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Curtiss OX-5
liquid-cooled 8 -cylinder V-engine 90 [hp](66.2 KW)
introduction : march 1917 country : USA
applications : Curtiss JN-4 “Jenny”
valvetrain : 1+1
normal rating : 90 [hp] (66.2 KW) at 1400 [rpm] at 0 [m] above sea level
no reduction, direct drive
weight engine(s) dry : 177.0 [kg] = 2.67 [kg/KW]
bore : 101.6 [mm] stroke : 127.0 [mm]
compression ratio: 4.90 :1
published volume (displacement): 8.244 [litre]
calculated stroke volume (Vs) : 8.237 [litre]
compression volume (Vc): 2.112 [litre]
total volume (Vt): 10.349 [litre]
power / stroke volume (litervermogen Nl): 8.0 [kW/litre]
torque : 452 [Nm]
engine weight/volume : 21.5 : [kg/litre]
average piston speed (Cm): 5.9 [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 : 6.03 [kg/cm2]
compression pressure at 0 [m] hoogte Pc: 7.30 [kg/cm2]
estimated combustion pressure at 0 [m] Pe : 29.21 [kg/cm2]
exhaust pressure at 0 [m] Pu : 3.80 [kg/cm^2 ]
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compression-end temperature at 0 [m] Tc: 589 [°K] (315 [°C])
caloric combustion temperature at 0 [m] Tec: 2214 [°K] (1941 [°C])
polytrope combustion temperature at 0 [m] Te (T4): 2349 [°K] (2076 [°C])
exhaust temperature at 0 [m] Tu: 1350 [°K] (1077 [°C])
Thermal efficiency Nth : 0.33 [ ]
Mechanical efficiency Nm : 0.72 [ ]
Thermo-dynamic efficiency Ntd : 0.24 [ ]
design hours : 1529 time between overhaul : 160
fuel consumption optimum mixture at1400.00 [rpm] at 0 [m] : 26.52 [kg/hr]
specific fuel consumption thermo-dynamic : 267 [gr/epk] = 363 [gr/kwh]
specific fuel consumption (cruise power) at 0 [m] optimum mixture : 368 [gr/kwh]
specific fuel consumption at 0 [m] at 1400 [rpm] optimum mixture : 401 [gr/kwh]
estimated specific oil consumption (cruise power) : 26 [gr/kwh]
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/photograps/content please mail to below mail address
(c) B van der Zalm 13 december 2018 contact : bvanderzalm@ziggo.nl python 3.4.1