Unmanned Helicopter‎: Yamaha R-MAX

The Yamaha R-MAX is a two-bladed, gasoline-powered, unmanned helicopter developed primarily for agricultural use in Japan in the 1990s.

The Yamaha R-MAX and its predecessor, the Yamaha R-50, were developed in response to demand in the Japanese market for aerial agricultural spraying. Fixed-wing crop dusters had been in use, but the small size of Japanese farms meant that this method was inefficient. Manned helicopters were sometimes used for spraying but were very expensive. The R-MAX allowed much more precise small-scale spraying, at lower cost and lower risk than manned aircraft.