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performance calculations for the BMW 132A-3 aircraft engine
BMW 132A-3 air-cooled 9 -cylinder radial engine 690 [hp](514.5 KW)
Single-speed centrifugal-type supercharger
German engine rating : 699.6 [PS]
introduction : May 1932 country : Germany importance : ***
applications : Junkers Ju 52/3mce
normal rating : 690 [hp](514.5 KW) at 2250 [rpm] at 500 [m] above sea level
reduction : 0.62 , valvetrain : Two overhead valves per cylinder
weight reduction gear : 20.6 [kg]
fuel system : oil system :
weight engine(s) dry without reduction gear : 524.6 [kg] = 0.98 [kg/KW]
bore : 155.6 [mm] stroke : 161.9 [mm]
valve inlet area : 37.0 [cm^2] one inlet and one exhaust valve in cylinder head
gas speed at inlet valve : 43.9 [m/s]
throttle : 89 /100 open, mixture :13.0 :1
compression ratio: 6.50 :1
stroke volume (displacement): 27.700 [litre]
compression volume (Vc): 5.038 [litre]
total volume (Vt): 32.745 [litre]
diam. engine : 138 [cm]
engine length: 141 [cm]
specific power : 18.6 [kW/litre]
torque : 2184 [Nm]
engine weight/volume : 18.2 : [kg/litre]
average piston speed (Cm): 12.1 [m/s]
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intake pressure at 500 [m] altitude Pi : 0.95 [kg/cm2]
mean engine pressure (M.E.P.) at 500 [m] altitude Pm : 7.99 [kg/cm2]
compression pressure at 500 [m] altitude Pc: 9.86 [kg/cm2]
estimated combustion pressure at 500 [m] Pe : 39.39 [kg/cm2]
exhaust pressure at 500 [m] Pu : 3.72 [kg/cm^2 ]
BMW 132 A aircraft engine serial number 66074 in the Aviation Museum of Central Finland. Recovered from Junkers Ju 52 7U+OM of 4./TGr.20 which was shot down in October 1944.
compression-start temperature at 500 [m] Tic: 346 [°K] (73 [°C])
compression-end temperature at 500 [m] Tc: 544 [°K] (270 [°C])
average engine wall temperature at 500 [m] : 476 [K] (202 [°C])
caloric combustion temperature at 500 [m] Tec: 2171 [°K] (1898 [°C])
polytroph combustion temperature at 500 [m] Tep : 2171 [°K] (1898 [°C])
estimated combustion temperature at 500 [m] Te (T4): 2141 [°K] (1868 [°C])
polytrope expansion-end temperature at 500 [m] Tup: 1121 [°K] (848 [°C])
exhaust stroke end temperature at 500 [m] Tu: 1075 [°K] (802 [°C])
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calculations for take-off/emergency power at sea level
intake pressure at sea level Pi : 0.95 [kg/cm2]
rich mixture 9 : 1 applied for cooling > carburettor adjustable in flight by the pilot
compression-end temperature at sea level max rpm Tc:510 [°K] (237 [°C])
polytrope combustion temperature at sea level Tec: 1936 [°K] (1663 [°C])
caloric combustion temperature at sea level Tec: 1521 [°K] (1247 [°C])
emergency/take off rating at 2503 [rpm] at sea level : 695 [hp]
Thermal efficiency Nth : 0.374 [ ]
Mechanical efficiency Nm : 0.765 [ ]
Thermo-dynamic efficiency Ntd : 0.286 [ ]
design hours : 1020 [hr] time between overhaul : 24 [hr]
dispersed engine heat by cooling air : 7561.03 [Kcal/minute/m2]
required cooling surface : 23.97 [m2]
weight cooling ribs : 66.82 [kg]
fuel consumption optimum mixture at 2250.00 [rpm] at 500 [m]: 150.55 [kg/hr]
specific fuel consumption thermo-dynamic : 210 [gr/epk] = 282 [gr/kwh]
estimated specific fuel consumption (cruise power) at 500 [m] optimum mixture : 300 [gr/kwh]
estimated sfc (cruise power) at 2600 [m] rich mixture : 304 [gr/kwh]
specific fuel consumption at 500 [m] at 2250 [rpm] with mixture :13.0 :1 : 293 [gr/kwh]
estimated specific oil consumption (cruise power) : 16 [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 18 September 2021 contact : info.aircraftinvestigation@gmail.com python 3.7.4