Engine shudder at end of climb

·         Harry Smithard

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Hi

Today when I throttled back to cruise setting at end of climb to 8,500ft. The aircraft gave a brief shudder. It appeared to come from the front of the aircraft and was very brief (1 or 2 seconds) and then stopped. All readings were normal and continued to remain so for the remainder of the flight. I checked compressions when on the ground and all were good and no unusual sounds were evident.

Any ideas?

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·         Doug Smith

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Hi Harry,
Do you have EGT data? The altitude compensation of the carby is an approximation and, depending on a lot of factors, it can sometimes get things a little wrong at altitude - but provided the EGT numbers are within limits it's not usually anything to worry about.

The mixture from the carb also goes a little funny for a second or two after a sudden power adjustment - after all it's controlled by both the pilot (throttle) and engine (air mass flow rate etc) so it can take a moment to sort things out when one or the other of those inputs is suddenly changed.

Regards,
Doug.

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·         Harry Smithard

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Thanks Doug

I don't have EGT data but I thought it my have been a richness issue which your reply have pretty much confirmed. Thanks again