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Question on comparing the F-35 with the F-15/F-16.

This is a discussion on Question on comparing the F-35 with the F-15/F-16. within the Air Force & Aviation forum, part of the Global Defense & Military category; I'm sure this has been beaten to death already but how loud is the F-35 in full afterburner compared to ...


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Old May 18th, 2010   #1
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Question on comparing the F-35 with the F-15/F-16.

I'm sure this has been beaten to death already but how loud is the F-35 in full afterburner compared to an F-15 and F-16 in full afterburner? And what about F-35 vs F15/F16 in military thrust?
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Old May 18th, 2010   #2
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Old May 18th, 2010   #3
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I would bet that the F-35 is louder than the F-15 and F-16 in full AB.

F-35 has one F135 with 40,000 lbs of thrust
F-15 has two PW-220 with 23,000 lbs of thrust
F-16 has one PW-229 with 29,000 lbs of thrust.
F-22 has two F-119 with 35,000lbs of thrust.

The F-35 has to be louder than the F-15 or F-16 in AB don't know why the 2009 study has the F-35 at 148 dB and the F-16 at 150 dB.
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Old May 18th, 2010   #4
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It does not have to be louder. It's all a matter of exhaust velocity.

The F-35 (with it's limit of mach ~1.6) does not need the high exhaust velocities of the F-15 & F-16 to get to mach 2+. The higher the velocity the higher the noise.
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Old May 18th, 2010   #5
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It does not have to be louder. It's all a matter of exhaust velocity.

The F-35 (with it's limit of mach ~1.6) does not need the high exhaust velocities of the F-15 & F-16 to get to mach 2+. The higher the velocity the higher the noise.
Top speed has nothing to do with noise....

The PW-229 does not have higher exhaust velocity than the F135.

The B-1B only goes mach 1.2 but its louder than any other jet in the USAF.
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Old May 18th, 2010   #6
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This thread is actually repeating itself on two other boards

I am waiting for TEG (The Engine Guy) on the F-16.net to weigh in and give us a hand.

As far as the exhaust velocity of the PW-229 & F135, where are you getting your data from.

As far as the B-1B, it has FOUR engines with very high exhaust velocity, especially in full A/B.
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Old May 18th, 2010   #7
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This thread is actually repeating itself on two other boards

I am waiting for TEG (The Engine Guy) on the F-16.net to weigh in and give us a hand.

As far as the exhaust velocity of the PW-229 & F135, where are you getting your data from.

As far as the B-1B, it has FOUR engines with very high exhaust velocity, especially in full A/B.
Two boards?

Anyway I'm pretty sure the exhaust velocity for the F-35 is no different than an F-15 or F-16.

What I want is for the USAF to just release a study of the F-35s noise levels compared to legacy fighters and stop remaining quiet about it.

BTW is that PDF your posted an official noise study by the USAF?
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Old May 18th, 2010   #8
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Yes, that was an official study done in April 2009 at Edwards AFB.

F-16.net F-35 noise thread here:
http://www.f-16.net/f-16_forum_viewtopic-t-14055.html
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Old May 19th, 2010   #9
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Yes, that was an official study done in April 2009 at Edwards AFB.

F-16.net F-35 noise thread here:
http://www.f-16.net/f-16_forum_viewtopic-t-14055.html
I find the noise study results questionable. An F-16 in full AB can't be louder than a Super Hornet or F-35 sorry even if its just by 2 dB.
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Old May 19th, 2010   #10
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Two boards?
i think he's referring to two other message boards/forums..

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What I want is for the USAF to just release a study of the F-35s noise levels compared to legacy fighters and stop remaining quiet about it.
what conclusion are you looking to draw from such a report?
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Old May 19th, 2010   #11
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i think he's referring to two other message boards/forums..
Ah I see.



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what conclusion are you looking to draw from such a report?
Nothing, it just would be interesting to see how loud the F-35 really is and to shut people up about it.
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Old May 19th, 2010   #12
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I found a patent that shows that by altering the trailing edge of a jet in a chevron pattern (ala F135), it reduces noise and IR signature. This may be another reason why the F135 is not as loud as one might think due to it's total thrust.

Chevron exhaust nozzle for a gas ... - Google Patent Search

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Old May 19th, 2010   #13
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I found a patent that shows that by altering the trailing edge of a jet in a chevron pattern (ala F135), it reduces noise and IR signature. This may be another reason why the F135 is not as lout as one might think due to it's total thrust.

Chevron exhaust nozzle for a gas ... - Google Patent Search
Mate, really good find. Very interesting! Thanks for sharing
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Old May 20th, 2010   #14
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Spud how'd I know you'd Jonny on the spot and not only have the info, but present it graphically!
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Old May 20th, 2010   #15
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I found a patent that shows that by altering the trailing edge of a jet in a chevron pattern (ala F135), it reduces noise and IR signature. This may be another reason why the F135 is not as loud as one might think due to it's total thrust.

Chevron exhaust nozzle for a gas ... - Google Patent Search
I can assure you the F135 does not have lower noise or IR signature over current engines, the F135 is ether just a little louder or a lot louder but at minimum the F-35 is comparable to current fighters in noise.
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