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Questions tagged [supersonic]

Moving at greater than the speed of sound, which is Mach 1. Relevant to movement through an atmosphere, but 'Mach x' may also simply indicate a speed. At above Mach 5 or 6, the term 'hypersonic' is used.

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8
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1answer
1k views

Why should be velocity through the nozzle throat be sonic?

I have read (even on this site), that exhaust gas velocity is (normally?) sonic (exactly Mach 1) through the choke point of a De Laval, or convergent-divergent, nozzle: At the "throat", where the ...
11
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4answers
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Do launching rockets produce a sonic boom?

I've been watching rocket launches, and the commentator often remarks when the vehicle has gone supersonic. There is presumably a sonic boom at this point, right? Is it just that we don't hear it on ...
3
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4answers
1k views

Could you use a hypersonic space plane to fly into space?

Is it possible to use a hypersonic jet that goes at extreme speeds in the atmosphere, then once it's at a high altitude it points down to just above the horizon and speeds up. Then it flies by that ...
12
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1answer
4k views

How effective are Falcon 9 1st stage grid fins in the last few seconds before landing?

This answer discusses the three methods that the Falcon 9 1st stage uses for attitude control during re-entry and landing. They are: cold nitrogen jets, "hypersonic" grid fins, and thrust vectoring of ...
4
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1answer
193 views

Modelling for the LDSD parachute - what are the issues with scale models and software simulations?

The LDSD1 parachute is too large to test in any current wind tunnel, the only test possible on the ground was the rocket sled test. In this NASA Edge episode (starting at 15:12), Ian Clark talked ...