Rotary-wing machines form a small but distinctive group among radio-controlled models, and it contains two quite different things. A quadcopter with four rotors and a camera holds its own station electronically and forgives a beginner a great deal. A single-rotor helicopter with a tail rotor answers every stick movement and wants hours of practice. Both will fly indoors, provided there is genuinely enough clear space.
Before a first flight, reckon on at least two metres of clear air above the machine and a room without curtains or a light fitting in reach. Outdoors even a light breeze works against it, so still early mornings are the window. If the exact shape of the aircraft interests you more than the flying, look at plastic helicopter kits, where the rotor head and cockpit can be built to the last detail. Spare rotors, blades and the small parts sacrificed first in any contact with the floor are in accessories for RC models, and the full branch of controlled machines in RC models and chuck gliders.
