Author Topic: Thumping Noise In 109  (Read 577 times)

Offline Mongoose

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Thumping Noise In 109
« on: September 05, 2019, 08:11:15 PM »
When flying a 109, what is that thumping noise when you turn?

Keep the answers clean, please.

Offline Devil 505

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Re: Thumping Noise In 109
« Reply #1 on: September 05, 2019, 08:21:25 PM »
That noise is the leading edge slats deploying. They work automatically at low speeds or high angles of attack.
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Offline Vraciu

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Re: Thumping Noise In 109
« Reply #2 on: September 05, 2019, 09:08:09 PM »
When flying a 109, what is that thumping noise when you turn?

Keep the answers clean, please.

It's your seatbelt flapping in the breeze.   Tuck it inside next time!   :old:
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Offline FLS

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Re: Thumping Noise In 109
« Reply #3 on: September 06, 2019, 07:11:19 AM »
When flying a 109, what is that thumping noise when you turn?

Keep the answers clean, please.

Slats are high lift devices on the front of wings.  Slats allow a high speed wing to have better slow speed turn performance.

Slats in the 109 deploy automatically by air pressure changes caused by increasing the Angle of Attack. When the wing gets close to max AOA the slats deploy and the wing has a new higher max AOA before stalling.

If you look at the wings you'll see you can run the slats in and out by changing pitch input.

Offline Shuffler

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Re: Thumping Noise In 109
« Reply #4 on: September 06, 2019, 09:06:15 AM »
Your wingman wants in.
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Offline Mongoose

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Re: Thumping Noise In 109
« Reply #5 on: September 06, 2019, 09:42:49 AM »
Devil and FLS, thank you for the explanation. That's actually a pretty cool innovation.

And Shuffler, ha ha.

Offline Drano

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Re: Thumping Noise In 109
« Reply #6 on: September 06, 2019, 10:32:27 AM »
Your wingman wants in.
https://images.app.goo.gl/AcdFAZUz8MCk9AZJA

This guy?

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Offline Drano

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Re: Thumping Noise In 109
« Reply #7 on: September 06, 2019, 10:33:46 AM »
That's better!

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Offline Shuffler

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Re: Thumping Noise In 109
« Reply #8 on: September 06, 2019, 12:13:06 PM »
He..... wants..... in......
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Offline Vraciu

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Re: Thumping Noise In 109
« Reply #9 on: September 06, 2019, 09:31:07 PM »
Devil and FLS, thank you for the explanation. That's actually a pretty cool innovation.

And Shuffler, ha ha.

You’re welcome. 

Ha ha. 

Also, slats are PRIMARILY used to increase the critical angle of attack thereby reducing stall speeds.     Some airplanes call them “maneuvering slats” like the F-4.   Better turn performance is a byproduct of the increased stall margin. 
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Offline Puma44

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Re: Thumping Noise In 109
« Reply #10 on: September 20, 2019, 09:57:26 AM »
Devil and FLS, thank you for the explanation. That's actually a pretty cool innovation.

And Shuffler, ha ha.

The F-4E had leading edge slats that programmed automatically.  They didn’t make any thumping sound, although I could occasionally hear thumping from the back seat when the radar was acting up and the WSO was kicking the bottom of the console to get it back in the game.


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Offline morfiend

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Re: Thumping Noise In 109
« Reply #11 on: September 21, 2019, 12:55:41 PM »
Puma,

  the leading edge slats were programed?  Plz tell me more as I assumed they worked like the 109's did,just some roller bearing and air flow. On the rino were they powered???

  Inquiring minds...... :x



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Offline Meatwad

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Re: Thumping Noise In 109
« Reply #12 on: September 21, 2019, 09:40:36 PM »
Bratwurst rolling around in the fuselage because Klaus was hungry and dropped it when working on the aeroplane
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Offline TequilaChaser

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Re: Thumping Noise In 109
« Reply #13 on: September 23, 2019, 07:05:32 PM »
It's been nearly 34 years since I last worked on an F-4E or G or J or S model phantom  II......

 Best recollection I have Morfiend is they were computer programmed hydraulic leading edge slats on the E and S model....but my memory is not what it used to be....


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Offline Chalenge

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Re: Thumping Noise In 109
« Reply #14 on: September 23, 2019, 07:31:56 PM »
The current variable geometry wings are capable of changing not only the leading edge curvature, but also the trailing edge curvature and overall airfoil shape. The Wright brothers would be amazed at our witchcraft.
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