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HomeAircraftHelicopterCentury Radikal G20-30 N640 Hawk Predator › Vibration Solved - I Think
04-30-2010 09:01 PM  8 years agoPost 1
2tall

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Crystal Lake, Illinois, USA

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This started on the Gasser Forum, as I thought that engine tuning was causing a condition sometimes known as hammering. The net result was severe vibration. (This is a new Predator). After much further investigation it has been determined that a faulty pinion gear is the problem, as identified by Century. This issue may have surfaced here many times over, but I thought I'd publish the problem and fix again just in case anyone else with a recent Predator is having the same problem. Here's some content from the other forum:

Spoke with Paul at Century a few minutes ago. Half way through my description of the problem he identified the pinion gear as the issue and is sending a replacement.

It seems that Century received some kits with bad pinions pre-assembled to the clutch bell. Paul was not sure if the bad pinions were made out-of-round (tough to do on a lathe) or if the distortion occurred as they were threaded in to the clutch bell.

After the conversation I re-examined my clutch bell/pinion assembly, and Paul is right. Hold the clutch bell true and the pinion wobbles, hold the pinion true and the clutch bell wobbles.

Century was quick to respond, as usual.

"Pay attention...lest the ground rise up and smite thee."

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