AIRCRAFT INVESTIGATION

performance calculations for the Rolls Royce Eagle VIII WWI aero engine

Afbeeldingsresultaat voor Rolls Royce Eagle 250

Eagle VIII on display at the National Air and Space museum

Rolls Royce Eagle VIII liquid-cooled 12 -cylinder V-engine 360 [hp](264.8 KW)

introduction : March 1917 country : United Kingdom importance : *****

applications : Airco D.H.4, Handley Page O/400

normal rating : 360 [hp](264.8 KW) at 1900 [rpm] at 0 [m] above sea level

reduction : 0.6 , valvetrain :

weight engine(s) dry : 408.1 [kg] = 1.43 [kg/KW]

bore : 114.3 [mm] stroke : 165.1 [mm]

Mechanical efficiency/mean pressure correction factor : 0.526 [ ]

invloed hoogte > cm : 0.68 [ ]

compression ratio: 0.00 :1

calculated compression ratio : 5.20 : 1

high compression engine cannot run with full power/throttle at sea-level (only for short period)

published volume (displacement): 20.330 [litre]

calculated stroke volume (Vs) : 20.329 [litre]

compression volume (Vc): 4.842 [litre]

total volume (Vt): 25.171 [litre]

power / stroke volume (litervermogen Nl): 13.0 [kW/litre]

torque : 1331 [Nm]

engine weight/volume : 18.6 : [kg/litre]

average piston speed (Cm): 10.5 [m/s]

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intake pressure at 0 [m] altitude Pi : 0.95 [kg/cm2]

mean engine pressure (M.E.P.) at 0 [m] altitude Pm : 5.95 [kg/cm2]

compression pressure at 0 [m] altitude Pc: 7.88 [kg/cm2]

estimated combustion pressure at 0 [m] Pe : 31.51 [kg/cm2]

exhaust pressure at 0 [m] Pu : 3.80 [kg/cm^2 ]

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compression-end temperature at 0 [m] Tc: 594 [°K] (321 [°C])

caloric combustion temperature at 0 [m] Tec: 2244 [°K] (1971 [°C])

polytroph combustion temperature at 0 [m] Te (T4): 2371 [°K] (2098 [°C])

Afbeeldingsresultaat voor Rolls Royce Eagle 250

exhaust temperature at 0 [m] Tu: 1328 [°K] (1055 [°C])

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Thermal efficiency Nth : 0.338 [ ]

Mechanical efficiency Nm : 0.874 [ ]

Thermo-dynamic efficiency Ntd : 0.295 [ ]

design hours : 509 time between overhaul : 31

fuel consumption optimum mixture at 1900.00 [rpm] at 0 [m]: 90.68 [kg/hr]

specific fuel consumption thermo-dynamic : 214 [gr/epk] = 291 [gr/kwh]

specific fuel consumption (cruise power) at 0 [m] optimum mixture : 313 [gr/kwh]

estimated sfc (cruise power) at 3350 [m] rich mixture : 330 [gr/kwh]

specific fuel consumption at 0 [m] at 1900 [rpm] optimum mixture : 342 [gr/kwh]

estimated specific oil consumption (cruise power) : 15 [gr/kwh]

Literature :

Wikipedia

DISCLAIMER Above calculations are based on published data, they must be

regarded as indication not as facts.

Calculated performance and weight may not correspond with actual weights

and performances and are assumptions for which no responsibility can be taken.

Calculations are as accurate as possible, they can be fine-tuned when more data

is available, you are welcome to give suggestions and additional information

so we can improve our program. For copyright on drawings/photographs/

content please mail to below mail address

(c) B van der Zalm 29 February 2020 contact : info.aircraftinvestigation@gmail.com python 3.7.4