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www.rolls-royce.com
Model 250-C20B/JPower 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
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Model 250 C20B/J
Weight 158 lb
Power / weight ratio 2.7:1
Airflow 3.45 lb/sec
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 E4CE
Basic engine specifications
Sea level static ratingMinimum
thermodynamic
shaft horsepower
Sfclb/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
Performance
Installation design
Shaft horsepower at takeoff
Fuel flow at takeoff
© 2007 Rolls-Royce Corporation GTP 8276 (01/07) www.rolls-royce.c
While this information is given in good faith based on the latest information ava ilable to Rolls-Royce
Corporation, no warranty or representation is given concerning such information, which must not b e ta
as establishing any contractual or other commitment binding upon Ro lls-Royce Corporation or any of itsubsidiary or associated companies.
Rolls-Royce Corporation
PO Box 420
Indianapolis, IN 46206-0420
Tel: (317) 230-5985Fax: (317) 230-3381
® ® ®
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