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performance calculations for the Nieuport flat twin aero engine

Nieuport flat twin air-cooled horizontally opposed two-cylinder piston engine 28 [hp] (20.9 KW)

introduction : May 1911 country : France importance : **

applications : Nieuport IIN

normal rating : 28 [hp](20.9 KW) at 1300 [rpm] at 0 [m] above sea level

no reduction, direct drive, valvetrain : SOHC

fuel system : oil system :

weight engine(s) dry : 75.2 [kg] = 3.60 [kg/KW]

bore : 135.0 [mm] stroke : 130.0 [mm]

valve inlet area : 23.3 [cm^2] one inlet and one exhaust valve in cylinder head

gasspeed at inlet valve : 24.4 [m/s]

optimum mixture

throttle : 91 /100 open, mixture :13.0 :1

calculated compression ratio : 3.89 : 1

calculated stroke volume (Vs) : 3.722 [litre]

compression volume (Vc): 1.289 [litre]

total volume (Vt): 5.010 [litre]

power / stroke volume (litervermogen Nl): 5.6 [kW/litre]

torque : 153 [Nm]

engine weight/volume : 20.2 : [kg/litre]

average piston speed (Cm): 5.6 [m/s]

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intake pressure at 0 [m] altitude Pi : 0.97 [kg/cm2]

mean engine pressure (M.E.P.) at 0 [m] altitude Pm : 4.63 [kg/cm2]

compression pressure at 0 [m] altitude Pc: 5.28 [kg/cm2]

estimated combustion pressure at 0 [m] Pe : 21.09 [kg/cm2]

estimated combustion pressure at 0 [m] Pe : 22.05 [kg/cm2]

exhaust pressure at 0 [m] Pu : 3.81 [kg/cm^2 ]

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compression-start temperature at 0 [m] Tic: 386 [°K] (113 [°C])

compression-end temperature at 0 [m] Tc: 525 [°K] (252 [°C])

average engine wall temperature at 0 [m] : 476 [K] (202 [°C])

caloric combustion temperature at 0 [m] Tec: 2083 [°K] (1810 [°C])

Nieuport IIN with 28 hp flat twin engine preserved in the Musee de l ‘air in Paris (Le Bourget)

polytroph combustion temperature at 0 [m] Tep : 2099 [°K] (1826 [°C])

estimated combustion temperature at 0 [m] Te (T4): 2066 [°K] (1793 [°C])

polytrope expansion-end temperature at 0 [m] Tup: 1231 [°K] (958 [°C])

exhaust stroke end temperature at 0 [m] Tu: 1152 [°K] (879 [°C])

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emergency/take off rating at 1463 [rpm] at sea level : 32 [hp]

Thermal efficiency Nth : 0.288 [ ]

Mechanical efficiency Nm : 0.706 [ ]

Thermo-dynamic efficiency Ntd : 0.203 [ ]

design hours : 226 [hr] time between overhaul : 8 [hr]

afgevoerde warmte via koellucht per minuut per m2 : 706.74 [Kcal/minuut/m2]

required cooling surface : 1.62 [m2]

weight cooling ribs : 12.24 [kg]

fuel consumption optimum mixture at 1300.00 [rpm] at 0 [m]: 10.12 [kg/hr]

specific fuel consumption thermo-dynamic : 296 [gr/epk] = 397 [gr/kwh]

estimated specific fuel consumption (cruise power) at 0 [m] optimum mixture : 425 [gr/kwh]

estimated sfc (cruise power) at 325 [m] rich mixture : 428 [gr/kwh]

specific fuel consumption at 0 [m] at 1300 [rpm] with mixture :13.0 :1 : 485 [gr/kwh]

estimated specific oil consumption (cruise power) : 40 [gr/kwh]

Literature :

Jane’s record breaking aircraft page 25

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 07 October 2020 contact : info.aircraftinvestigation@gmail.com python 3.7.4