Model 250  
Initial Operational Capability (IOC):
Total Production: 29,000
Also Known As: Allison 250, Model 250-C20, Model 250-C20R, Model 250-C20W, Model 250-C30, Model 250-C40, Model 250-C47, T63 and T703
Origin: United States of America
Corporations: Rolls-Royce
Parent System: Model 250
Initial Operational Capability (IOC):
Total Production: 31,000
Family Members: Model 250-B17F
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Description: The Rolls-Royce/Allison Model 250 is a compact turboshaft engine designed to power both civil and military helicopters. Developing between 420 and 715 shat-horse-power and featuring a two-shaft modular design. It was originally developed as the T63 to meet the requirements of the US Army for a small turboshaft engine. Rolls-Royce has delivered nearly 30,000 Model 250 engines which have logged over 160 million flight hours. Currently, there are 16,000 Model 250 engines in service. Rolls-Royce has developed turboprop, generators and turbojet applications based on the Model 250 design.
Currently, the Model 250 is available in Series II and Series IV both equipped with FADEC (Full Authority Digital Engine Control) control. The Series II Model 250-C20 engine powers the Bell 206B, TH-67, MD-500, MD520N, AS355 and BO105 helicopters. The Model 250-C20R is an improved version featuring enhanced performance and economy. Series IV turboshafts (Model 250-C30/C40/C47) provide up to 715-shp and power the Bell 206L, Bell 407, Bell 430, MD530 and MD600N helicopters. The OH-58D, AH/MH-6, RQ-8 Fire Scout, Ka-226, PZL SW-4 and Groen Brothers Aviation Hawk 4T aircraft are powered by Model 250 engines.

Model 250 Applications

Combat Helicopters BO 105 OH-58D Kiowa Warrior OH-58F Kiowa Warrior Commercial Helicopters AS355 Ecureuil Bell 206 Bell 407 Bell 430 Enstrom 480 Ka-226 MD-500 MD-600 Schweizer 333 Tactical Support Helicopters MD-540F Tactical Unmanned Rotorcrafts MQ-8B Fire Scout MQ-8C Fire Scout RQ-8A Fire Scout

Model 250 Specifications

Fan Pressure Ratio: 9.20
Diameter: 21.9 inch (556 millimeter)
Length: 41 inch (1,041 millimeter)
Max Output Power: 650 shp
Max Power at Cruise: 600 shp
Dry Weight: 274 pound (124 kilogram)
CEP: Circular Error Probable
Meters (m)   Kilometers (km)   Nautic Miles (nm)   Inch (in)   Yard (yd)   Foot (ft)   Millimeter (mm)
Pound (lb)   Kilogram (kg)   kN (KiloNewton)   Ton (t)
Meters per Second (mps)   Kilometers per Hour (kph)   Knot (kt)   Miles per Hour (mph)
Liter (l)   Galon (gl)
Year (yr)   Minutes (min)   Second (sec)
Shaft-Horse-Power (shp)

Model 250 News

There are 10 news between
1 Mar 2007 and 16 Mar 2011
Wednesday, March 16, 2011US Army MD 530F Selected for the Rotary Wing Primary Training Aircraft Program
Tuesday, February 23, 2010Rolls-Royce and Aeropower Sign Model 250 Engine Totalcare Agreement
Sunday, February 21, 2010Rolls-Royce Awarded US Army Contract for new Model 250 Engine FADEC
Sunday, February 22, 2009Rolls-Royce and Bell Helicopter Sign Model 250 Engine Agreement
Wednesday, December 10, 2008FMS: Iraq Requests 26 Bell 407 Helicopters along with Related Munitions
Wednesday, July 30, 2008FMS: Iraq Seeks 24 Armed Helicopters and Related Munitions
Thursday, March 1, 2007Rolls-Royce, Air Evac Lifeteam Upgrade Medical Aircraft
Rolls-Royce Joins with Heli-Lynx for AS355 Upgrades
Rolls-Royce and CALSTAR Join to Upgrade BO105 Fleet
Rolls-Royce and Bell Offer Upgrades for 206L1 Aircraft

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