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Old 02-11-2006, 11:57 AM   #1
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Glow Plugs

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Just wondering, how often should you replace glow plugs? I just had a plug burn out at the worst possible time just after take off, about 20ft of altitude. There wasn't the option of turning back to the field, so I kept it straight and landed as nice as I could into a plowed field. luckily only the landing gear was bent and there was a couple of scuffs on the monocote.

The glow plug that was in it was maybe two seasons old with about 60 flights on the aircraft. So I am curious if you guys have your own recommended change intervals and if you find this helps or this is just the way it is.

ps engine ran smooth in all ranges of operation with no tell tale warning signs.
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Old 02-11-2006, 01:00 PM   #2
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I have only had them fail when the driver was hooked up, but I usually change them every spring.

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Old 02-11-2006, 02:36 PM   #3
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Glow plugs

You should change them when you notice a 5-600 RPM drop or an audible drop in sound when you disconnect the power to the glow plug. If you experience this, don't lean the engine out to compensate for the drop in RPM. You may get the engine to run smoother but you are leaning it out beyond an acceptable amount from the original setting and can damage the engine.
There is no such thing as a landing, it's a controlled crash.
Jim West MAAC 22948
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