Word: propellant
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Dates: during 1930-1939
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...September 1920, the 5-5 sank off the Delaware Capes. Evidence was that she, too, was flooded through the pipes which supply a subrftarine's Diesel engines and crew with air when on the surface. (Undersea, battery-driven motors propel a submarine, stored air supplies the crew.) A Board of Inquiry thereafter recommended steps to find out whether an automatic, interlocking control could be developed so that when air valves were open, the ballast tanks which weight a submarine with water and make it dive could not be filled...
...engine has 24 cylinders ar ranged in four banks like a double-V. Supercharged and built for streamlining into wings and fuselages, it develops 2,400 h.p., weighs less than a pound per horse power.† Its constant-speed propeller, largest ever built in the U. S., is geared to revolve at lower speed than the engine (because propellers lose efficiency at high speeds). Probable use of the new powerplant: to propel bombers faster than bombers have ever been driven before...
Independent on ice, they will neither stand up nor fall down but slide sideways, and some times sit down and propel like a pup with a bite...
...First, after the foot is placed, pointing straight ahead, in the foot-forward position without weight, we can, by raising the heel of the backward supporting leg shove or propel the trunk weight into the forward leg. This raising of the heel of the back leg to propel the weight of the trunk forward into space, until it rests over the advanced foot, is known as the propulsive step...
...neck), and which car ries a grappling mechanism like a clam dredge or steam shovel (the mouth). Thanks to muscles which act as motors, tendons which transmit tension and skeletal parts which serve as levers and fulcrums, the tower-like legs may change into powerful jointed springs which propel the whole structure forward...