Questions tagged [hypersonic]

Questions about flight at hypersonic speeds, typically defined as above Mach 5.

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3
votes
2answers
19k views

What are maximum G forces humans can survive?

I read that very high g forces could kill a pilot, brain pushing into the skull. Is there a way of decreasing or surviving these forces and how would it work if you ignore aircraft capabilities. If ...
14
votes
2answers
442 views

Why is a blunt trailing edge a better stabilizer at hypersonic speeds?

Here is what I read about the X-15 spaceplane: The X-15 had a thick wedge tail to enable it to fly in a steady manner at hypersonic speeds.[14] This produced a significant amount of drag at lower ...
2
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3answers
470 views

What is the maximum speed for regulation of sonic boom noise?

If fuel cost and fuel efficiency were not the issue, what is the maximum speed (air speed and ground speed) that business jets or airliners could travel at without exceeding the maximum noise and ...
32
votes
5answers
10k views

Why Didn't the USSR Build An X-15?

In the history of aerospace engineering in the United States, the X-15 is lauded as a critical and necessary step on the path to manned spaceflight. Throttle-able chemical rocket propulsion systems, ...
7
votes
3answers
9k views

Are there any planes that have ramjet or scramjet engines?

Are there any planes that have ramjet or scramjet engines? If so, how did they reach the required mach speed for the engines to start functioning?
5
votes
2answers
1k views

Is hypersonic flight possible with a Busemann's Biplane?

The modifications to the Busemann's Biplane design reported in this article have proven that it is possible to design a modified Busemann's Biplane wing design that actually produces lift at ...
4
votes
2answers
1k views

Can hypersonic aircraft be agile without the G forces harming the pilot?

I read that high G forces associated with hypersonic flight could kill the pilot. Is there any way of making this survivable yet keeping agility at hyper sonic speeds (irrespective of the plane's ...
1
vote
2answers
125 views

Does lift-to-drag ratio asymptote to 4 (or 6) at high Mach numbers?

The Kuchemann equations for L/D at high mach numbers, approximately verified by wind tunnel tests, were: $$\left(\frac{L}{D}\right)_{max} = \frac{4\cdot(M+3)}{M}$$ and, for wave riders $$\left(\frac{L}...
-1
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4answers
718 views

Spinning wing heat dispersion dynamics for Mach 24 and beyond?

Could a spinning disk dropped from orbit survive speeds faster than conventional aircraft in our atmosphere? Does the rate of spin matter when dispersing heat? Does a spinning disk create stability ...