AM  10 years agoPost 5


Swalmen, the Netherlands

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Check the plug as well.
See if it is distorted or a matt color

If it is then check your temperture after 30 secs of hovering.
You might be running too hot.

Walter Robijns, 3D rules !!!

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