Light rotorcraft maker Robinson Helicopter and biotechnology firm United Therapeutics recently ground tested an R44 modified with hydrogen fuel cells, and the companies say test flights are imminent.

ROBINSON HELICOPTER CO., WHOSE R22 AND R44 HELICOPTERS are powered by piston engines, continues to gain market share against turbine-powered helos. In the first six months of the year, Robinson sold ...

South African investigators have determined that the pilot of a Robinson R44 helicopter did not assess the risk of transporting a live penguin in the cockpit before the aircraft crashed just after ...