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Old 11-09-2018, 06:01 AM
rocketbob's Avatar
rocketbob rocketbob is offline
Join Date: Jun 2006
Location: 8I3
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Crank seal will sometimes whine as it starts to go bad. Noise will change with RPM. More like a faint squeal.
Bob Japundza CFI A&PIA
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Old 11-09-2018, 06:58 AM
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strahler13 strahler13 is offline
Join Date: Jan 2005
Posts: 362

Does it change with changing cabin vent openings? Try yawing plane form side to side to change noise. Guessing canopy seal.

Mark Strahler
RV-6 (Purchased flying)
KFFC-Peachtree City, GA
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Old 11-09-2018, 11:41 AM
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bhester bhester is offline
Join Date: Jan 2005
Location: Hopkinsville, KY
Posts: 827
Default noise

When I picked up my plane after getting it painted, I had a whine noise that I did not have before getting it painted, it was pretty loud.
I accidently found it when I started feeling around for air leaks. I put my fingers in the area right between the canopy rail and the canopy skirt right beside me and the noise went away. The bottom pilot side canopy skirt was bent outward near the front just enough to cause the air to whistle or whine while in flight. I messaged the skin inward in that area and it has never whined again. It was caused by the canopy sitting on the table while it was off during the painting process. So check that area on both sides.
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Old 11-09-2018, 11:47 AM
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Phil Phil is offline
Join Date: Nov 2006
Location: Waco, Texas
Posts: 1,634

My backup battery for my G3X will make a faint whine when it is switched on. Itís not enough to be annoying, but itís enough to notice when the engine goes quiet. I kinda like it because it reminds me to shut it off after shutting down.

Another thought is to check the exhaust stack and see if itís sagging enough to hit the lower cowling.

Just a couple of more potential spot to look.
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Old 11-09-2018, 12:06 PM
RV Jerry RV Jerry is offline
Join Date: Jan 2009
Location: Chino, CA
Posts: 171

If you have a tipper canopy very good possibility the forwrward lip of canopy not sealing
Jerry Scott
Rocket II
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Old 11-09-2018, 01:25 PM
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Brantel Brantel is offline
Join Date: Mar 2006
Location: Newport, TN
Posts: 7,005

Originally Posted by RV Jerry View Post
If you have a tipper canopy very good possibility the forwrward lip of canopy not sealing
Prime suspect. I have found that my seal is kinda miffed up causing it to push up on the lip of the skin a little.
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