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Discussion in 'Bad Dog Cafe' started by uriah1, Oct 18, 2021.
Whoa I wonder how long that’s really been around
Very, very cool.
I remember, as a kid, living in and around Air Force Bases hearing sonic booms fairly regularly.
Band name alert!
I would have loved to read a bit more about how the reduced the boom; I am assuming this is related to air velocity over body panel and low pressure / high pressure zones with gets into coefficient of drag.
I have been wanting to post "OK, boomer!" but I have thus far resisted the urge.
Lots of sonic booms when I was growing up in WA state. Is it true that pilots started breaking the sound barrier vertical rather than horizontally?
In the mid sixties, one boom, however, was the real deal. A fighter jet in trouble was kept away from populus areas as the pilot steered into the hills outside of town. He chose not to eject.
I kinda miss hearing the dishes rattle when the sonic boom happened. I also miss the C-130’s flying low over the lake.
Definitely a thing I heard growing up in the St. Louis area. Probably shouldn’t have been doing it where it could be easily heard in residential areas, but as a kid, it was nothing but cool.
When I was a kid the boom made by the afterburner kicking in on Wis Air Guard F-102s flying out of Madison were often confused with sonic booms.
Yes, they experienced in dives the compressability that occurs on approach to the mach in WWII when the aircraft had enclosed cockpits and were the fastest they had ever been. They did not have good knowledge of it them, or that the speed of sound is variable depending on factors such as temperature, humidity, and pressure.
I heard the 'booms' a lot as a kid growing up in North Bay, Ontario, Canada...a small city that has an air force base....it was/is part of NORAD. It was a pretty common sound now that I think about it. I haven't heard a boom for many years now.
The predecessor to that plane was this DARPA modified Northop F-5E:
Darpa does all the fun things.
Didn't they invent the internet, per se.
Not on purpose, and they usually died as a result. There are some reports of flights in WW2 from both the Allied and Axis sides where the plane was pretty clearly either in the transonic range (where flow over parts of the plane are starting to go supersonic) or supersonic.
One of the major problems they had to solve to successfully fly supersonic was pitch control. When supersonic air hits a hinge line, it causes a shock wave. Behind that wave is low pressure, so a control surface there doesn't have enough airflow to be effective. This is why jet fighters move the entire tailplane instead of having elevators.
Did you see any of the video of the boom at Oshkosh back in August?
The aircraft manufacturing business is a tough one. The Aerion AS-2 is another failing or failed effort.
Established companies like Gulfstream and Sukhoi spent a good deal of money on a project and did not succeed.
Cool. I think they'll get there eventually. it won't be completely without a sonic boom at some level because the atmosphere is really, really important and stuff. But it could absolutely be minimized to very low level that you might not notice on the ground. Planes don't need flattened frontal shapes or areas to achieve lift and frankly anything can lift with enough thrust.
I did a senior research project at AEDC where we surface heated the upper skin of airplanes (models) and the lift was improved with less thrust energy required for takeoff because you could control where the friction was applied. They have a massive compressor driven supersonic wind "tunnel". Point is there are a number of ways to reduce the shock wave. It is really exciting to see this kind of engineering. It's not about beating physics, it's about applying it.
Come on over and sit a spell, let's talk about gas dynamics.
Marshall amps successfully performed sonic boom trials in 1972.
aks Ritchie Blackmore