The earlier generation of liquid-fueled missiles had required constant maintenance and observation.
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U.S. officials say it appears to be a liquid-fueled, extended-range Scud missile.
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The liquid-fueled Rocket Labs booster features 3-D-printed engines and battery-operated electric motors.
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Our country, I'm sorry to say, has developed only one new liquid-fueled rocket motor since Apollo.
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Its Aeon engine, for instance, consists of just 100 parts, whereas a typical liquid-fueled rocket would have thousands.
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NASA wanted a reusable liquid-fueled booster system but parachuting a liquid-fueled rocket into salt water posed major reusability issues.
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So the engineers had been faced with designing a system whereby the liquid-fueled boosters could be recovered on land.
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In its ultimate incarnation, the liquid-fueled SLS will haul up to 143 tons, balanced atop five main engines and two bolt-on boosters.
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The first stage of the Antares rocket is built in the Ukraine, and uses a pair of Soviet-era liquid-fueled rocket engines .
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The liquid-fueled rocket was designed to haul payloads of up to about 1,256 pounds (570 kilograms) to low-Earth orbit.
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The space shuttle orbiter (the winged vehicle) would have three liquid-fueled engines at its tail, producing a total thrust of nearly 1.5 million pounds.
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"Volga" is the name of a new liquid-fueled retrievable and reusable (up to 50 times) booster-rocket engine.