Model by Year - full listing of RC helicopter indexed by year of introduction. Pre 70 - This period highlights the many approach's to the problems of achieving a practical radio control model of a helicopter. 1970 - Finally a 'successful' model Radio controlled helicopter from Dieter Schlüter though a number of others were closely on his heels. First commercial kit of a RC helicopter with a redesigned Cobra from Dieter Schlüter. 1971 - Consolidation year for Dieter Schlüter with displays in the US plus a development year for others trying to catch up though only Kalt brought out a helicopter; the Cobra 450. 1972 - First demonstration in the UK and USA of Dieters RC 'Cobra' Helicopter plus the first US nationals helicopter competition. Dub-Ro (USA) brings out the Whirlybird 505 designed by Dave Gray and Kalt bring out a second helicopter and a portent of things to come from Japan. 1973 - First UK Helicopter design competition resulting in the first UK manufacturer plus three more German manufacturers producing their first kits and a successful 'home' manufacture of a kit from Switzerland. Helicopters competitions becoming more frequent and better attended / organised. 1974 - UK manufacturer Micro-Mold brought out the Lark; first of the small 'affordable' helicopters; 'Pod and Boom' layout with the single side frame that was to become the standard for the more 'basic' trainers. First production gyro brought out by Kavan though it was expensive and did require to be soldered into the tail rotor servo internal wiring. First RC helicopter controlled from a 'full size' machine followed by the first cross channel flight of an RC helicopter.