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Old 5th Nov 2014, 14:25
  #5353 (permalink)  
Finningley Boy
Join Date: Dec 2009
Location: Welwyn Garden City
Age: 59
Posts: 1,229
F-35 Noise “Good to Go” 31 Oct 2014 John A. Tirpak

"Studies of F-35 noise relative to legacy fighters will be released Friday, and will show that “on the ground, at full military power,” which is full power without afterburner, the F-35 is “actually quieter, by a little bit” than legacy aircraft such as the F-15, F/A-18, and F-16, F-35 Program Executive Officer Lt. Gen. Christopher Bogdan said Thursday. That means the F-35 is “good to go” for beddowns in the US, he said. This “real noise data” should dispel rumors that the F-35 will be much louder than its predecessors. Part of the reason is that the F-35 is “very sleek in its outer mold line, without a lot of drag,” Bogdan said. Using afterburner, however, the F-35 is considerably noisier than its predecessors, as it generates 43,000 pounds of thrust. Its noise will be on a par with the old F-4 Phantom, Bogdan reported. Although its character is different, the F-4 noise is deeper than that of the F-35, he said. The differences, however, may be hard to detect with the human ear, which cannot perceive differences of up to three decibels, he reported. The numbers were developed in 2013 and “validate” numbers developed in 2008 with an early, pre-production version of the F-35."
Surely all the above mean quit mean comparisons. I'd have thought there might be significant difference in recorded data between the decibal output of an F-16 and an F-15 in dry power? Also, when comparing the F-35 to an F-4 in reheat, would it make much difference between the Spey engined and J79 engined variety? As I recall the former produced a rather more deep low frequency register while the latter had a more screachy roar like the Lightning, Sea Vixen, Hunter etc. I can't quite recall, but I understand the Javelin's Sapphires had quite a noticeable noise output.
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