3 ms·
Appreciate the reference, I wasn't familiar with the ICAO noise standards. If I'm reading things correctly it looks like Stage 5 caps out at 50dB, whereas a cu
by ctippett 2y ago
Appreciate the reference, I wasn't familiar with the ICAO noise standards.
If I'm reading things correctly it looks like Stage 5 caps out at 50dB, whereas a cursory search on the decibel levels for a supersonic boom comes up with 110dB.
That seems like a pretty large divide! Am I missing something?
Edit: A sibling comment appears to have addressed my confusion.
- foota 2y agoMy understanding is that Boom is planning to implement technology that prevents sonic booms as we think of them.
- 0x457 2y agoIIRC their goal is to deflect it upwards with their wing and fuselage design.
- JumpCrisscross 2y ago> cursory search on the decibel levels for a supersonic boom comes up with 110dB Short answer is we aren’t able to predict how loud a sonic boom will be [1]. Raw decibels produced at source is one thing. But you also have components like direction, dispersion (spatially as well as temporally) and frequency and how altitude and even moisture effect all that. We’re making progress [2]. But the conventional wisdom is you need a perceived loudness on the ground that matches subsonic airliners to have a hope in hell of FAA approval. (Would note that a sonic boom in this context is not a physical phenomenon but summary of perceptions. There will always be an acoustic reaction to supersonic flight. But the far field effects that characterise a “boom” aren’t inherent to supersonic flight.) [1] https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1007&context=mae_stures https://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1... [2] https://www.sciencedirect.com/science/article/pii/S0376042124000332 https://www.sciencedirect.com/science/article/pii/S037604212...