Go Down

Topic: Flywheel as quadcopter power source (Read 3015 times)previous topic - next topic

mauried

#15
May 08, 2013, 04:06 pm
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

#16
May 08, 2013, 04:29 pm
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

#17
May 08, 2013, 07:20 pm
Of course you're all correct.  At 10C you would have a very short cycle life.
If you fall... I'll be there for you!
-Floor

Skype Brighteyes3333
(262) 696-9619

kf2qd

#18
May 08, 2013, 07:21 pm
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

#19
May 09, 2013, 01:16 am
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.

Go Up

Please enter a valid email to subscribe