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.
Gym flyer: These helis are flyable in larger indoor areas, and also outdoors when relatively calm. They are typically collective pitch helis up to about 600 grams.
Backyard flyer: These helis reqire a small outdoor field and are flyable in mild winds up to about 8 km/h (5 mph). 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!