:) Any estimate? Well... WASP was apparently a turbofan, and thus likely quieter than these small turbines - less high-frequency noise from shear. Quick goog

:) Any estimate? Well... WASP was apparently a turbofan, and thus likely quieter than these small turbines - less high-frequency noise from shear. Quick googling turns up [1], which has a CJR900 small airliner as 78 SEL dBA @ 400 ft @ low 1k lb taxi thrust. So perhaps take that as a low bound. And [2] suggests an upper bound of 120 db at 9 ft for one of those small turbines. So...? I was going to say "No idea, sorry", but when encouraging estimation and rough quantitative reasoning, I argue that one should never say "no idea", because its almost always untrue - one can almost always get some bounds. And surprisingly often, they are satisficingly narrow. Though perhaps not these. One notable thought from [2] was the high-frequency noise attenuates rapidly with distance. [1] https://www.nap.edu/read/22606/chapter/6#19 https://www.nap.edu/read/22606/chapter/6#19 [2] https://www.rcuniverse.com/forum/rc-jets-120/9317226-need-decibel-level-jetcat-p-70-a.html https://www.rcuniverse.com/forum/rc-jets-120/9317226-need-de...