Hybrid rockets are the kind of engine used by Rutan in SpaceShip One. They are a throttleable, re-startable solid rocket booster that are also very cheap to build, which gives them a lot of advantages. Rutan is using nitrous oxide, easily available at hot-rod shops, as the oxidizer and a rubber compound as the fuel, but other hydrocarbon solids can also work.
Want to play with this kind of device? Go here;
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Dr. Mordrid
Want to play with this kind of device? Go here;
Have phun
Dr. Mordrid
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