🚁 Helicopters
🚁 Size Class (450 / 500 / 700)
The shorthand numbers used to describe how big a helicopter is, from small park-size machines up to large 3D airframes.
The number is a class label that roughly tracks rotor size rather than an exact measurement of anything, so always check the actual blade length a model takes before ordering parts. Bigger machines are steadier in wind but far less forgiving of a mistake.