Bristol Jupiter VI|aircraft investigation|aircraft engines

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performance calculations for the Bristol Jupiter VI aircraft engine

Bristol Jupiter VI air-cooled 9 -cylinder radial engine 440 [hp](328.1 KW)

introduction : June 1925 country : United Kingdom importance : ***

applications : Fokker F.VIIa

normal rating : 440 [hp](328.1 KW) at 1700 [rpm] at 0 [m] above sea level

no reduction, direct drive, valvetrain : overhead poppet valve

design : Roy Fedden

fuel system : oil system :

weight engine(s) dry : 354.0 [kg] = 1.08 [kg/KW]

bore : 146.0 [mm] stroke : 190.5 [mm]

valve inlet area : 39.0 [cm^2] two inlet and two exhaust valves in cylinder head

gasspeed at inlet valve : 32.6 [m/s]

optimum mixture

throttle : 90 /100 open, mixture :13.0 :1

compression ratio: 5.30 :1

calculated compression ratio : 5.30 : 1

stroke volume (displacement): 28.7 [litre]

compression volume (Vc): 6.675 [litre]

total volume (Vt): 35.379 [litre]

diam. engine : 141 [cm]

specific power : 11.4 [kW/litre]

torque : 1843 [Nm]

engine weight/volume : 12.3 : [kg/litre]

average piston speed (Cm): 10.8 [m/s]

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intake pressure at 0 [m] altitude Pi : 0.89 [kg/cm2]

mean engine pressure (M.E.P.) at 0 [m] altitude Pm : 6.52 [kg/cm2]

compression pressure at 0 [m] altitude Pc: 7.15 [kg/cm2]

estimated combustion pressure at 0 [m] Pe : 28.57 [kg/cm2]

exhaust pressure at 0 [m] Pu : 3.49 [kg/cm^2 ]

RAF Bristol Jupiter VI lubrication diagram - MAAS Collection

compression-start temperature at 0 [m] Tic: 365 [°K] (92 [°C])

compression-end temperature at 0 [m] Tc: 538 [°K] (265 [°C])

average engine wall temperature at 0 [m] : 476 [K] (202 [°C])

caloric combustion temperature at 0 [m] Tec: 2169 [°K] (1895 [°C])

polytroph combustion temperature at 0 [m] Tep : 2150 [°K] (1877 [°C])

estimated combustion temperature at 0 [m] Te (T4): 2125 [°K] (1852 [°C])

polytrope expansion-end temperature at 0 [m] Tup: 1167 [°K] (894 [°C])

exhaust stroke end temperature at 0 [m] Tu: 1092 [°K] (819 [°C])

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emergency/take off rating at 1870 [rpm] at sea level : 475 [hp]

Thermal efficiency Nth : 0.341 [ ]

Mechanical efficiency Nm : 0.770 [ ]

Thermo-dynamic efficiency Ntd : 0.263 [ ]

design hours : 1432 [hr] time between overhaul : 28 [hr]

fuel consumption optimum mixture at 1700.00 [rpm] at 0 [m]: 101.75 [kg/hr]

specific fuel consumption thermo-dynamic : 229 [gr/epk] = 307 [gr/kwh]

estimated specific fuel consumption (cruise power) at 0 [m] optimum mixture : 309 [gr/kwh]

estimated sfc (cruise power) at 1450 [m] rich mixture : 309 [gr/kwh]

specific fuel consumption at 0 [m] at 1700 [rpm] with mixture :13.0 :1 : 310 [gr/kwh]

estimated specific oil consumption (cruise power) : 25 [gr/kwh]

Bristol Engine Co: Jupiter - Graces Guide

Literature :

Handbook of aeronautics Volume II Aero-engines page 4

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

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