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performance calculations for the De Haviland Gipsy Queen 70-3 aircraft engine

Gipsy Queen 70-4 engine on display at the RAF museum Cosford

De Haviland Gipsy Queen 70-3 air-cooled 6 -cylinder inverted inline engine 285

[hp] (212.5 KW)

gear-driven supercharger, constant power to height : 2135 [m] blower ratio : 11.22 [:1]

introduction : 1946 country : UK importance : ***

applications : De Havilland D.H.104 Dove srs.1

normal rating : 285 [hp](212.5 KW) at 2600 [rpm] at 2135 [m] above sea level

take-off power : 330 [hp] (246.1 [KW]) at 2800 [rpm]

reduction : 0.711 , valvetrain : OHV

weight engine(s) dry with reduction gear : 300.0 [kg] = 1.41 [kg/KW]

General information :

fuel system : fuel type : octane grade no. 87 oil system :

engine starter type :

bore : 118.0 [mm] stroke : 140.0 [mm]

supercharger compression ratio : 1.45 [ ]

valve inlet area : 21.3 [cm^2] one inlet and one exhaust valve in cylinder head

gasspeed at inlet valve : 43.9 [m/s]

blower speed : 29172 [rpm] , mixture :13.0 :1

compression ratio: 6.50 :1

stroke volume (Vs displacement): 9.186 [litre]

compression volume (Vc): 1.670 [litre]

total volume (Vt): 10.856 [litre]

calculated engine height : 81 [cm]

calculated engine length: 1.58 [m]

specific power : 23.1 [kW/litre]

torque : 781 [Nm]

engine weight/volume : 32.7 : [kg/litre]

average piston speed (Cm): 12.1 [m/s]

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intake manifold absolute pressure (MAP) at 2135 [m] altitude Pi (ata.) : 1.03 [kg/cm2]

(29.83 [inHg])

mean engine pressure (M.E.P.) at 2135 [m] altitude Pm : 9.22 [kg/cm2]

compression pressure at 2135 [m] altitude Pc: 10.69 [kg/cm2]

estimated combustion pressure at 2135 [m] Pe : 42.70 [kg/cm2]

exhaust pressure at 2135 [m] Pu : 4.04 [kg/cm^2 ]

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compression-start temperature at 2135 [m] Tic: 338 [°K] (65 [°C])

compression-end temperature at 2135 [m] Tc: 534 [°K] (261 [°C])

average engine wall temperature at 2135 [m] : 476 [K] (202 [°C])

caloric combustion temperature at 2135 [m] Tec: 2287 [°K] (2014 [°C])

polytroph combustion temperature at 2135 [m] Tep : 2132 [°K] (1859 [°C])

estimated combustion temperature at 2135 [m] Te (T4): 2192 [°K] (1919 [°C])

polytrope expansion-end temperature at 2135 [m] Tup: 1152 [°K] (879 [°C])

exhaust stroke end temperature at 2135 [m] Tu: 1121 [°K] (848 [°C])

*********************************************************************************

calculations for take-off/emergency power at sea level

average piston speed : 13.1 [m/s]

gasspeed at inlet valve : 47.3 [m/s]

intake pressure at sea level for Take-off Pi : 1.16 [kg/cm2] (33.45 [inHg])

max. intake pressure (full blower) at sea level for Take-off Pi : 1.50 [kg/cm2]

(43.35 [inHg])

rich mixture 11.5 : 1 applied for cooling > carburettor adjustable in flight by the pilot

caloric combustion temperature at sea level Tec: 2106 [°K] (1833 [°C])

emergency/take off rating at 2800 [rpm] at sea level : 330 [hp]

Thermal efficiency Nth : 0.374 [ ]

Mechanical efficiency Nm : 0.722 [ ]

Thermo-dynamic efficiency Ntd : 0.270 [ ]

design hours : 4489 [hr] time between overhaul : 3241 [hr]

dispersed engine heat by cooling air : 4816.29 [Kcal/minuut/m2]

required cooling surface : 4.40 [m2]

weight cooling ribs : 11.38 [kg]

fuel consumption optimum mixture at 2600.00 [rpm] at 2135 [m]: 73.23 [kg/hr]

specific fuel consumption thermo-dynamic : 223 [gr/epk] = 299 [gr/kwh]

estimated specific fuel consumption (cruise power) at 2135 [m] : 307 [gr/kwh]

specific fuel consumption (volume*rpm at 1 atm MAP) at 2600 [rpm] : 318 [gr/kwh]

estimated specific oil consumption (cruise power) : 14 [gr/kwh]

Literature :

Jane’s fighting aircraft WWII page 276

de Havilland Gipsy Queen - Wikipedia

Aero engines page 54

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 03 April 2022 contact : info.aircraftinvestigation@gmail.com python 3.7.4

notes :