Types of R/C Helicopters
Common power sources are nitro (nitromethane-methanol internal combustion), electric batteries, gas turbines and petrol (gasoline).
Mechanical layouts include cyclic/collective pitch mixing (CCPM) in all power sources, fixed-pitch electric rotors and coaxial electric rotors.
Practical electric helicopters are a recent development but have rapidly developed and become more common, overtaking nitro helicopters in common use. Gas-turbine helicopters are also increasing in popularity, although the high cost puts them out of reach of most people.
Read more about this topic: Radio-controlled Helicopter
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