What sizes do model helicopters come in?
Generally, model helicopters come in either 30 or 60 size. This refers to the capacity of the engine and reflects the size of the model. A 30-size helicopter has an engine capacity of .30 cubic inches or 5cc. Has a rotor diameter of approximately 1.2 metres and weighs about 2.5kg. A 60-size model has a rotor diameter of about 1.4m and weighs about 5.5kg. The engine being .60 cubic inches or 10cc in capacity.
