how can a four-propeller drone spin in midair, parallel to the ground plane, when all of its propellers are pointing straight down?
In: Physics
A simple explanation:
Sit in an office chair, put your arms out. Then quickly twist so your arms go clockwise. The base of your body spin counterclockwise.
In a helicopter the blades spin one way, and the body will try to spin the other. This is what the tail rotor prevents.
There are some helicopters that don’t use a trail rotor. The Chinook has two rotors, the second one spins the opposite direction to balance it out.
In a drone, two rotors spin right, the others spin left. If they do so properly the drone doesn’t rotate.
By changing the rotation rate, slowing one rotor down you can unbalance it and the craft will spin a bit.
You can tip the craft in any direction by changing the speeds a bit to. Two in front spin slower, craft tips forward. It doesn’t rotate since those two are spinning opposite directions and are working in sync.
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