sound radar is back ... naaaaaaah!

[PolishEagle1939]

Never read in any account thast it was the prop. I've always read it was the oil coolers. I know it makes the sound in level flight because I've heard it at Chino

http://www.youtube.com/watch?v=FQxb-V-rZqA

. Let me know if you can give me a specific book. Thanks

[TomcatViP]

Originally Posted by PolishEagle1939

Never read in any account thast it was the prop. I've always read it was the oil coolers. I know it makes the sound in level flight because I've heard it at Chino

. Let me know if you can give me a specific book. Thanks

I hve read nearly a thousand of aero books. 80% of wich are not with me at present time. Are you torturing me wih that request ?

Looking at your vid, you can hear the whispering once only the plane did pass in front the observer (the cameraman) and not before. This means tht the whine is affected by mach hence the most probable prop related effect (if the LE was mach effected all the wing would be )

I will stand firm on that (no ego related - just logics)

[klem]

Originally Posted by TomcatViP

I hve read nearly a thousand of aero books. 80% of wich are not with me at present time. Are you torturing me wih that request ?

Looking at your vid, you can hear the whispering once only the plane did pass in front the observer (the cameraman) and not before. This means tht the whine is affected by mach hence the most probable prop related effect (if the LE was mach effected all the wing would be )

I will stand firm on that (no ego related - just logics)

http://en.wikipedia.org/wiki/Vought_F4U_Corsair
The Japanese allegedly nicknamed it "Whistling Death", for the noise made by airflow through the wing root-mounted oil cooler air intakes.

The only sound I've heard from prop tips going through the sound barrier is on the Harvard/T6 which gives a kind of rasping effect.

(we must stop meeting like this!)

[Osprey]

Originally Posted by klem

http://en.wikipedia.org/wiki/Vought_F4U_Corsair
The Japanese allegedly nicknamed it "Whistling Death", for the noise made by airflow through the wing root-mounted oil cooler air intakes.

The only sound I've heard from prop tips going through the sound barrier is on the Harvard/T6 which gives a kind of rasping effect.

(we must stop meeting like this!)

Having been at Duxford many times (as I'm sure many others have too) I have to say I don't think that the Corsair really whistles all that much on a high speed pass. The Bearcat on the other hand makes a distinctive whistle, I have a nice video of it somewhere.

[PolishEagle1939]

Originally Posted by TomcatViP

I hve read nearly a thousand of aero books. 80% of wich are not with me at present time. Are you torturing me wih that request ?

Looking at your vid, you can hear the whispering once only the plane did pass in front the observer (the cameraman) and not before. This means tht the whine is affected by mach hence the most probable prop related effect (if the LE was mach effected all the wing would be )

I will stand firm on that (no ego related - just logics)

Or actually the sound comes out the back end of oil cooler and you dont hear it as much from the front. Also said you read it made the noise in a dive. In the video the plane is in level flight and making the noise so maybe the thing you read was referring to another noise. I'm sure we've read alot of the same books (big Corsair fan too) but just have never heard it said it was prop noise, always read the oil cooler made the noise as Wikipedia says.
Cheers