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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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