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Use for questions relating to flight at speeds greater than sound and related effects from doing so.

4 votes
Accepted

What would happen if the wing of a supersonic plane goes into the shock wave from the nose?

This is similar to a wing with a supersonic leading edge; something that has been quite common with Mach 2+ designs before swing-wing aircraft. …
Peter Kämpf's user avatar
3 votes

Why do suborbital planes feature H-tail and/or large wingtips?

The massive winglets on a very slender delta wing are needed for directional stability and for a successful landing as a glider. While a central fin also would provide directional stability, it would …
Peter Kämpf's user avatar
5 votes

What made the 2707 so superior?

Never to have been built could have a lot to do with that superiority. All designs start with high hopes and great specs, and only later, when reality interfers, the numbers have to be revised, mostly …
Peter Kämpf's user avatar
12 votes
Accepted

Acceleration of a supersonic aircraft after breaking the sound barrier

Practical supersonic aircraft have been designed to minimize the Mach drag peak. The ways to do this should be familiar: Stretch the aircraft lengthwise so it becomes long and thin. … Only when you have a poor design will drag actually become lower at low supersonic Mach numbers. …
Peter Kämpf's user avatar
11 votes

What causes the reduction in speed across the shockwave?

In supersonic speed, no information about the upcoming pressure change can travel forward, so the change is concentrated in the shock front. …
Peter Kämpf's user avatar
13 votes

Is there a boomless sonic technology in any state at this time?

By using the fact that the speed of sound is proportional to the square root of the air temperature, you can fly at a low supersonic speed at altitude and no shock wave would hit the ground. … Once the flight speed is increased such that it is also supersonic at ground conditions, audible shock waves will be hard to avoid. They can be mitigated, but not completely avoided. …
Peter Kämpf's user avatar
13 votes
Accepted

What are the advantages and disadvantages of a delta wing compared to a swept wing?

Since a low relative thickness keeps wave drag down (a drag component which occurs only in supersonic flow), this makes delta wings especially attractive for supersonic aircraft. … Delta wings are superior only in supersonic flight, and due to their good low speed characteristics they offer the best overall compromise for supersonic aircraft. …
Peter Kämpf's user avatar
4 votes
Accepted

Does lateral stability decrease during transonic flight? If so, why?

At supersonic speed, fin effectivity is further reduced by the now again decreasing lift curve slope as Mach increases further. …
Peter Kämpf's user avatar
3 votes

Why does centre of pressure (drag?) move forward when transitioning from transonic to supers...

The center of pressure does not move forward when transitioning into supersonic flight, but back. … more you move backward, the pressure difference between both sides is constant over chord in case of the supersonic airfoil. …
Peter Kämpf's user avatar
5 votes

Why are there no Mach 4+ fighter planes?

The planned successor to the SR-71 was supposed to reach Mach 4 to 5 but was never completed because of projected costs equivalent to almost 20 billion in today's dollars. But that was a reconnaissan …
Peter Kämpf's user avatar
4 votes

Is a supersonic ekranoplan possible? Would mach 1+ would disable ground effect?

From "Transonic and supersonic ground effect aerodynamics" by G. … This means that supersonic flight in ground effect requires a strong structure on the lower side! …
Peter Kämpf's user avatar
15 votes
Accepted

How are condensation cones created by supersonic airplanes?

It is important to note that the vehicle is not traveling at supersonic speed when condensation collars (rockets) or condensation cones (aircraft) occur. It is merely close to the speed of sound. … The low pressure area is instantly ended by a compression shock, when the supersonic flow around the aircraft is abruptly decelerated to subsonic speed by a compression shock. …
Peter Kämpf's user avatar
2 votes
Accepted

Supersonic Fuselage design

There is no ideal ratio. Make the wing as big as it needs to be for your take-off run, your cruising altitude or your approach speed, whatever demands the biggest wing, and make the fuselage just big …
Peter Kämpf's user avatar
13 votes

What is a high speed stall?

In all cases, the initial flow over the wing was locally mildly supersonic and produced a weak shock. …
Peter Kämpf's user avatar
22 votes
Accepted

Did the XF-84H Thunderscreech really cause "900 sonic booms per minute"?

I think it is a matter of where you stand (literally). From the front or the rear the shock waves from the propeller tips would hit your ears continuously, and the result would be constant noise. Wh …
Peter Kämpf's user avatar

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