RC (Remote Control) Helicopter flying has become a hobby for those who have the passion on helicopters. RC Helicopter flying is better than flying a real helicopter because it costs less and completely safe from crashing. There are different designs of rc helicopters like :
1. Toy electric helicopters.
2. Electric coaxial helicopter.
3. Electric fixed pitch helicopter.
4. Collective pitch helicopter.
Toy helicopters are the helicopters which does not have full directional control. Toy helicopters are easy to fly for beginners. Spare parts f this helicopter are not easily available meaning once the helicopter is damaged in crash it is impossible to get it up and running again.
Coaxial helicopters have two rotors mounted one above the other on a common axis. The rotors rotate in opposite directions. These types of helicopters are easy to learn to fly. The weight of these helicopters are from 50 gm to 250grams.
Electric fixed pitch rc helicopters are light weighted they are quite robust to crash. A fixed pitch helicopter flies very similarly to a collective pitch helicopters. Collective pitch helicopters has number of advantages over fixed pitch helicopters like they have better control response and ability to auto rotate. These are of two types i.e.
a. Electric collective pitch rc helicopters.
b. Nitro collective pitch rc helicopters.
Electric collective pitch helicopters are smaller models can be flown indoors in sports hall they can also be flown in large empty parks. The disadvantage of these types helicopters is that they are affected by the wind due to their low weight. They also have much more sensitive controls than larger helicopters. Nitro collective pitch helicopters generally starts from 3kg.Due to their size and large weight they requires dedicated flying site to fly so they cannot be operated without training . The extra size and weight make them easier to fly, but the crash costs are more.
Power Source of RC Helicopters:
There are two types power sources for remote control helicopters. These are:
1.Electric remote control Helicopters
2.Nitro Helicopters
Electric Helicopters are powered by batteries. The cheaper models use Nickel-Metal Hydride (NiMH) cells, whereas the better ones use Lithium Polymer (LiPo) cells .For the same amount of power LiPo batteries are much lighter than NiMH batteries .LiPo batteries must be charged with special LiPo charger and they must not be over discharged otherwise damaged permanently .Recharging a battery takes about an hour so regular flier must have two battery packs.
Nitro helicopters run on a liquid fuel containing methanol and nitromethane (for power) and oil (for lubrication). In general Nitro helicopters much larger than electric helicopters .It is very easy to refill fuel tank so nitro helicopters can be flown almost continuously as compared to electric remote control helicopters. Nitro helicopters come in different sizes like 15, 30, 50, 60 and 90. These numbers originated from the size of engine used in the different models. Some other sources of power like petrol but very small number of larger helicopters use this.
Although RC helicopters are generally used for recreational purposes, but sometimes they are used in applications such as filming, policing, and remote observation .Some companies make RC helicopters specifically for these uses.
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