Sound - High pitch whine

Aye.

 

 

I can link to a testimony from another who says the complete oposite.

Please do here's mine.

http://www.mustangsmustangs.us/thehangar/index.php?topic=958.0

I taped up the barrels and just went for a quick flight and guess what? ..............No whistle!!

 

Not all Mustangs have the same whistle as some do it at high speed or in a dive, but this one whistles at high angle of attack which is why I suspected the inner gun barrels. The most noticable was at around 4g pulls and on landing if you put all three on the ground at the same time. Just did both, and it was quiet. Before you could definitely hear it from the cockpit and that means it must really be loud from outside!

Guys I think the barrels are the source. Yesterday I completely taped them and sure enough no whistle. So there we have it. I still can't figure out why Frenesi doesn't whistle in spite of the same gun setup? Jim

Nate

I know Ferocious Frankies' cheif engineer and he's confirmed that it is gun port whistle at +G's. It's not the supercharger and not the ram air..... It's the Gunports.

 

http://www.youtube.com/watch?v=wd8Q3dxQ5KY

That video is pretty solid proof that the whistle is strongly AoA-dependant. At least above a certain speed. BTW, great pilot.

But also in the previous video of Miss America there's a whistle (a weaker one, that's true) in horizontal flight, and MTFDark Eagle posted a picture that suggest it doesn't have any gunports.

Now I really don't get it.

Please do here's mine.

Here you go ;)

http://a2asimulations.com/forum/viewtopic.php?f=23&t=14842

Most importantly, the sound you are hearing is augmented by the air passing through the radiators beneath the airplane coupled with the above. There are 2 doors under the scoop. One controls the oil temperature and the other the coolant temperature.Usually, during a demonstration where you might be viewing a low flying Mustang , the oil and coolant shutters are selected automatic, but if the temps are high due to extended power settings at Meto or above, the pilot might have both shutter doors open manually. The actual position of these two shutter doors at any given time will change the sound you are hearing and most certainly are responsible in large part for the famous Mustang "whistle".

 

....

 

Our 51 had custom plugs in the gun ports. Whistled just fine )

Here you go ;)

 

http://a2asimulations.com/forum/viewtopic.php?f=23&t=14842

I've seen that before (I think we must've had this dance before :) ) - so your 1 source v my 2 and that isn't including Nick Grey at TFC.

Anyway I am of the opinion that there are 2 sounds the Whistle and the Screaming sound. One of the posts in your thread tried to make that distinction too.

Can you find me a really loud level flight screamer that has no guns? That would go a long way in finding the mian source for that scream.

Nate

You all know what it is... It's the pilot inside screamin like a girl cuz what he's flying is sooo DAMN COOL! :thumbup:

The clearest example of there being two different whistles is here:

There is the very loud howl which appears to be related to angle of attack (the one people suspect is the gun ports whistling,) the second is the relatively quiet and higher pitched whine.

The clearest example of there being two different whistles is here:

 

 

There is the very loud howl which appears to be related to angle of attack (the one people suspect is the gun ports whistling,) the second is the relatively quiet and higher pitched whine.

Yep spot on - the two sounds are quite distinctly heard there.

BTW - how do you link directly to a time in the vid like that?

Nate

I suspect the high RPM of the propellor, modulated by the doppler effect.

Please compare it to the sound of Hind's rotor blades. .

Have on mind that Pony's propellor has a lot more RPM than Hind's rotor blades, so it is logical, that Pony has a higher whistle...

Thats all IMHO :music_whistling::smartass:

Whatever the correct answer is, I find it very entertaining everytime the subject comes up.:D

I suspect the high RPM of the propellor, modulated by the doppler effect.

 

Have on mind that Pony's propellor has a lot more RPM than Hind's rotor blades, so it is logical, that Pony has a higher whistle...

 

Thats all IMHO :music_whistling::smartass:

Hmm I find this logic hard to understand - surely all prop aircraft would exhibit this behaviour then.

Nate

Yeah, we should go to some nice pub, order a lot of beer and discuss it whole night :beer::drunk::thumbsup:

Hmm I find this logic hard to understand - surely all prop aircraft would exhibit this behaviour then.

 

Nate

Every propellor is different, different shapes, angles, rpm...

The pony sound reminds me Stuka siren also...

So the concluson is that everyone is right and that the scream is from the gunports and the thingies......

Vodka and coke please Suchacz.

I suspect the high RPM of the propellor

It's the oil cooler fan.

It's the oil cooler fan.

This might be the holy grail!

It's the canopy, its the planes paint, its the radio antenna, its the left wing, maybe the right wing. What about the seat cushion...:music_whistling:

Yep spot on - the two sounds are quite distinctly heard there.

 

BTW - how do you link directly to a time in the vid like that?

 

Nate

Right click on the video and select Copy video URL at current time.

Found two other nice videos of whistling P-51's:

On the comments for the first video someone claim it's the ammo ejector ports whistling, which seems plausible. Do they fill those in on the planes without guns, or are they left open?

Nice videos.

Oh, and in case anyone complains about the noise... it could always be worse. :D

Right click on the video and select Copy video URL at current time.

 

Found two other nice videos of whistling P-51's:

 

On the comments for the first video someone claim it's the ammo ejector ports whistling, which seems plausible. Do they fill those in on the planes without guns, or are they left open?

Oh lovely, they're both Ferocious Frankie videos.....LIKE!:megalol: Oh and Miss Velma too

Right click on the video and select Copy video URL at current time.

 

Found two other nice videos of whistling P-51's:

 

 

 

On the comments for the first video someone claim it's the ammo ejector ports whistling, which seems plausible. Do they fill those in on the planes without guns, or are they left open?

Now that is how a mustang should sound! :thumbup:

I haven't read the whole thread but it sounds like a supercharger to me.

I haven't read the whole thread but it sounds like a supercharger to me.

Maybe you should read the whole thread then. :)

If it was the supercharger (which it isn't), you'd hear it more than just when there is high AOA on the airframe.

Thinking about my years as a commissioned mechanic in GM dealerships, I was usually troubleshooter in Wiring harness shorts and "noises" in newly delivered automobiles.

All you need for air "whistles" is a gap between two surfaces big enough for air to get into and cause turbulence within that gap. It can even be a gap that is part of the body design. So it could be anything .

Maybe it's R2!

Everytime I hear the spitfire whistle, I think LucasFilms used it for this:

:D

Sorry, for the OT.

It seems to be one of those mysteries that may never be solved...