'Hybridising' will make helicopters a bit greener, by improving fuel economy and thus reducing emissions, as happens in a hybrid car
The idea is to turn them into hybrids so that, like hybrid cars, they are powered by a combination of an electric motor and a combustion engine . This will make them a bit greener, by improving fuel economy and thus reducing emissions, as happens in a hybrid car. But helicopter hybridisation brings other benefits too, especially when it comes to safety.
That might not seem much to shout about, but it is enough to give the pilot of a single-engine helicopter a much better chance of coping with an engine failure, by executing a tricky emergency-landing procedure known as autorotate.
The performance gain comes about in two ways. First, the electric motor can, in normal flight, provide the rotor with additional torque when a bit of extra power is required. Torque is a twisting force which electric motors are particularly good at delivering, and they deliver it much more rapidly than combustion engines can manage. It is this occasional boost from the electric system that helps reduce emissions.
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