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26 votes
Accepted

Could we send a projectile to the Moon with a cannon?

Yes. One solution is a called a Wang bullet or Verne gun. The proposal actually aims to be capable of launching an intact payload (to Earth escape, and therefore also to the Moon). Obviously it would ...
Steve Linton's user avatar
  • 19.6k
11 votes

A Philae Lander (like) anchoring harpoons on M-Type (metallic) asteroid. Can a nail gun and the effect of Cold Welding be a working solution?

Taking the point of homogeneity, internal structure and our knowledge of so called M-type asteroids further. Given how data has been collected for some of the larger M-type asteroids there is still ...
Fred's user avatar
  • 13.1k
10 votes

Could we send a projectile to the Moon with a cannon?

Yes. No. It depends what you mean by "gun". Getting to the moon is, at the level of napkin math, basically reaching Earth's escape velocity of 11 km/s. Reaching the moon requires a bit ...
Yakk's user avatar
  • 573
9 votes

A Philae Lander (like) anchoring harpoons on M-Type (metallic) asteroid. Can a nail gun and the effect of Cold Welding be a working solution?

Answer: No, a nail gun can't cold weld to an asteroid. Grappling anything in space is problematic. Partially because almost everything has angular momentum, partially because any contact with the ...
Woody's user avatar
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6 votes
Accepted

What kind of "jet engine-like propulsion" does HyperSciences use to accelerate projectiles to sub-orbital altitudes?

The term "jet engine-like" is a bit misleading. It's more ramjet than turbojet. This is what happens: It consists of a long tube (barrel) filled with a mixture of combustible gases with a ...
Hobbes's user avatar
  • 128k
5 votes

What force would it take to launch a 100kg projectile into orbit from a big cannon?

1) Cannons don't fire projectiles above the propagation velocity of the propellant. That's nowhere near orbital velocity. 2) Orbital mechanics 101: Other than when conducting gravity maneuvers ...
Loren Pechtel's user avatar
3 votes
Accepted

Can I push the atmosphere out of the way?

Some starting numbers here would be that the leading hypersonic projectile will be scooping up a cylinder of atmosphere equal to the frontal area and it's traveled path. The first approximation of the ...
GremlinWranger's user avatar
3 votes

Could a sounding rocket or a space gun payload at apogee be put into orbit with a rocket impulse from there?

The orbital velocity for Low Earth Orbit is around 7.8 km/s. Accelerating to that speed requires that the payload of your sounding rocket or space gun be a rocket that itself has a Delta-v budget of (...
Kamil Drakari's user avatar
2 votes

Feasibility of a small mass driver?

If you launch a lump of metal from Earth's surface, then after less than or equal to one orbit it will re-intersect the surface of Earth. This is obviously the end for it. Therefore any gun proposal ...
2 votes

Feasibility of a small mass driver?

Gerald Bull's work on Project Babylon in the late 1980s was very promising and it seems likely that his system could have worked to get payloads into orbit. His systems were essentially very large ...
Roger's user avatar
  • 1,867
2 votes

Feasibility of a small mass driver?

The general concept of leaving all the heavy parts of a launcher have been investigated several times and the notes here remain relevant. The actual firing into space is quite possible, the difficulty ...
GremlinWranger's user avatar
2 votes

Feasibility of a small mass driver?

I can see 2 problems with your idea. First of all, if the object leaves the mass driver with anything like orbital speed, the driver had better be located very high. Otherwise, the payload will burn ...
hdhondt's user avatar
  • 1,194
2 votes

What technological hurdles prevent the development of a space gun?

I just saw Kinetic Launch system. It managed to perform a sub-orbital launch but plan is for a 2024 orbital one. It works by rotating an object and shooting it out with an extremely high speed. It ...
akostadinov's user avatar
2 votes
Accepted

More feasible geometries for counter rotating variable pitch mechanical launch system?

I'm the author of the paper you referenced. You are asking some great questions here! Is there any alternative to the geometry in picture above? Yes, as Woody pointed out, if the screw is spinning ...
phil1008's user avatar
  • 5,634
1 vote

A Philae Lander (like) anchoring harpoons on M-Type (metallic) asteroid. Can a nail gun and the effect of Cold Welding be a working solution?

“…on M-Type (metallic) asteroid)” Which one(s)? You presume not just monolithic asteroids but a monolithic type, in a deterministic and discrete typing system. That is, you presume too much. We have ...
caInstrument's user avatar
1 vote

Feasibility of a small mass driver?

A different approach to this topic is Skyhook assisted mass drivers. You don't have to get the ballistic container into orbit, just to the skyhook. From there the skyhook can grab it and fling it with ...
T.A. McKay's user avatar
1 vote

Why aren't rockets launched by a ground explosion through a gun barrel?

There are 3 main reasons: Cost Safety Increase in dry mass Otherwise its a great idea. The cost thing is fairly straight forward, just crawling along form storage to the pad required a 2,721 ton US$...
ANone's user avatar
  • 3,432

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