AA-9s packed enough solid fuel to give them a flight time of about two minutes.
The pipe is filled with solid fuel to heat the water in the surrounding container.
The other was for a two or three stage rocket using solid fuel.
I don't know if they are solid or liquid fuel.
As it turned out, rockets using solid fuel eventually provided the answer to the problem, but by then the technology had been developed.
The solid fuel burned at so many inches per second.
Do you have room to store oil or solid fuel or wood?
Many homes around the world used solid fuels for cooking.
In some areas, smokeless coal is often the only solid fuel used.
They must be made more stringent for solid fuels also, especially coal.
