Classify by Engine There are four types of power used in them : battery, nitro, gas, and turbine.
Battery Power: Vast majority of them are powered by rechargeable battery. Recent advances in lithium polymer batteries allow an impressive amount of power to be stored in a lightweight package, and their makers made use of them to deliver many minutes of flight time in such a tiny package. More sophisticated battery powered helis (mini or midsize) can use replaceable battery packs (keep a couple charged ones around!)
Nitro Engine: For longer flight duration, a nitro engine is needed. Sometimes known as a "glow engine", this type of engine is closer to diesel in that it does not use spark plug, but use a mixture of methanol, nitro-methane, and oil, thus the name. Fuel is expensive though. These engines runs at extremely high RPM, up to 17000 and makes a very piercing screech when powered up. Some people call these "gas engines", which is not correct.
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Gas Engine: Some larger ones use a tiny 2-cycle gasoline engine. These don't generate as much noise as the nitro engines, and gasoline is available almost anywhere, and you just need some 2-cycle engine oil to go with it. On the other hand, they are pretty big for them , and generally only appear on full and large sized ones (see below on size classifications).
Turbine Engine: For the ultimate in realism, you can't beat a miniature turbine engine, but these are extremely expensive, though the power they can generate with such a small engine is truly amazing (that's why they are used in real helicopters!) Parts are hard to come by.
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Classify by Size The size of them(its "scale") vary greatly, from little 8-inch micro heli (eSky Blade mCX 300) to huge 60 inches (5 ft!) Bergen Intrepid. They are generally grouped into 5 classes
Micro -- your typical "toy" found in Brookstone, Radio Shack, and such, about 6-12 inch total, fits in palm of your hand, battery powered. Majority of the RC helis will be in this size category. Cost ranges from $15 - 125 depending on sophistication, flight time of about 3-8 minutes on a full charge. Electric-wise this is like 100 to 150 class.
Mini -- 12-24 inches in length, this is appearing at a discount in some hobby and toy stores. Most are battery powered, though more sophisticated version may use the smallest nitro engine available. Cost is between $30-300. This would be 200-350 class.
Midsize -- 24-48 inches in length, this is what the sophisticated flyers use to achieve those incredible aerobatic maneuvers such as upside down, barrel roll, and so on. Usually 6 channel control, and very often nitro fueled instead of battery fueled. Going by electric size this is 400-550 class. Nitro is probably class 30-60.
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Full Size -- 48 to 60 inches in length, these are not adversely affected by wind and can easily fly outdoors. In fact, they are so large you should NOT even try to fly them indoors (the exhaust fumes from the engines can be a problem). Their mass make them quite stable. This is the 600-700 class (of class 90 if you go by nitro engine size)
Large Size -- longer than 60 inches in length, size of a small child, these can easily reach ACTUAL speed of over 100 MPH (not scale speed!) and can easily be considered "drones". This can be powered by gas, nitro, or even miniature turbines. These are for very serious hobby flyers and usually requires some serious assembly. Now I believe that you have already had a general impression of the catergaries of the fantastic toys .Trust me ,if you are a faithful rc lover,you had better know more about it,because there is still so much fun and attrative things that you still don’t know about it.Then come and visit us!
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