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PW F-119 and GE F-120

flateric

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Looking for color photos of PW F-119 and GE F-120 equipped with YF-23 nozzlez, AFAIK some photos were in AWST ca 1990-91. Thanks anyway:)
 

overscan (PaulMM)

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Nothing. I found nice pics of the YF119-PW-100L which is the Lockheed variant here:

http://www.enginehistory.org/usaf.htm

plus generic "2D vectoring" nozzle version.
 

flateric

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Thanks, Paul, and there's not just YF-22 variant, YF-23 as well - that's PAV-1 in restoration facility in WPAFB Air Force Museum:
http://www.enginehistory.org/G&jJBrossett/USAF/P&W%20YF119%20Northrop-McDonnell%20Douglas%20YF-23.JPG

I've found some more pics on the web, (c) Phil Callihan
 

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  • 04USAFM-YF23Engine-2.jpg
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overscan (PaulMM)

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Hey, you are right, I was correct and didn't even notice! I thought it was the right thing, due to the YF-23 in the picture, but from the angle of the pictures the nozzle didn't look correct. I found the other pics you posted too, but didn't notice the one with the great view of the YF-23 nozzle.

My only defence is that it was very late and I was tired ;)
 

overscan (PaulMM)

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Some more nozzle stuff
 

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  • YF119-Lockheed.jpg
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  • YF119-Northrop.jpg
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  • YF120.jpg
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overscan (PaulMM)

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One more.

Source:
  • David C. Aronstein, Michael J. Hirschberg, & Albert C. Piccirillo Advanced Tactical Fighter to F-22 Raptor: Origins of the 21st Century Air Dominance Fighter AIAA 1998
 

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flateric

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Paul - thank you so much! Look what I digged -
 

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overscan (PaulMM)

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Higher res scan of YF120 nozzles in TIF format as requested by flateric
 

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elmayerle

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Biggest difference is that Northrop found they could get all the manueverability they could use without going to vectoring nozzles, which greatly simiplified the back end of the YF-23.
 

flateric

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AFAIK, Lamilloy tiles with active cooling added pretty weight penalty to nozzle trenches design, but at EMD a/c Lamilloy was substituted with composite heat-resistant covers. Needles to say that I still can't understand why cheaper and smarter design didn't win.
 

flateric

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Does anyone know any dimensional data of PW F119 engine? In fact, figures of nozzle throat dimensions are of interest.
All I could dig is that inlet diameter approx. 46-47'. Or it's still classified/proprietary data? Would be funny because at least YF119 could be easily accessed at USAFM.
 

crash dummie

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  • P&W%20YF119-PW-100L%20side.jpg
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  • P&W%20YF119-PW-100L%20variable%20nozzle.jpg
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ScrutorAudax

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Through what mechanism did the engines accomplish thrust reversal? I thought that it was a design requirement that wasn't dropped until after the prototypes had been made.
 

Sundog

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ScrutorAudax said:
Through what mechanism did the engines accomplish thrust reversal? I thought that it was a design requirement that wasn't dropped until after the prototypes had been made.


These engines did not have thrust reversing. The requirement was dropped in enough time that the YF-22 was designed without the requirement on the airframe. However, the YF-23 prototypes were already too far along to change their airframes, so the nacelles were still sized to have TR, but the engines never had that capability.
 

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