They use solid propellant most frequently.

Rockets often spiral out of control if you put too much propellant in them.

But if you send a mining team there, without the return propellant, first (Laughter)

So the cost of the propellant is about .3 percent of the cost of the rocket.

We'll never get into space cheaply, because the propellant costs too much , or things like that.

The second is more than 90 percent of the weight of a vehicle is in propellant.

looked like a lighter trigger if it was a propellant that burns faster, I do not know

The American munitions are more aerodynamic and has a propellant that burns faster the results are dramatic.

Well, even as a boy at princeton university, they used to call me old liquid propellant frisby.

I figure, it's a man's patriotic duty to invent a liquid propellant if he has a mind to.

And so what a lot of people don't realize is, the cost of the fuel, of the propellant, is very small.

And in both cases, the cost of the propellant, the fuel and the oxidizer used, is about one one thousandth of that cost.

In fact, you can get it better you can get it at 14 times lower if you can find propellant on the moon.

Now, an airliner, carries just as much propellant as a rocket does, it's just as big, and they are actually far more complicated than a rocket is.