Living room flyer: These helis are flyable in small indoor areas and also outdoors when completely calm. They are typically fixed pitch helis using wide blades which are efficient at low headspeeds, and weigh up to about 350 grams.
Backyard flyer: These helis reqire a small outdoor field and are flyable in mild winds up to about 8 km/h (5 mph). These are typically collective pitch helis up to about 1500 grams. Not flyable indoors!
Large field flyer: These helis require a larger outdoor field and are flyable in winds up to about 16 km/h (10 mph. Not flyable indoors!