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aero engine performance calculations
Benz Bz.IVu
liquid-cooled 6 -cylinder inline engine 220 [hp](161.8 KW)
introduction : May 1918 country : Germany importance : ***
applications : LVG C.VI
normal rating : 220 [hp](161.8 KW) at 1450 [rpm] at 1300 [m] above sea level
high compression engine : cannot run at full power at sea level,
constant power to height : 1300 [m]
no reduction, direct drive, valvetrain :
weight engine(s) dry : 370.0 [kg] = 2.29 [kg/KW]
bore : 145.0 [mm] stroke : 190.0 [mm]
Mechanical efficiency/mean pressure correction factor : 0.604 [ ]
invloed hoogte > cm : 0.21 [ ]
compression ratio: 0.00 :1
calculated compression ratio : 5.31 : 1
high compression engine cannot run with full power/throttle at sea-level (only for short period)
published volume (displacement): 18.825 [litre]
calculated stroke volume (Vs) : 18.825 [litre]
compression volume (Vc): 4.368 [litre]
total volume (Vt): 23.193 [litre]
power / stroke volume (litervermogen Nl): 8.6 [kW/litre]
torque : 1066 [Nm]
engine weight/volume : 19.7 : [kg/litre]
average piston speed (Cm): 9.2 [m/s]
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intake pressure at 1300 [m] altitude Pi : 0.81 [kg/cm2]
mean engine pressure (M.E.P.) at 1300 [m] altitude Pm : 5.62 [kg/cm2]
compression pressure at 1300 [m] altitude Pc: 6.92 [kg/cm2]
estimated combustion pressure at 1300 [m] Pe : 27.68 [kg/cm2]
exhaust pressure at 1300 [m] Pu : 3.25 [kg/cm^2 ]
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compression-end temperature at 1300 [m] Tc: 589 [°K] (316 [°C])
caloric combustion temperature at 1300 [m] Tec: 2248 [°K] (1975 [°C])
polytroph combustion temperature at 1300 [m] Te (T4): 2352 [°K] (2079 [°C])
exhaust temperature at 1300 [m] Tu: 1310 [°K] (1037 [°C])
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compression pressure at sea level Pc: 7.92 [kg/cm2]
estimated combustion pressure at sea level Pe : 31.67 [kg/cm^2 ]
compression-end temperature at sea level Tc:596 [°K] (323 [°C])
mean engine pressure at sea level Pm : 6.43 [kg/cm2]
emergency/TO rating can be increased with higher [rpm}
(emergency/take off) rating at 1588 [rpm] at sea level : 276 [pk]
Thermal efficiency Nth : 0.341 [ ]
Mechanical efficiency Nm : 0.800 [ ]
Thermo-dynamic efficiency Ntd : 0.273 [ ]
design hours : 919 time between overhaul : 64
fuel consumption optimum mixture at 1450.00 [rpm] at 1300 [m]: 56.44 [kg/hr]
specific fuel consumption thermo-dynamic : 231 [gr/epk] = 315 [gr/kwh]
specific fuel consumption (cruise power) at 1300 [m] optimum mixture : 325 [gr/kwh]
estimated sfc (cruise power) at 3254 [m] rich mixture : 339 [gr/kwh]
specific fuel consumption at 1300 [m] at 1450 [rpm] optimum mixture : 349 [gr/kwh]
estimated specific oil consumption (cruise power) : 13 [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 03 November 2019 contact : info.aircraftinvestigation@gmail.com python 3.7.4