jetblast16 wrote:Yes, the Raptor is awesome particularly in its sustained climb and acceleration (airshow perspective). I'll tell you what is a noisy engine, at least to me, is the Pratt & Whitney -229 engine. That thing makes a racket!
Engine noise is related to the amount of airflow and exhaust velocity, which is driven by engine pressure ratio and exhaust temperature (way higher in AB):
F100-220. 228 pps / 3.0 EPR
F110-100. 265 pps / 3.0 EPR
F100-229. 250 pps / 3.4 EPR, upmatched to 3.6 at Max AB
F110-129. 270 pps / 3.2 EPR
F119. More. /. Higher than -229
F135. More than F119 / similar to F119
Interesting that in fleet usage the F-22 is typically quieter than F-15/F-16 because 95% of takeoffs are made at Mil power - no need for AB. But the really loud one on takeoff is the B-1, with four F101 engines (350 pps airflow) in max AB, setting off every car alarm down the flight line as it passes down the runway and continuing for many minutes during climb out down range.