Maybach Mb.III | aircraft investigation

AIRCRAFT PERFORMANCE AND WEIGHT INVESTIGATION >>>> HOME PAGE

performance calculations for the Maybach Mb.III WWI aero engine

Maybach Mb III

Maybach Mb.III on display in the Polish Aviation museum

Maybach Mb.III liquid-cooled 6 -cylinder inline engine 160 [hp](117.7 KW)

introduction : November 1916 country : Germany importance : **

applications : Hansa Brandenburg KDW

normal rating : 160 [hp](117.7 KW) at 1400 [rpm] at 0 [m] above sea level

no reduction, direct drive, valvetrain :

weight engine(s) dry : 282.4 [kg] = 2.40 [kg/KW]

calculated bore : 139.5 [mm] calculated stroke : 174.4 [mm]

Mechanical efficiency/mean pressure correction factor : 0.650 [ ]

invloed hoogte > cm : 0.30 [ ]

compression ratio: 0.00 :1

calculated compression ratio : 4.37 : 1

published volume (displacement): 16.000 [litre]

calculated stroke volume (Vs) : 16.000 [litre]

compression volume (Vc): 4.744 [litre]

total volume (Vt): 20.744 [litre]

power / stroke volume (litervermogen Nl): 7.4 [kW/litre]

torque : 803 [Nm]

engine weight/volume : 17.7 : [kg/litre]

average piston speed (Cm): 8.1 [m/s]

***************************************************************************

intake pressure at 0 [m] altitude Pi : 0.95 [kg/cm2]

mean engine pressure (M.E.P.) at 0 [m] altitude Pm : 5.38 [kg/cm2]

compression pressure at 0 [m] altitude Pc: 6.31 [kg/cm2]

estimated combustion pressure at 0 [m] Pe : 25.24 [kg/cm2]

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

**************************************************************************

compression-end temperature at 0 [m] Tc: 569 [°K] (295 [°C])

caloric combustion temperature at 0 [m] Tec: 2144 [°K] (1871 [°C])

polytroph combustion temperature at 0 [m] Te (T4): 2268 [°K] (1995 [°C])

exhaust temperature at 0 [m] Tu: 1333 [°K] (1060 [°C])

*********************************************************************************

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

(emergency/take off) rating at 1533 [rpm] at sea level : 175 [pk]

Thermal efficiency Nth : 0.308 [ ]

Mechanical efficiency Nm : 0.741 [ ]

Thermo-dynamic efficiency Ntd : 0.229 [ ]

design hours : 1097 time between overhaul : 85

fuel consumption optimum mixture at 1400.00 [rpm] at 0 [m]: 52.31 [kg/hr]

specific fuel consumption thermo-dynamic : 276 [gr/epk] = 376 [gr/kwh]

specific fuel consumption (cruise power) at 0 [m] optimum mixture : 390 [gr/kwh]

estimated sfc (cruise power) at 2000 [m] rich mixture : 410 [gr/kwh]

specific fuel consumption at 0 [m] at 1400 [rpm] optimum mixture : 444 [gr/kwh]

estimated specific oil consumption (cruise power) : 22 [gr/kwh]

Literature :

http://www.muzeumlotnictwa.pl/zbiory_sz.php?ido=304&w=a

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