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Topic: Flywheel as quadcopter power source (Read 1 time) previous topic - next topic

mauried

Whats wrong with one of these?
http://www.hobbyking.com/hobbyking/store/__11954__Turnigy_nano_tech_4000mah_3S_45_90C_Lipo_Pack.html
90C discharge rate , thats 360 amps , and weighs 360 G .
The flywheel in the demo weighed 1 KG and was only able to light up some small leds.

Erni

Quote
I think the most important argument was the short time needed to speed up the wheel. If you could fly some minutes and recharge within some seconds, you would be flying much longer than with a battery with which you could fly for 20minutes but need 3hours to recharge.


With the battery that mauried mention you can charge with 10C, thats about 6 minutes.

With 2 batterys you can charge while flying, and keep going until forever

sbright33

Of course you're all correct.  At 10C you would have a very short cycle life.
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kf2qd

Just another thought -

If the flywheel idea was really practical, don't you think that we would have already seen it in use? The problem with a flywheel is that it requires mass and rotational velocity. the bigger the diameter, the more energy stored, but mass and rotational velocity are still going to be a problem. The less mass, the more rotational velocity required for a given amount of output. The more rotational velocity, the more losses do to friction, no matter how little friction you have. Below a certain speed you will get no usable energy out of the flywheel - that is a problem of efficiency...

mauried

Its not only the flywheel that requires mass.
Flywheels dont produce any energy at all unless they are mechanically coupled to an electrical generator, which also adds mass.
Adding mass to a helicopter is the last thing you want to do.

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