On 7/3/2018 1:00 PM, Ken Norton wrote:
The speed reduction gearbox for a turboprop is a hefty piece of
machinery. The ones on the C-130 reduce the 13,000 RPM of the engine to 1,360
RPM for the props. And then there's the matter of power control. A fixed
pitch prop is not workable as the throttle response is horribly slow. It is
far more practical to use a fixed speed variable pitch prop. Throttle response
is almost instataneous.
That's old-school methodology. The new way of doing everything is to
have the smoke generator (turbine engine or ICE) powering a generator.
The props are driven by electric motors.
I crossed from Japan to the US on a ship that used this design. Turbine/generator in the noisy engine room. Room behind
with the rather large electric drive motor eerily quiet.
By going with a hybrid
approach you can use a smaller power source that is just large enough
to maintain average load requirement and use a limited supply of
battery storage to provide the boost for peak load requirement.
No such intermediary on that ship.
Travelin' Moose
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