Nitro RC helicopters come in different sizes. These sizes are 15, 30, 50, 60 and 90 size. These numbers originated from the size of nitro engine used in the different models (0.15 cu in, 0.60 cu in and so on). The bigger and more powerful the engine, the larger the main rotor blade that it can turn and hence the bigger the aircraft overall. Typical flight times for nitro helicopters is 7-14 minutes depending on the engine size and tuning.
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