AIRCRAFT INVESTIGATION
performance calculations for the E.N.V. WWI aero engine
E.N.V. liquid-cooled 8 -cylinder V-engine 30 [hp](22.4 KW)
introduction : May 1909 country : France/United-Kingdom importance : ok
applications : Bleriot XII
normal rating : 30 [hp](22.4 KW) at 1000 [rpm] at 0 [m] above sea level
reduction : 0.7 , valvetrain : side-valves
weight reduction gear : 1.6 [kg]
fuel system : oil system :
weight engine(s) dry without reduction gear : 71.6 [kg] = 3.13 [kg/KW]
bore : 85.0 [mm] stroke : 90.0 [mm]
valve inlet area : 9.2 [cm^2] one inlet and one exhaust valve in cylinder head
gasspeed at inlet valve : 13.0 [m/s]
rich mixture - additional cooling due to vaporizing fuel
throttle : 74 /100 open, mixture :12.5 :1
calculated compression ratio : 4.07 : 1
calculated stroke volume (Vs) : 4.086 [litre]
compression volume (Vc): 1.332 [litre]
total volume (Vt): 5.418 [litre]
engine height : 67 [cm] engine width :65 [cm]
power / stroke volume (litervermogen Nl): 5.5 [kW/litre]
torque : 214 [Nm]
engine weight/volume : 17.1 : [kg/litre]
average piston speed (Cm): 3.0 [m/s]
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intake pressure at 0 [m] altitude Pi : 0.78 [kg/cm2]
mean engine pressure (M.E.P.) at 0 [m] altitude Pm : 5.00 [kg/cm2]
compression pressure at 0 [m] altitude Pc: 4.49 [kg/cm2]
estimated combustion pressure at 0 [m] Pe : 17.03 [kg/cm2]
estimated combustion pressure at 0 [m] Pe : 17.73 [kg/cm2]
exhaust pressure at 0 [m] Pu : 2.91 [kg/cm^2 ]
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compression-start temperature at 0 [m] Tic: 411 [°K] (138 [°C])
compression-end temperature at 0 [m] Tc: 557 [°K] (284 [°C])
average engine wall temperature at 0 [m] : 476 [K] (202 [°C])
caloric combustion temperature at 0 [m] Tec: 1921 [°K] (1648 [°C])
polytroph combustion temperature at 0 [m] Tep : 2114 [°K] (1841 [°C])
estimated combustion temperature at 0 [m] Te (T4): 2001 [°K] (1728 [°C])
polytrope expansion-end temperature at 0 [m] Tup: 1171 [°K] (898 [°C])
exhaust stroke end temperature at 0 [m] Tu: 1062 [°K] (789 [°C])
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emergency/take off rating at 1384 [rpm] at sea level : 40 [hp]
Thermal efficiency Nth : 0.292 [ ]
Mechanical efficiency Nm : 0.640 [ ]
Thermo-dynamic efficiency Ntd : 0.187 [ ]
design hours : 375 [hr] time between overhaul : 21 [hr]
** internal heat transfer (a1): 2859.20 [Kcal/minuut/m2)
required cooling surface : 2.61 [m2]
fuel consumption optimum mixture at 1000.00 [rpm] at 0 [m]: 7.35 [kg/hr]
specific fuel consumption thermo-dynamic : 322 [gr/epk] = 432 [gr/kwh]
estimated specific fuel consumption (cruise power) at 0 [m] optimum mixture : 435 [gr/kwh]
estimated sfc (cruise power) at 325 [m] rich mixture : 438 [gr/kwh]
specific fuel consumption at 0 [m] at 1000 [rpm] with mixture :12.5 :1 : 329 [gr/kwh]
estimated specific oil consumption (cruise power) : 26 [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/
content please mail to below mail address
(c) B van der Zalm 07 October 2020 contact : info.aircraftinvestigation@gmail.com python 3.7.4