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SPAD VII
role : fighter
first flight : April 1916 at Villacoublay operational : September 1916
country : France
design : Louis Béchéreau
production : approx. 5600 aircraft
general information :
The first SPAD S.VII were delivered on 2 September 1916. It was an excellent fighter plane, being fast, stable and strong. Only when flying at low speeds it was difficult to handle. It was put into mass production right away and the airplane served in many allied air forces. Famous pilots who flew the S.VII were : Baracca (Italy), Ruffo, Fonck and Guynemer.
The radiator was placed in the upper wing and could scald the pilot if it was punctured.
users : France, United Kingdom, Belgium, Russia, Italy, United States of America
crew : 1
armament : 1 synchronized 7.70 [mm] (0.303 in) Vickers machine-gun
engine : 1 Hispano Suiza 8Aa liquid-cooled 8 -cylinder V-engine 150 [hp](110.3 KW)
dimensions :
wingspan : 7.82 [m], length : 6.16 [m], height : 2.33[m]
wing area : 17.85 [m^2]
weights :
max.take-off weight : 740 [kg]
empty weight operational : 510 [kg] bombload : 0 [kg]
performance :
maximum speed : 191 [km/u] op 2000 [m]
climbing speed : 255 [m/min]
service ceiling : 5334 [m]
endurance : 2.25 [hours]
estimated action radius : 193 [km]
description :
2-bay biplane with fixed landing gear and tail strut
two spar upper and lower wing
engines, landing gear, fuel and bombs in or attached to the fuselage
airscrew :
fixed pitch 2 -bladed tractor airscrew with max. efficiency :0.63 [ ]
estimated diameter airscrew 2.44 [m]
angle of attack prop : 20.26 [ ]
reduction : 1.00 [ ]
airscrew revs : 1500 [r.p.m.]
pitch at Max speed 2.12 [m]
blade-tip speed at Vmax and max revs. : 199 [m/s]
calculation : *1* (dimensions)
mean wing chord : 1.14 [m]
calculated wing chord (rounded tips): 1.30 [m]
wing aspect ratio : 6.85 []
estimated gap : 0.96 [m]
gap/chord : 0.84 [ ]
seize (span*length*height) : 112 [m^3]
calculation : *2* (fuel consumption)
oil consumption : 1.7 [kg/hr]
fuel consumption(cruise speed) : 25.3 [kg/hr] (34.5 [litre/hr]) at 63 [%] power
distance flown for 1 kg fuel : 6.79 [km/kg]
estimated total fuel capacity : 88 [litre] (65 [kg])
calculation : *3* (weight)
weight engine(s) dry : 215.0 [kg] = 1.95 [kg/KW]
weight 8 litre oil tank : 0.7 [kg]
oil tank filled with 0.8 litre oil : 0.7 [kg]
oil in engine 6 litre oil : 5.5 [kg]
fuel in engine 1 litre fuel : 0.6 [kg]
weight 15 litre gravity patrol tank(s) : 2.2 [kg]
Original SPAD VII at the Musee de l’air et de l’espace, once flown by Georges Guynemer
weight radiator : 15.8 [kg]
weight exhaust pipes & fuel lines 12.7 [kg]
weight cowling 4.4 [kg]
weight airscrew(s) (wood) incl. boss & bolts : 19.0 [kg]
total weight propulsion system : 276 [kg](37.3 [%])
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fuselage skeleton (wood gauge : 5.21 [cm]): 43 [kg]
bracing : 1.9 [kg]
fuselage covering ( 7.2 [m2] doped linen fabric) : 2.3 [kg]
weight controls + indicators: 5.2 [kg]
weight seats : 3.0 [kg]
weight other details, lighting set, etc. : 5.1 [kg]
weight 74 [litre] main fuel tank empty : 5.9 [kg]
weight engine mounts & firewalls : 6 [kg]
total weight fuselage : 72 [kg](9.7 [%])
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weight wing covering (doped linen fabric) : 11 [kg]
total weight ribs (53 ribs) : 44 [kg]
load on front upper spar (clmax) per running metre : 705.0 [N]
load on rear upper spar (vmax) per running metre : 280.5 [N]
total weight 8 spars : 25 [kg]
weight wings : 80 [kg]
weight wing/square meter : 4.49 [kg]
weight 8 interplane struts & cabane : 3.3 [kg]
SPAD VII No.19 sq. RFC Lt Allabarton
weight cables (45 [m]) : 1.8 [kg] (= 39 [gram] per metre)
diameter cable : 2.5 [mm]
weight fin & rudder (0.7 [m2]) : 3.3 [kg]
weight stabilizer & elevator (2.0 [m2]): 9.1 [kg]
total weight wing surfaces & bracing : 98 [kg] (13.2 [%])
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weight machine-gun(s) : 15.9 [kg]
weight ammunition magazine(s) :1.8 [kg]
weight synchronizing system : 1.0 [kg]
weight armament : 19 [kg]
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wheel pressure : 370.0 [kg]
weight 2 wheels (680 [mm] by 80 [mm]) : 17.4 [kg]
weight tailskid : 1.6 [kg]
weight undercarriage with axle 13.2 [kg]
total weight landing gear : 32.3 [kg] (4.4 [%]
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calculated empty weight : 496 [kg](67.0 [%])
weight oil for 2.7 hours flying : 4.5 [kg]
weight cooling fluids : 23.8 [kg]
weight ammunition (400 rounds) : 13.6 [kg]
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calculated operational weight empty : 538 [kg] (72.7 [%])
published operational weight empty : 510 [kg] (68.9 [%])
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weight crew : 81 [kg]
weight fuel for 1.5 hours flying : 38 [kg]
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operational weight : 657 [kg](88.8 [%])
estimated bomb load : 25 [kg]
operational weight bombing mission : 682 [kg]
fuel reserve : 27 [kg] enough for 1.05 [hours] flying
possible additional useful load : 31 [kg]
operational weight fully loaded : 740 [kg] with fuel tank filled for 100 [%]
published maximum take-off weight : 740 [kg] (100.0 [%])
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calculation : * 4 * (engine power)
power loading (operational without bombload) : 5.96 [kg/kW]
total power : 110.3 [kW] at 1500 [r.p.m]
calculation : *5* (loads)
manoeuvre load : 3.2 [g] at 1000 [m]
limit load : 4.5 [g] ultimate load : 6.8 [g] load factor : 1.9 [g]
design flight time : 1.80 [hours]
design cycles : 222 sorties, design hours : 400 [hours]
operational wing loading : 361 [N/m^2]
Major Baracca posing for his Italian SPAD VII
wing stress (3 g) during operation : 241 [N/kg] at 3g emergency manoeuvre
calculation : *6* (angles of attack)
angle of attack zero lift : -1.22 ["]
max. angle of attack (stalling angle) : 12.70 ["]
angle of attack at max.speed : 1.88 ["]
calculation : *7* (lift & drag ratios
lift coefficient at angle of attack 0° :0.10 [ ]
lift coefficient at max. angle of attack : 1.14 [ ]
lift coefficient at max. speed : 0.25 [ ]
induced drag coefficient at max. speed : 0.0054 [ ]
drag coefficient at max.speed : 0.0398 [ ]
drag coefficient (zero lift) : 0.0344 [ ]
calculation : *8* (speeds
stalling speed at sea-level (OW): 82 [km/u]
landing speed at sea-level (OW without bombload): 98 [km/hr]
min. drag speed (max endurance) : 124 [km/hr] at 2667 [m](power :38 [%])
min. power speed (max range) : 133 [km/hr] at 2667 [m] (power:40 [%])
max. rate of climb speed : 119.6 [km/hr] at sea-level
cruising speed : 172 [km/hr] op 2667 [m] (power:58 [%])
design speed prop : 185 [km/hr]
maximum speed : 191 [km/hr] op 2000 [m] (power:77 [%])
climbing speed at sea-level (without bombload) : 351 [m/min]
calculation : *9* (regarding various performances)
take-off distance at sea-level : 193 [m]
lift/drag ratio : 9.37 [ ]
max. practical ceiling : 5700 [m] with flying weight :618 [kg]
practical ceiling (operational weight): 5350 [m] with flying weight :657 [kg]
practical ceiling fully loaded (mtow- 1 hour fuel) : 4850 [m] with flying weight :715 [kg]
published ceiling (5334 [m]
climb to 1500m (without bombload) : 4.75 [min]
climb to 3000m (without bombload) : 11.56 [min]
max. dive speed : 436.0 [km/hr] at 3850 [m] height
load factor at max. angle turn 2.13 ["g"]
turn radius at 500m: 62 [m]
time needed for 360* turn 11.6 [seconds] at 500m
calculation *10* (action radius & endurance)
operational endurance : 2.55 [hours] with 1 crew and 56 [kg] useful (bomb)load and 100.0 [%] fuel
published endurance : 2.25 [hours] with 1 crew and possible useful (bomb) load : 64 [kg] and 88.1 [%] fuel
action radius : 343 [km] with 1 crew and 20[kg] photo camera/radio transmitter or bombload
max range theoretically with additional fuel tanks for total 184 [litre] fuel : 914 [km]
useful load with action-radius 250km : 61 [kg]
production : 10.47 [tonkm/hour]
oil and fuel consumption per tonkm : 2.58 [kg]
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Literature :
praktisch handboek vliegtuigen I page 146,147
Jane's FAWOI page 122,123
Jagdflugzeuge WO I page 34
Warplanes WOI page 55f,58t,59,94,95
Fighters 1914-19 page 46
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 04 January 2019 contact : info.aircraftinvestigation@gmail.com python 3.7.4