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Electric-feed rocket cycle. The oxidizer and fuel are fed to the pump which increases the pressure before injecting it into the combustion chamber. The pumps are actuated by an electric motor powered by batteries. An inverter converts the batteries' DC electricity to the AC needed by the motor.
The pumps (one for the fuel and one for the oxidizer) in electric-pump feed engines are driven by an electric motor. [19] The Rutherford engine uses dual brushless DC electric motors and a lithium polymer battery. It is claimed that this improves efficiency from the 50% of a typical gas-generator cycle to 95%. [20]
Some are also called warehouse utility vehicles, electric trolley carts, or powered platform truck vehicles. [1] Electric platform trucks can vary greatly in size, from large ride-on utility vehicles, to much smaller pedestrian operated trolleys. Electric tugs can be combined with nonpowered carts or hand trucks to achieve the same result.
A simple dumbwaiter is a movable frame in a shaft, dropped by a rope on a pulley, guided by rails; most dumbwaiters have a shaft, cart, and capacity smaller than those of passenger elevators, usually 45 to 450 kg (100 to 992 lbs.) [2] Before electric motors were added in the 1920s, dumbwaiters were controlled manually by ropes on pulleys.
The previous work of Laumeister at GE on the experimental Delta electric car that debuted in 1968 helped pave the way for the production of the Elec-Trak. [2] Despite the limited production and availability of the electric tractors, many Elec-Traks are still in use today [ 3 ] and have a cult following among tractor and electric vehicle ...
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While shopping cart theft has also been a costly matter for retailers, the higher cost of the motorized carts makes their theft a greater issue to the store, and thereby leads stores to establish policies prohibiting the carts from exiting stores, even though a disabled person may have the need to bring the cart all the way to their vehicle.
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