Figure 3-3. When perfectly balanced, the prop should be able to
sit in the balancer in any position without falling in one direction
or the other.
Balancing Video
Still not sure how to go about balancing your props? We have a
video that shows you exactly how it’s done, step by step.
Motors
One major
dierence between our quadcopter’s power train and
your car’s is that we use a direct-drive system rather than a
transmission. With your car, you have one main source of power:
the engine, which is connected to the transmission, which
divides that power among the wheels that need it. With direct
drive, each wheel, or prop in this case, is directly attached to its
own power source. For our quads, the power source is a brush-
less motor.
46 Make: Getting Started with Drones
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