Questions tagged [hypersonic]

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

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1answer
112 views

What rotors would be best for atmospheric reentry?

What rotor blade set up would be the best for entering Earth atmosphere or to shed speed before landing in place of a parachute? I understand that the longer blades are more efficient, but are not as ...
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1answer
190 views

Could liquid alkali metal fuels be used for ramjet/scramjet propulsion?

In particular, I'm thinking about lithium, but sodium could be considered as well. Lithium has low molecular weight, very high propellant density, and low melting point. At sufficiently high ...
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1answer
44 views

Are there any special considerations involved in designing manual flight controls for supersonic/hypersonic aircraft?

What things, if any, might need to be taken into account in the design of manual flight controls for supersonic or hypersonic aircraft that wouldn’t need to be taken into account with manual controls ...
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1answer
271 views

Can electro-aerodynamic propulsion be applied to circumvent sonic BOOM

MIT researchers have created and flown the first plane that doesn’t require any moving parts. and I quote "“Although it is still a long way off from commercial gas turbine propulsion … ...
5
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2answers
242 views

Could hydrazine be used as a scramjet propellant?

Hydrazine is used a monopropellant in Satellite OMS rockets. But interestingly enough, it's highly exothermic decomposition into ammonia, nitrogen, and hydrogen provides heat for an endothermic ...
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3answers
184 views

What mechanism or design aspect prevents jet blast from escaping the front of a Ramjet or scram jet?

Enormous air pressures result in the thrust of a Scram jet or ramjet engine, more so the pressure required to drive the aircraft forward at supersonic and hypersonic speeds. Given that these engines ...
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1answer
478 views

What technical problems stopped scramjets from being used on hypersonic aircraft?

I have been researching hypersonic aircraft and scramjet engines after running a few calculations looking at ramjet/rocket hybrids for making single stage to orbit vehicles. After doing the analysis ...
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2answers
173 views

Would pressurised air holes on supersonic aircraft mitigate the heat problem?

Would air holes or tubes of 50mm diameter blowing pressurised air outside the surface of a hypersonic or supersonic aircraft mitigate the problem of heat? They would be placed such that when they blow,...
4
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3answers
498 views

Is there currently any heat shielding and paint for speeds of up to Mach 6?

The Blackbird SR71 could travel faster than Mach 3 but its speed was limited to prevent its skin from melting. Its newer variant is said to be named the SR72 and it and other, civilian hypersonic ...
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1answer
430 views

What is the theoretical maximum speed of a rocket-powered aircraft in the atmosphere?

I read that the scram jet has a theoretical maximum speed of Mach 24. What is the theoretical maximum speed of a rocket-powered aircraft designed to operate in the atmosphere?
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1answer
147 views

Would a rotating skin design mitigate the heating problem limiting hypersonic flight?

Would a rotating skin design - where the skin of the aircraft rotates (powered either by an electric motor or the colluding wind) - mitigate the heating problem limiting hypersonic flight? Would a ...
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3answers
5k 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?
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4answers
644 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 ...
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3answers
3k views

Won't sonic booms prevent Space X's BFR intercity transport plan from being acceptable?

Considering that Space X have just announced that their BFR can take anyone anywhere in the world in under 1 hour, that would be enormous speed, does this rocket not produce sonic boom? If not is it ...
3
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1answer
501 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 ...
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3answers
316 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 ...
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0answers
81 views

Sonic boom impediment to hypersonic passenger flight [duplicate]

Given that the ramjet and scram jet engines could achieve hypersonic flight, is sonic boom the major impediment to passenger hypersonic flight today? If so, why is it that space shuttles could travel ...
4
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3answers
326 views

Can a plane with air-breathing engines in level flight achieve enough velocity to make a single orbit?

A rocket uses engines that carry both fuel and oxidizer. Most are composed of multiple stages and lift a payload to orbit. They are able to burn their engines anywhere in or out of Earth's atmosphere ...
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2answers
8k 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 ...
4
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2answers
769 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 ...
11
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1answer
477 views

Why does linear airfoil theory break down at hypersonic speeds?

Why can't we just extend linear supersonic theory beyond M = 5? I've looked at NASA papers discussing everything from geometric effects, air disassociation, and thermal coupling, but no clear and ...
2
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1answer
468 views

Does waverider have much lower drag than Sears Haack body?

I tried to calculate drag for hyper velocity project using this paper for Sears Haack revolution body. Some parameters: Diameter: 160mm (round number for simulating 155mm projectile) Fineness ratio: ...