Turbine conversion information for

Hiller 12 E and Bell 47 Helicopters

Hiller / Bell 47 Turbine HelicopterTechnical Specifications and Performance Estimates

Principal Specifica tions Hiller/ Bell 47With the Allison 250 C20B Turbine Engine

600 Series Transmission 900 Series Transmissionempty weight 1650 1650maximum gross weight 2950 3200useful load 1300 1550engine rated max shp 420 shaft horse powerengine derated to 261 270% of engine potential used 61.9% 64.2%power to weight ratio .09 hp/ lb .08 hp/ lbservice ceiling (ft ) 16,000 16,000hover ceiling @ 3200 lbs in ground effect N/A 14,200 out of ground effect N/A 8,000hover ceiling @ 2950 lbs in ground effect 16,000 16,000 out of ground effect 13,800 13,800rate of climb maximum vertical 970 970 Maximum 1,250 1,250Vne (mph) 105 105maximum cruise (mph) 100 100Fuel (gal) Standard tanks 57 57 t otal with auxiliary tanks 96 96endurance @ 90 mph to empty standard fuel 2.56 hours with auxiliary fuel 4 hoursrange @ 90 mph to empty standard fuel 214 miles with auxiliary fuel 360 milesCargo Hook/External Load 1,000 pounds

THE WORLD’S MOST VERSATILE, COST-EFFECTIVE HELICOPTERS