Quiet Flight

Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by needswings, Dec 9, 2009.

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  1. Feb 29, 2012 #141

    delta

    delta

    delta

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    It's kind of humbling to see the scope of Kelly's work.

    Rick
     
  2. Feb 29, 2012 #142

    GESchwarz

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    Max, No, I think that's about it. Those two devices, the centrifuge and the piccolotube individually are effective in their own right, and combined the effect is absolutesilence. You look at the way a typicalmuffler is designed and all they aredoing is some random baffling in an attempt to break down the exhaust pulses byshear turbulence, which in itself generates its own noise, and some canceling.
    The centrifuge sends the pulses to the circumference ofthe can and venting from the center of the vortex where the pulses are weak. The piccolo with the reverse flow jacket takes each pulse and cuts it up into little pieces and spreads it over time; so instead of hearing one big “pop”, you hear lots of very small pops.
     
  3. Mar 1, 2012 #143

    fadec

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    I was considering this project a while back but decided to leave it for someone with deeper pockets, not to mention the shear hassle of trying to get a warbird out of the US these days.

    Stan Hall of sailplane fame was the airframe design manager for the YO-3A. Not sure how much input Kelly Johnson had as it was developed away from the main skunk works.

    On a practical level the pilot flies from the rear seat so the view fwd isn't as good as it could be.
     
  4. Nov 23, 2017 #144

    pictsidhe

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    That'd be now, how's it going?
     
  5. Nov 23, 2017 #145

    TFF

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    Stardate 11232017; we have gone back in time to the year 2012. Our concern is accidentally altering the timeline of people using the search function...
     
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  6. Nov 23, 2017 #146

    pictsidhe

    pictsidhe

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    Marty, you have to go back to September 1945 and give Fred Trump a condom!
     
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  7. Nov 23, 2017 #147

    Hot Wings

    Hot Wings

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    Filled with other projects. The beavers keep fixing the dam...........Makes it hard to drain the pond.
     
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  8. Nov 23, 2017 #148

    BJC

    BJC

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    Back in the 1980’s prince Charles was in the news for learning aerobatics in a Chipmunk. He was invited to come across the pond and participate in an aerobatic contest, but he was a no-show. I won’t say any more about his family, since I’m not British.


    BJC
     
  9. Nov 24, 2017 #149

    Victor Bravo

    Victor Bravo

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    Might as well have him take that time machine back 50 or 60 years and fix a few problems on the other side of the aisle as well. At least with the current (imperfect) situation, the pendulum is swinging back toward the middle where things are in balance, instead of further off the rails in the direction it had been going. Maybe his time machine can go into the future a few years and stop the pendulum from swinging too far in either direction, eh?

    Uh Oh... what's that red dot doing on my chest?
     
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  10. Nov 24, 2017 #150

    pictsidhe

    pictsidhe

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    That's a sign of the times, VB!
     

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