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Question: Lakenheath, noise as jets depart?

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Mattaddiction
Posts: 60
Joined: Mon May 02, 2016 10:34 pm

Question: Lakenheath, noise as jets depart?

Post by Mattaddiction » Tue Jan 23, 2018 2:27 pm

Hi,

Long time lurker, hopefully A/Not the worst place to ask, and B/ Not a totally stupid question!?! :

Watching F15's at Lakenheath, I have been wondering for ages what the noise you can hear, a whistle or something (for want of a better description), just before the planes start to go down the runway?

Cheers,

Matt

POL
Posts: 16717
Joined: Sun Oct 04, 2009 3:26 pm

Re: Question: Lakenheath, noise as jets depart?

Post by POL » Tue Jan 23, 2018 3:07 pm

This noise? https://youtu.be/4GHEOlAX02c?t=18s

One forum says:
The F-15's F-100 engines make a quite distinctive "whoop" noise caused by bleed air escaping from pressure relief valves in the pneumatic nozzle operating system, when the exhaust nozzle petals are opened up or closed down.
But not sure how accurate it is!

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The Phantom
Posts: 3681
Joined: Sun Oct 04, 2009 7:16 pm

Re: Question: Lakenheath, noise as jets depart?

Post by The Phantom » Tue Jan 23, 2018 8:25 pm

EGVP wrote:This noise? https://youtu.be/4GHEOlAX02c?t=18s

One forum says:
The F-15's F-100 engines make a quite distinctive "whoop" noise caused by bleed air escaping from pressure relief valves in the pneumatic nozzle operating system, when the exhaust nozzle petals are opened up or closed down.
But not sure how accurate it is!
Very accurate. That's exactly what it is. The same with the F-16 as well.

Mattaddiction
Posts: 60
Joined: Mon May 02, 2016 10:34 pm

Re: Question: Lakenheath, noise as jets depart?

Post by Mattaddiction » Wed Jan 24, 2018 2:38 pm

Ah that's it at 1:15 on that clip. Guessing that's what is described as a 'Whoop'.

Thanks! Been one of those minor mysteries I've been wondering about ever since the first time at Lakenheath.

matt

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