The solid propellant ram rocket or ducted rocket is a ramjet type air-breathing propulsion system. A gas generator with an oxygen deficient composite propellant produces fuel rich combustion products for afterburning with air in the ramcombustor. During missile flight the supersonic air is compressed by deceleration in the intake system and allows efficient combustion and thrust generation. The incorporation of high energy ingredients in the gas generator propellant leads roughly to a threefold increase in specific impulse of the ducted rocket compared to a conventional solid rocket propulsion system.
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The pressure sensitive burning rate of the propellant in connection with a gas generator throat control valve allows a thrust modulation by throttling the gas generator. The use of gas generator control produces variable thrust and allows a flexible missile mission envelope. The ramcombustor chamber incorporates an integrated nozzleless booster to accelerate the missile to the velocity (approx. 2 Mach) where the ram rocket system can take over. BAYERN-CHEMIE is world-wide leader in throttleable solid propellant ram rocket technology covering
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 air intakes for various Mach-ranges
intake closure and port cover mechanisms during the boost phase
high energy (boron filled) throttlaeble gas generator propellant
gas generator throat control valve
boost motor, smoke reduced, nozzleless for avoiding ejection of particles
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The solid propellant ram rocket offers advantages conderning
high sustained range
high average speed
flexible mission envelope by active thrust control
wide operational envelope from sea level to high altitude
relatively simple design
logistic similar to conventional rocket motors
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