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Flywheel

noun

Noun

1
A rotating mass used to maintain the speed of a machine within certain limits while the machine receives or releases energy at a varying rate, or as a form of energy storage.
"They were fitted with flywheels 25 ft. in dia. and weighing 50 tons each. The energy stored in such flywheels is very great, and in this case was of the order of 7,000,000 lb./ft. each."
2
regulator consisting of a heavy wheel that stores kinetic energy and smooths the operation of a reciprocating engine wordnet

From fly + wheel.

Unscramble this word: flywheel