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London buses equiped with flywheels

[Source pic]
Pilot project involving 6 buses. Expected fuel savings up to 30%. If successfull, implementation on all 4,000 companies fleet buses could be considered. In essence, rather than wasting kinetic energy as heat in breaks, it is transformed in kinetic energy of a rotating flywheel (‘mechanical battery as it were’). This energy again is used to bring a bus up to speed from standstil and thus the bus engine saves fuel. Return on investment with current high fuel prices estimated to be five years.

[Guardian]

Discussion of application of flywheels in vehicles:

Animation:

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