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performance calculations for the Clerget 9Z WWI aircraft engine

Clerget 9Z

air-cooled 9 -cylinder two-valve rotary engine 110 [hp](80.9 KW)

introduction : October 1915 country : France importance : **

applications : Nieuport 12A2

normal rating : 110 [hp](80.9 KW) at 1180 [rpm] at 0 [m] above sea level

no reduction, direct drive, valvetrain :

weight engine(s) dry : 166.0 [kg] = 2.05 [kg/KW]

bore : 120.0 [mm] stroke : 150.0 [mm]

Mechanical efficiency/mean pressure correction factor : 0.686 [ ]

invloed hoogte > cm : 0.23 [ ]

compression ratio: 4.00 :1

calculated compression ratio : 4.00 : 1

published volume (displacement): 15.300 [litre]

calculated stroke volume (Vs) : 15.268 [litre]

compression volume (Vc): 5.089 [litre]

total volume (Vt): 20.358 [litre]

power / stroke volume (litervermogen Nl): 5.3 [kW/litre]

torque : 655 [Nm]

engine weight/volume : 11.8 : [kg/litre]

average piston speed (Cm): 5.9 [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 : 4.92 [kg/cm2]

compression pressure at 0 [m] altitude Pc: 5.63 [kg/cm2]

estimated combustion pressure at 0 [m] Pe : 22.51 [kg/cm2]

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

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compression-end temperature at 0 [m] Tc: 547 [°K] (273 [°C])

caloric combustion temperature at 0 [m] Tec: 2080 [°K] (1806 [°C])

polytrope combustion temperature at 0 [m] Te (T4): 2180 [°K] (1907 [°C])

exhaust temperature at 0 [m] Tu: 1278 [°K] (1005 [°C])

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emergency/TO rating can be increased with higher [rpm}

(emergency/take off) rating at 1292 [rpm] at sea level : 120 [pk]

Thermal efficiency Nth : 0.293 [ ]

Mechanical efficiency Nm : 0.691 [ ]

Thermo-dynamic efficiency Ntd : 0.203 [ ]

design hours : 1807 time between overhaul : 201

fuel consumption optimum mixture at 1180.00 [rpm] at 0 [m]: 40.28 [kg/hr]

specific fuel consumption thermo-dynamic : 312 [gr/epk] = 424 [gr/kwh]

specific fuel consumption (cruise power) at 0 [m] optimum mixture : 435 [gr/kwh]

estimated sfc (cruise power) at 2000 [m] rich mixture : 469 [gr/kwh]

specific fuel consumption at 0 [m] at 1180 [rpm] optimum mixture : 498 [gr/kwh]

estimated specific oil consumption (cruise power) : 97 [gr/kwh]

Literature :

https://en.wikipedia.org/wiki/Clerget_aircraft_engines

https://www.valka.cz/Clerget-9Z-t114259

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 13 december 2018 contact : bvanderzalm@ziggo.nl python 3.4.1