What is this? - Auxiliary Power Unit (APU)
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I found two pictures of AA-1 F-35. But, I found one curious thing. Is that a new heat emission part? If so, doesn't it affect stealth?
Curious George, Newbie.
Curious George, Newbie.
Last edited by flyingdonkey on 14 Apr 2009, 11:37, edited 1 time in total.
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flyingdonkey wrote:I found two pictures of AA-1 F-35. But, I found one curioous thing. Is that a new heat emission part? If so, doesn't it affect stealt?
Curious Goerge, Newbie.
That's the APU. The auxiliary power unit. A small turbine used for providing power when the F-135 engine is not running. It is only used on the ground. It doesn't output anything while in flight or even when the aircraft is taxiing with the main engine running.
On the production airframes (AF-1 and later) this is moved to the underside.
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Ah, I guessed it was APU. Sorry, I know APU. my background is avionics and design. Oh but not for mil planes.dwightlooi wrote:flyingdonkey wrote:I found two pictures of AA-1 F-35. But, I found one curioous thing. Is that a new heat emission part? If so, doesn't it affect stealt?
Curious Goerge, Newbie.
That's the APU. The auxiliary power unit. A small turbine used for providing power when the F-135 engine is not running. It is only used on the ground. It doesn't output anything while in flight or even when the aircraft is taxiing with the main engine running.
dwightlooi wrote:On the production airframes (AF-1 and later) this is moved to the underside.
I see. That's why I got confused. AA-1 and earlier test frames showed no such APU. That will be moved to undersided?
If so, what Lockheed announced is true? Some articles said that the overheating issue is critical in terms of IR singnal. Is that the reason they changed the frame slightly?
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