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Model 250-C20B/J
Power for the Bell 206B, MD Helicopters MD500, Erocopter B0-105
The C20B/J model is the cornerstone of the Model 250 engine line. With over 12,000 units delivered to date, the C20 is known worldwide for its for reliability. Since certification, the C20B has continuously benefitted from enhancements developed across the entire Model 250 product line. Recent improvements include a new first-stage turbine nozzle material that significantly extends the component’s life and maintains engine performance, along with improved gearbox lip-seals and shaft journals to reduce oil consumption. These improvements continue to decrease direct operating costs while increasing the mean time between removals. Many of these improvements can be installed by the Rolls-Royce Model 250 FIRST network of worldwide authorized repair and overhaul network centers.
Robust, proven, modular design
180 million fleet flight hours
Continued improvements for increased performance and reduced overhaul costs
Model 250 FIRST network of worldwide authorized repair and overhaul centers
Model 250-C20B/J
GTP_8276_01092007.indd 1
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Installation design
Basic engine specifications Model 250
C20B/J
Weight
158 lb
Power / weight ratio
2.7:1 3.45 lb/sec
Airflow Pressure ratio
7.1:1
Design speeds @ 100% rpm Power output shaft
6,016 rpm
Gas producer rotor
50,970 rpm
Power turbine rotor
33,290 rpm
Fuels
JP-4, JP-5, ASTM-1655, Type A, A1, B
Oils
MIL-L-7808, MIL-L-23699
Type certificate number
Shaft horsepower at takeoff
E4CE
Performance Sea level static rating
Minimum thermodynamic shaft horsepower
Sfc lb/shp-hr (max)
Model 250-C20B/J Takeoff (5 minute)
420
0.650
30 minute power
420
0.650
Max. Continuous
420
0.650
Normal Cruise
370
0.650
Cruise A (90%)
333
0.665
Cruise B (75%)
278
0.709
Rolls-Royce Corporation
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PO Box 420 Indianapolis, IN 46206-0420 Tel: (317) 230-5985 Fax: (317) 230-3381
While this information is given in good faith based on the latest information available to Rolls-Royce Corporation, no warranty or representation is given concerning such information, which must not be taken as establishing any contractual or other commitment binding upon Rolls-Royce Corporation or any of its subsidiary or associated companies.
