Rocket Propulsion: Rockets have been experimentally tried out on aeroplanes as motive power, particularly in Germany by Opel and Espenlaub. Rocket-assisted take-off is used by the Luftwaffe for overloaded bombers.
Its rocket propulsion system was highly unsafe, especially the early versions.
For these airplanes, engine efficiency is not as important as very high thrust. Modern military aircraft typically employ afterburners on a low bypass turbofan core. Future hypersonic aircraft will employ some type of ramjet or rocket propulsion.
Liquid-based propellants allow massive rockets to carry heavy payloads into Earth's orbit and beyond. Water bottle rockets provide a low-cost means for science teachers to instruct students on the basics of rocket propulsion.
 See also: Speed, Flight, Plane, Research, Force
  
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