Whistle noise in cabin

[BC0979]

Hello from sunny Florida!

I finally got my S up in the air without the overheating issue. 

She is a wonderful flying aircraft! 

 

I have a whistling sound that I cannot locate so I thought I would ask the forum if you encountered a similar issue and where it was located, and how you were able to remedy it.

 

Many thanks again and again 

 

Bryan 

 

 

[turboplanner]

Get about a metre of 1/2" plastic tube; put one end up to your ear and poke the other end around the likely sources.

This will localise the sound pick-up from surrounding noise, and you should be able to identify the exact area.

 

[IBob]

Assuming that you sealed where the bottom of the windscreen meets the fuselage......the next most likely place is where the wing root fairings meet the windscreen at the sides and top.

[rodgerc]

Sorry….I know this isn’t helpful, but it provides an insight into contemporary Australia’s national IQ

[facthunter]

 Nearly anything can cause a whistling noise.  Just a raised edge of a door. Put a piece of plasticene at a likely spot and work through various locations. It doesn't need much to change it.  Catalina's always whistled. You could hear it from the ground. That's how you knew it wasn't a DC 3. (Same motors). I think a Piper Tripacer also from the suction venturi.  Nev

[BC0979]

Thank you all for the replies 

I will continue looking....

 

[440032]

Some years ago a friend mentioned an annoying high freq vibration in his C182, coming from down the back somewhere. He checked all his antennas, and everything.

I jumped in the back and off we went. Level off, pass 90 kt, bzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz yep. He said "hear that? It's coming from down the back."

Well it was in front of me in the back seat. Looking around what do I spy between me and him - an air vent up on the left roof. Closed the vent, noise gone. Opened the vent just so, noise back. Vanes in the vent were singing like a reed in a musical instrument.

That'll be $500 mate - cash or card?

[IBob]

The wing root fairings on my Savannah are aluminium, with a rubber edging where they meet the screen. At something over 95kts, I get a noise like someone blowing a high pressure raspberry.
However, since you have to point at the ground to reach those sort of velocities, it doesn't happen during 'normal' flight.
Though I do get the occasional quick blast at cruise in turbulence.

[facthunter]

A built in "overspeed" indicator. Now everybody will  want one.  Nev

[IBob]

Bryan, now I think back: the pilot who test flew my Savannah taped over a small hole where the root fairings meets the wing skin LE. The fairings are non-standard, I wanted them to turn in more towards the screen and give me a wider field of vision. So that edge of the fairing (which tucks in behind the wing skin) has a series of cuts in it, resulting in small holes when they were fitted, one on each side out in the airflow enough to make noise.
That tape is still there: two round silver dots of it.

[BC0979]

Thanks again for the suggestions,  these do help.

It's the little areas that are easily overlooked