Aviation Geeks unite?! Anybody else care about planes here?

[publiusr]

I wonder if that would make more sense on Titan…. low gravity but still has a think atmosphere.

Combo rover wheels and airfoils

Ironically, the Enterprise shape does better at high speeds over Star Wars ships?

Hypersonic Propulsion News and Developments

LOL at SpaceNews' crappy new website design. :rolleyes: https://ai.spacewar.com/apex/r/a234249/fasterrocket/spx?p63_id_1=304605 New DOD-funded project will develop morphing hypersonic engine Illustration of scramjet hypersonic propulsion engine design by UCF, which will be used to...

www.secretprojects.co.uk

 

[Gingerbread Demon]

OK two interesting links, one in text and a fun video

No One Can Explain Why Planes Stay in the Air

Do recent explanations solve the mysteries of aerodynamic lift?

www.scientificamerican.com

And the fun video

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[publiusr]

As it turns out, flow around a simple cone becomes problematic in the hypersonic regime;

https://scitechdaily.com/mach-16-mayhem-supercomputer-uncovers-chaos-in-hypersonic-flows/

 

[Kamen Rider Blade]

As it turns out, flow around a simple cone becomes problematic in the hypersonic regime;

https://scitechdaily.com/mach-16-mayhem-supercomputer-uncovers-chaos-in-hypersonic-flows/

So would Mach 16 be a new temporary "Speed Barrier"?

 

[Gingerbread Demon]

So would Mach 16 be a new temporary "Speed Barrier"?

No idea, but what goes that fast anyway?

 

[Kamen Rider Blade]

No idea, but what goes that fast anyway?

Only the Space Shuttle & Rockets escaping Earth's Gravity.

Most vessels & vehicles don't travel that fast in atmosphere.

 

[Gingerbread Demon]

Only the Space Shuttle & Rockets escaping Earth's Gravity.

Most vessels & vehicles don't travel that fast in atmosphere.

OK didn't realise rockets travel around that fast at launch

 

[Kamen Rider Blade]

OK didn't realise rockets travel around that fast at launch

Oh, those can go WAY faster.
The Space Shuttle needs to maintain Mach 22.808 or (17,500 mph) to maintain Orbital Velocity.

But the Space Shuttle isn't trying to fly consistently within Atmosphere, it's in LEO (Low Earth Orbit), well into the Vacuum of Space.

So that's a completely different problem that they are trying to solve.

Intentionally flying that fast while still in Atmosphere is a different challenge.

Remember this fun little fact:
401,280' = 76 mi = 122.310 km ~ 122 km = Space Shuttle uses Aircraft Control Surfaces instead of Steering Thrusters AKA (RCS).

So the Maximum Altitude you can fly before you basically need RCS for control of your vehicle is that hard limit.

Ignore the 100 km Karman Line or USAF's 50 mi definition of what altitude "Space is".

IMO, if your vehicle can use Aircraft Control Surfaces to steer, then you're within Atmosphere, even if it's the furthest edge of that definition.

The moment your vessel requires RCS to properly manuever, you're in the "Vacuum of Space".

IMO, that should be the new definition of what Altitude should Space officially be.

 

[publiusr]

An odd effect has been seen in fluids:

An exception to the laws of thermodynamics: Shape-recovering liquid defies textbooks

A team of researchers led by a physics graduate student at the University of Massachusetts Amherst made the surprising discovery of what they call a "shape-recovering liquid," which defies some long-held expectations derived from the laws of thermodynamics.

phys.org

Gelled fuels: Luminal-A, Alumizin, etc

Michel Van: "One Moment Luminal-A ? was Glusko also in Alumizine propellant ?!" Right, luminal-a is soviet analog of american alumizine. Some theoretical works was conducted at OKB-456 (chief designer V. P. Glushko; today NPO "Energomash"), then conducted some static fire tests. OKB-456 has...

www.secretprojects.co.uk

I wonder if that could be used in MHDs?

 

[publiusr]

A horrible accident has occurred—here the chopper fuselage fell independently of the tail rotor?

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[Gingerbread Demon]

A horrible accident has occurred—here the chopper fuselage fell independently of the rotor blades that came down like a giant shuriken

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That happened last week, what the heck is going on with aircraft lately? is it a lack of proper care and maintenance?

 

[XCV330]

OK didn't realise rockets travel around that fast at launch

They don't. They build speed over time. At Max-Q, for instance, the highest aerodynamic pressure on its body at launch, Falcon 9 is only doing around 1000mph and is just entering the stratosphere (about the same as the Space Shuttle). Launch vehicles don't reach those high hypersonic mach numbers until they are well out of most of the earths atmosphere.

A scramjet missile needs to stay in atmo to breathe enough air to keep its engine running. They'll be built to withstand that kind of extreme heat, just like an ICMB's MIRV is (Rapid deceleration before deployment over ground target) . That whole problem of airflow at those speeds has been a problem for years. If you ever look at the old F4 Phantom 2, you'll notice those odd vertical panels between the air intakes and the fueselage: those were used to automatically slow air down going into the intakes at really high speed to keep the supersonic air from hitting the engines. Other really fast jets like Concorde had similar solutions to the problem.