AIRCRAFT INVESTIGATION
performance calculations for the Hiero E WWI aero engine
Hiero 6 engine built in a Phonix D.I
Hiero E water-cooled 6 -cylinder inline engine 200 [hp](147.1 KW)
introduction : November 1917 country : Austria importance : **
applications : Phonix D.I
general information : was also referred to as Hiero 6. It was designed by Otto
Hieronimus. Ignition : Bosch magnetos
normal rating : 200 [hp](147.1 KW) at 1650 [rpm] at 900 [m] above sea level
high compression engine : cannot run at full power at sea level,
constant power to height : 900 [m]
no reduction, direct drive, valvetrain : overhead-cam
weight engine(s) dry : 329.5 [kg] = 2.24 [kg/KW]
bore : 135.0 [mm] stroke : 180.0 [mm]
Mechanical efficiency/mean pressure correction factor : 0.618 [ ]
invloed hoogte > cm : 0.30 [ ]
compression ratio: 0.00 :1
calculated compression ratio : 5.16 : 1
high compression engine cannot run with full power/throttle at sea-level (only for short period)
published volume (displacement): 15.460 [litre]
calculated stroke volume (Vs) : 15.459 [litre]
compression volume (Vc): 3.717 [litre]
total volume (Vt): 19.176 [litre]
power / stroke volume (litervermogen Nl): 9.5 [kW/litre]
torque : 851 [Nm]
engine weight/volume : 21.3 : [kg/litre]
average piston speed (Cm): 9.9 [m/s]
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intake pressure at 900 [m] altitude Pi : 0.85 [kg/cm2]
mean engine pressure (M.E.P.) at 900 [m] altitude Pm : 5.63 [kg/cm2]
compression pressure at 900 [m] altitude Pc: 7.00 [kg/cm2]
estimated combustion pressure at 900 [m] Pe : 28.01 [kg/cm2]
exhaust pressure at 900 [m] Pu : 3.41 [kg/cm^2 ]
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compression-end temperature at 900 [m] Tc: 590 [°K] (317 [°C])
caloric combustion temperature at 900 [m] Tec: 2236 [°K] (1963 [°C])
Warchalowski Eissler, a tractor company in Vienna, made Hiero engines in WW1
polytroph combustion temperature at 900 [m] Te (T4): 2353 [°K] (2080 [°C])
exhaust temperature at 900 [m] Tu: 1330 [°K] (1056 [°C])
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compression pressure at sea level Pc: 7.63 [kg/cm2]
estimated combustion pressure at sea level Pe : 30.52 [kg/cm^2 ]
compression-end temperature at sea level Tc:592 [°K] (319 [°C])
mean engine pressure at sea level Pm : 6.14 [kg/cm2]
(emergency/Take Off) rating at 1650 [rpm] at sea level : 218 [pk]
Thermal efficiency Nth : 0.336 [ ]
Mechanical efficiency Nm : 0.777 [ ]
Thermo-dynamic efficiency Ntd : 0.261 [ ]
design hours : 802 time between overhaul : 51
fuel consumption optimum mixture at 1650.00 [rpm] at 900 [m]: 54.43 [kg/hr]
specific fuel consumption thermo-dynamic : 242 [gr/epk] = 329 [gr/kwh]
specific fuel consumption (cruise power) at 900 [m] optimum mixture : 340 [gr/kwh]
estimated sfc (cruise power) at 3000 [m] rich mixture : 359 [gr/kwh]
specific fuel consumption at 900 [m] at 1650 [rpm] optimum mixture : 370 [gr/kwh]
estimated specific oil consumption (cruise power) : 24 [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/
content please mail to below mail address
(c) B van der Zalm 29 February 2020 contact : info.aircraftinvestigation@gmail.com python 3.7.4