Quote:
Tri-D is only about 7 in (17.7 cm) long and weighs about 10 lb (4.5 kg). Made of a chromium-cobalt alloy, it burns kerosene and liquid oxygen and produces about 200 lb (90.7 kg) of thrust.Comment:
A real live rocket engine printed and tested.
It is made of somewhat exotic stuff though. What if you could make one of these with materials available at a landing site on Mars, and then use it to return samples to Earth?
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