2016年2月26日 · The expression "sound barrier" was created maybe 70 years ago when approaching the speed of sound made aircraft react in unanticipated ways. Actually, there is no fixed barrier, and in reality the transition can be rather smooth, provided the aircraft and its pilot are prepared for it. The speed of sound is the maximum speed with which small pressure …

2024年1月11日 · I’ve racked my brain and Google for a few years and can’t find an answer. I’m hoping someone here can help. In 1979 I flew from Chicago to Cologne, Germany. I distinctly remember the pilot informing us in an announcement that in a minute we would hear a loud boom and to not be alarmed. It was the sound of us breaking the sound barrier.

I don't think this had anything to do with military jets breaking the sound barrier nearby; it does sound more like strips of metal recovered from chaff dispensers on the jets; countermeasures systems which eject hundreds of strips or threads made of metal foil used to thwart enemy radars.

2020年2月10日 · The sound barrier is a function of airspeed and air density. If you have a strong enough tailwind, your ground speed would be above what most lay people would consider the speed of sound without breaking the actual sound barrier. Aircraft (or any object moving through the air alone) are governed by airspeed.

2019年5月14日 · People on the physics stackexchange recommended I ask here, so I am pasting my question regarding supersonic aircraft. I stumbled upon an interesting plot; in particular, the dependence of wave dr...

2017年7月18日 · The sound barrier has nothing to do with the noise the aircraft makes. It has to do with the fact that if it is going fast enough the air can't get out of the way. This creates a shock wave where the aircraft is pushing the air aside.

2016年10月23日 · Absolutely in no way was the 747 intended or designed as a supersonic aircraft; for many technical reasons having to do with structures and aerodynamic/fluid mechanics, a 747, if pushed to the sound barrier breaking speed in the vicinity of 674 MPH, plus or minus with respect to air density in which the big airliner is flying, or beyond this ...

2015年10月5日 · Fun fact (related to turbofans rather than -props): the very loud humming noise you hear on take-off inside a jetliner is in fact due to the fan blades breaking the sound barrier.

2019年8月20日 · Is it possible for the pilot to feel passing through the sound barrier in an F-16? What about other modern aircraft, will you feel anything? Do you need to go back to really dated designs before y...

2016年12月2日 · Eurocopter Blue Edge Wing; image from wired.com That varying the tip shape will affect the BVI and consequently noise, was well known (for example, see the NASA paper Evaluation of Helicopter Noise Due to Blade-vortex Interaction for Five Tip Configurations by Danny R. Hoad, which compares the sound produced by various tip shapes).