Wednesday, July 29, 2009

Breakin the Sound Barrier>>>




Condensation of water is caused by the rapid expansion and consequent adiabatic cooling of air parcels induced by the shock (expansion/compression) waves caused by the planes outrunning the sound waves in front of it.

5 comments:

Viktor said...

The picture with the helicopter is fake. Look at the background of the sky, it's exactly the same as the background with the plane. 1 of them is fake.

PeaceVet said...

I agree, I do not think helicopters can travel that fast because the wing moving forward has to travel twice as fast, and the rearward moving wing has no lift at high speed. This causes the craft to go into a roll. Also, I don't think a Stearman can do that either, and it certainly would not create a square shock wave. I doubt it is real either.

Anonymous said...

The helicopter one is the fake by sheer fact that the fastest helicopter recorded was the Westland Lynx 800 G-LYNX, clocking in at 249.1 mph.

The speed of sound (which the helicopter would have to reach to produce the sonic boom) is 768mph IIRC, which is over three times what the Lynx hit.

Even if the said Lynx could reach that speed, in truth, the main rotor would become so ineffective at that speed to the dissymmetry of lift (essentially means that one side of the main rotor is produce far less lift then the other side) would mean that the helicopter would probably crash long before it reaches that speed.

Kevin P. said...

Viktor, a helicopter cannot go Mach, the blade entering and exiting (due to the rotation) the sound barrier would rip it to shreds.

Kevin P. said...

Also, the helicopter's blade entering and exiting the sound barrier, due to rotation, would destroy the blade.