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performance calculations for the Hispano Suiza 8Be WWI aero engine
Engine of the SPAD S.XIII flown by Roland Garros, Musee de l’air and espace, Le Bourget, Paris.
Hispano Suiza 8Be liquid-cooled 8 -cylinder V-engine 220 [hp](164.1 KW)
introduction : May 1917 country : Spain importance : ****
applications : SPAD S.XIII
normal rating : 220 [hp](164.1 KW) at 2300 [rpm] at 0 [m] above sea level
reduction : 0.75 , valvetrain : SOHC
engine height : 89 [cm] engine width :86 [cm] length : 136 [cm]
weight reduction gear : 12.2 [kg]
fuel system : oil system :
weight engine(s) dry without reduction gear : 236.0 [kg] = 1.44 [kg/KW]
bore : 120.0 [mm] stroke : 130.0 [mm]
valve inlet area : 22.0 [cm^2] one inlet and one exhaust valve in cylinder head
gasspeed at inlet valve : 36.1 [m/s]
throttle : 94 /100 open, mixture :13.0 :1
compression ratio: 5.30 :1
stroke volume (Vs) : 11.762 [litre]
compression volume (Vc): 2.735 [litre]
total volume (Vt): 14.498 [litre]
power / stroke volume (litervermogen Nl): 14.0 [kW/litre]
torque : 681 [Nm]
engine weight/volume : 20.1 : [kg/litre]
average piston speed (Cm): 10.0 [m/s]
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intake pressure at 0 [m] altitude Pi : 0.91 [kg/cm2]
mean engine pressure (M.E.P.) at 0 [m] altitude Pm : 6.52 [kg/cm2]
compression pressure at 0 [m] altitude Pc: 7.28 [kg/cm2]
estimated combustion pressure at 0 [m] Pe : 29.14 [kg/cm2]
exhaust pressure at 0 [m] Pu : 3.56 [kg/cm^2 ]
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compression-start temperature at 0 [m] Tic: 348 [°K] (75 [°C])
compression-end temperature at 0 [m] Tc: 519 [°K] (246 [°C])
caloric combustion temperature at 0 [m] Tec: 2106 [°K] (1833 [°C])
polytroph combustion temperature at 0 [m] Tep : 2077 [°K] (1804 [°C])
estimated combustion temperature at 0 [m] Te (T4): 2069 [°K] (1796 [°C])
polytrope exhaust temperature at 0 [m] Tup: 1341 [°K] (1068 [°C])
exhaust end temperature at 0 [m] Tu: 1259 [°K] (986 [°C])
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emergency/take off rating is equal to max.continuous rating : 220 [hp](164.1 KW)
Thermal efficiency Nth : 0.341 [ ]
Mechanical efficiency Nm : 0.727 [ ]
Thermo-dynamic efficiency Ntd : 0.248 [ ]
design hours : 553 time between overhaul : 35
fuel consumption optimum mixture at 2300.00 [rpm] at 0 [m]: 57.31 [kg/hr]
specific fuel consumption thermo-dynamic : 242 [gr/epk] = 325 [gr/kwh]
estimated specific fuel consumption (cruise power) at 0 [m] optimum mixture : 335 [gr/kwh]
estimated sfc (cruise power) at 3325 [m] rich mixture : 342 [gr/kwh]
specific fuel consumption at 0 [m] at 2300 [rpm] with mixture :13.0 :1 : 349 [gr/kwh]
estimated specific oil consumption (cruise power) : 14 [gr/kwh]
Literature :
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/
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(c) B van der Zalm 31 May 2020 contact : info.aircraftinvestigation@gmail.com python 3.7.4