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  #11  
Old 11-09-2018, 06:01 AM
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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.
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  #12  
Old 11-09-2018, 06:58 AM
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Does it change with changing cabin vent openings? Try yawing plane form side to side to change noise. Guessing canopy seal.

Mark
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  #13  
Old 11-09-2018, 11:41 AM
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bhester bhester is offline
 
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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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  #14  
Old 11-09-2018, 11:47 AM
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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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  #15  
Old 11-09-2018, 12:06 PM
RV Jerry RV Jerry is offline
 
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If you have a tipper canopy very good possibility the forwrward lip of canopy not sealing
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  #16  
Old 11-09-2018, 01:25 PM
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Brantel Brantel is offline
 
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Quote:
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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  #17  
Old 11-13-2018, 08:43 PM
Phaser24 Phaser24 is offline
 
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I had the same type of noise (RV 7A with sliding canopy). Found one area where the weather seal had worn right over the pilot's head where the canopy meets the windscreen; fixed with new weather stripping.
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  #18  
Old 11-13-2018, 10:38 PM
Mark33 Mark33 is online now
 
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Location: Baton Rouge, La.
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Quote:
Originally Posted by rocketbob View Post
Crank seal will sometimes whine as it starts to go bad. Noise will change with RPM. More like a faint squeal.
Iíve heard that exact sound myself.
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  #19  
Old 11-14-2018, 07:57 AM
6 Gun 6 Gun is offline
 
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Smile Whine

I chased a whine for months thought it had to be altenator changed it out twice and still there went to HF and bought a scope like Dr uses and by accident the tip crossed intake gasket at cylinder and found a pin hole making all the noise new gasket no noise.
Bob
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