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Armstrong Siddeley Puma
liquid-cooled 6 -cylinder inline engine 230 [hp](169.2 KW)
introduction : november 1917 country : United Kingdom
applications : De Havilland DH9
normal rating : 230 [hp](169.2 KW) at 1400 [rpm] at 0 [m] above sea level
no reduction, direct drive
weight engine(s) dry : 308.0 [kg] = 1.82 [kg/KW]
bore : 145.0 [mm] stroke : 190.0 [mm
compression ratio: 4.95 :1
published volume (displacement): 18.800 [litre]
calculated stroke volume (Vs) : 18.825 [litre]
compression volume (Vc): 4.766 [litre]
total volume (Vt): 23.591 [litre]
power / stroke volume ( Nl): 9.0 [kW/litre]
torque : 1154 [Nm]
engine weight/volume : 16.4 : [kg/litre]
average piston speed (Cm): 8.9 [m/s]
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intake pressure at 0 [m] hoogte Pi : 0.95 [kg/cm2]
mean engine pressure (M.E.P.) at 0 [m] hoogte Pm : 5.94 [kg/cm2]
compression pressure at 0 [m] hoogte Pc: 7.40 [kg/cm2]
estimated combustion pressure at 0 [m] Pe : 29.59 [kg/cm^2 ]
exhaust pressure at 0 [m] Pu : 3.80 [kg/cm^2 ]
According to this advertisement rating is 230 hp at 1500 rpm !
compression-end temperature at 0 [m] Tc: 584 [°K] (311 [°C])
caloric combustion temperature at 0 [m] Tec: 2216 [°K] (1942 [°C])
polytrope combustion temperature at 0 [m] Te (T4): 2331 [°K] (2058 [°C])
exhaust temperature at 0 [m] Tu: 1314 [°K] (1041 [°C])
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Thermal efficiency Nth : 0.33 [ ]
Mechanical efficiency Nm : 0.82 [ ]
Thermo-dynamic efficiency Ntd : 0.27 [ ]
design hours : 776 time between overhaul : 61
fuel consumption optimum mixture at1400.00 [rpm] at 0 [m] : 61.70 [kg/hr]
specific fuel consumption thermo-dynamic : 234 [gram/epk] = 318 [gram/kwh]
estimated specific fuel consumption (cruise power) at 0 [m] optimum mixture : 332
[gram/kwh]
specific fuel consumption at 0 [m] at 1400 [rpm] optimum mixture : 364.76
[gram/kwh]
estimated specific oil consumption (cruise power) : 20 [gram/kwh]
literature : wikepedia
Jane’s fighting aircraft WWI
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
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(c) B van der Zalm 30 november 2018 contact : bvanderzalm@ziggo.nl python 3.4.1