Turbine: 1 Leonardo, 2 Bell, 3 Airbus, 4 Sikorsky, 5 MD. Piston: 1 Robinson Leonardo is winner in turbine division for 7th consecutive year. Robinson leads in piston, placing #1 for 22nd year in a row. MD comes back to rank in turbine category. Results are based on 415 survey forms – a 23% return […]