The blade pitch is fixed and you move up and down or left and right by speeding up or slowing down the main and tail rotors. Most mini rc helicopters take about 10 - 20 minutes to charge and can buzz around for about 5-7 minutes depending on the model.
Unlike a traditional R/C helicopter, micro or min rc helicopters are setup to always move forward. You control the hover height and right or left turns. By adding tiny weights to the nose of the copter before takeoff you can adjust how quickly the copter moves forward.
They're powered by a small brushed motor / pinion combination which turns a main gear that's attached to the main rotors. The secret behind their stability in the air is the weighted flybar. The flybar is attached to the main rotors and functions similarly to a gyroscope.
The gyroscopic action has a tendency to maintain it's axis of rotation relative to the ground and when no cyclic input is provided, it will keep the rc helicopter level.
There are no gyro's in mini rc helicopters like in conventional rc helicopters. Instead they have a trim switch which controls the speed of the tail rotor. Once you find the balance to counteract the rotational force of the main rotors, the tail will pretty much remain steady.
Monday, August 25, 2008
talk about mini rc helicopters
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