Rocket motors that burn gelled propellants (GRM - gel propellant rocket motor) are a new class of rocket motors. They combine the advantages of both solid propellant rocket motors (SRM) and liquid propellant rocket motors (LRM). The propellant is essentially solid in the tank and liquefied upon injection into the combustion chamber. The result is a variable-thrust rocket motor that is safer than SRMs or LRMs. Bayern-Chemie's propulsion system has now been demonstrated in two successful flight tests.
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