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| Hearing engine beat frequency http://t18.net/thorpforum/viewtopic.php?f=8&t=9062 |
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| Author: | peterjaypriest [ Mon Aug 19, 2024 10:26 am ] |
| Post subject: | Hearing engine beat frequency |
Not sure how to categorize this one- it's strange. It is not T18 specific, but thought I'd start here... I'm flying my T18 IO360 with Hartzell CS prop quite a bit- mostly longer trips. I've begun to notice what sounds like an engine beat frequency- like a twin with the engines slightly out of sync. It's roughly 1 beat per second. It may have been doing this for some time- but I've just recently noticed it, and can't imagine what this could be. Two things rotating at slightly different speeds, I guess. Maybe prop governor? Anyone ever experience this? Any ideas? Thanks! Peter |
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| Author: | fytrplt [ Mon Aug 19, 2024 5:07 pm ] |
| Post subject: | Re: Hearing engine beat frequency |
Check the fuselage gap cover where the wing attaches. These have known to vibrate loose over time and can resonate. |
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| Author: | peterjaypriest [ Mon Aug 19, 2024 7:21 pm ] |
| Post subject: | Re: Hearing engine beat frequency |
Interesting! I never would have thought of that. I'll check, fly, and report back. Thanks Bob! |
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| Author: | peterjaypriest [ Sun Sep 15, 2024 12:56 pm ] |
| Post subject: | Re: Hearing engine beat frequency - Resolved! |
Just to close this out... So, I found the panel under the walking beam had a number of surprisingly loose screws at the outer ends. I tightened those, and took another long trip. The resonance is gone! Big thanks to Bob Highley for suggesting it might have been something loose causing the issue. I've learned something! Thanks again, Bob! I owe you a beer! Peter |
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