Bristol F.2B
role : multi role combat aircraft
first flight : operational : December 1917
country : United-Kingdom
design :
production : 3101 aircraft
general information :
important aircraft WOI . One of the best fighting planes of WWI. More powerful version, modified lower wing section and wider span tail planes. Improved view from front cockpit.
Gap : 1.65m chord : 1.67m total area of tail : 2.06m2 area of elevators : 2.16m2 area of rudder : 0.67m2 area of fin : 0.99m2 airscrew : 2.94m pitch : 2.84m Petrol tank capacity : 45 gallon = 205 litre, endurance : 3 hrs oil capacity : 4 gallon = 18.2 litre Max.speed : 201 km/u op sea level landing speed : 77 km/u climb to 3048m : 11.5 minutes
users : RFC
crew : 2
armament : 1 synchronized 7.70 [mm] (0.303 in) Vickers machine-gun
and 1 movable 7.70 [mm] (0.303 in) Lewis machine-gun for the observer
engine : 1 Rolls Royce Falcon III liquid-cooled 12 -cylinder V-engine 275 [hp](202.3 KW)
dimensions :
wingspan : 11.96 [m], length : 7.87 [m], height : 2.97[m]
wing area : 37.68 [m^2]
weights :
max.take-off weight : 1474 [kg]
empty weight operational : 975 [kg] bombload : 108 [kg]
performance :
maximum speed : 198 [km/u] op 1500 [m]
climbing speed : 271 [m/min]
service ceiling : 6553 [m]
endurance : 3.09 [hours]
estimated action radius : 275 [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 4 -bladed tractor airscrew with max. efficiency :0.60 [ ]
diameter airscrew 2.94 [m]
angle of attack prop : 19.74 [ ]
reduction : 0.59 [ ]
airscrew revs : 1328 [r.p.m.]
pitch at Max speed 2.49 [m]
blade-tip speed at Vmax and max revs. : 212 [m/s]
calculation : *1* (dimensions)
mean wing chord : 1.58 [m]
calculated wing chord (rounded tips): 1.74 [m]
wing aspect ratio : 7.59 []
gap : 1.65 [m]
gap/chord : 1.05 [ ]
seize (span*length*height) : 280 [m^3]
calculation : *2* (fuel consumption)
oil consumption : 3.0 [kg/hr]
fuel consumption(cruise speed) : 42.8 [kg/hr] (58.4 [litre/hr]) at 59 [%] power
distance flown for 1 kg fuel : 4.16 [km/kg]
estimated total fuel capacity : 205 [litre] (150 [kg])
calculation : *3* (weight)
weight engine(s) dry : 286.0 [kg] = 1.41 [kg/KW]
weight reduction gear : 24.3 [kg]
weight 18 litre oil tank : 1.5 [kg]
oil tank filled with 1.5 litre oil : 1.4 [kg]
oil in engine 11 litre oil : 10.1 [kg]
fuel in engine 1 litre fuel : 1.0 [kg]
weight 25 litre gravity patrol tank(s) : 3.7 [kg]
weight radiator : 32.4 [kg]
weight exhaust pipes & fuel lines 23.6 [kg]
weight self-starter : 5.0 [kg]
weight cowling 8.1 [kg]
weight airscrew(s) (wood) incl. boss & bolts : 38.4 [kg]
total weight propulsion system : 458 [kg](31.1 [%])
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fuselage skeleton (wood gauge : 6.82 [cm]): 94 [kg]
bracing : 5.2 [kg]
fuselage covering ( 11.7 [m2] doped linen fabric) : 3.7 [kg]
weight controls + indicators: 6.2 [kg]
weight seats : 6.0 [kg]
weight other details, lighting set, etc. : 5.1 [kg]
weight bomb storage : 7.6 [kg]
weight bomb sight : 1.0 [kg]
weight 180 [litre] main fuel tank empty : 14.4 [kg]
weight engine mounts & firewalls : 10 [kg]
total weight fuselage : 153 [kg](10.4 [%])
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weight wing covering (doped linen fabric) : 24 [kg]
total weight ribs (76 ribs) : 88 [kg]
load on front upper spar (clmax) per running metre : 754.2 [N]
load on rear upper spar (vmax) per running metre : 348.6 [N]
total weight 8 spars : 62 [kg]
weight wings : 174 [kg]
weight wing/square meter : 4.61 [kg]
weight 8 interplane struts & cabane : 21.2 [kg]
weight cables (71 [m]) : 6.9 [kg] (= 97 [gram] per metre)
diameter cable : 4.0 [mm]
weight fin & rudder (1.7 [m2]) : 7.9 [kg]
weight stabilizer & elevator (4.2 [m2]): 19.8 [kg]
total weight wing surfaces & bracing : 229 [kg] (15.6 [%])
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weight machine-gun(s) : 28.6 [kg]
weight Scarff ring mounting mg :5.0 [kg]
weight ammunition magazine(s) :1.8 [kg]
weight synchronizing system : 1.0 [kg]
weight Aldis gunsight : 0.8 [kg]
weight armament : 37 [kg]
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wheel pressure : 737.0 [kg]
weight 2 wheels (760 [mm] by 95 [mm]) : 26.5 [kg]
weight tailskid : 5.1 [kg]
weight undercarriage with axle 30.6 [kg]
total weight landing gear : 62.2 [kg] (4.2 [%]
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calculated empty weight : 940 [kg](63.8 [%])
weight oil for 3.7 hours flying : 11.2 [kg]
weight cooling fluids : 43.7 [kg]
weight 5 drums empty : 1.0 [kg]
weight ammunition (635 rounds) : 22.6 [kg]
weight Very pistol with cartridges : 3.6 [kg]
weight automatic pistol with spare magazines : 1.2 [kg]
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calculated operational weight empty : 1022 [kg] (69.4 [%])
published operational weight empty : 975 [kg] (66.1 [%])
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weight crew : 162 [kg]
weight fuel for 2.0 hours flying : 86 [kg]
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operational weight : 1270 [kg](86.2 [%])
bomb load : 108 [kg]
operational weight bombing mission : 1378 [kg]
fuel reserve : 65 [kg] enough for 1.51 [hours] flying
possible additional useful load : 32 [kg]
operational weight fully loaded : 1474 [kg] with fuel tank filled for 100 [%]
published maximum take-off weight : 1474 [kg] (100.0 [%])
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calculation : * 4 * (engine power)
power loading (operational without bombload) : 6.28 [kg/kW]
total power : 202.3 [kW] at 2250 [r.p.m]
calculation : *5* (loads)
manoeuvre load : 3.7 [g] at 1000 [m]
limit load : 3.75 [g] ultimate load : 5.6 [g] load factor : 1.6 [g]
design flight time : 2.47 [hours]
design cycles : 202 sorties, design hours : 500 [hours]
operational wing loading : 331 [N/m^2]
wing stress (3 g) during operation : 215 [N/kg] at 3g emergency manoeuvre
calculation : *6* (angles of attack)
angle of attack zero lift : -1.42 ["]
max. angle of attack (stalling angle) : 12.16 ["]
angle of attack at max. speed : 1.02 ["]
calculation : *7* (lift & drag ratios
lift coefficient at angle of attack 0° :0.12 [ ]
lift coefficient at max. angle of attack : 1.15 [ ]
lift coefficient at max. speed : 0.21 [ ]
induced drag coefficient at max. speed : 0.0032 [ ]
drag coefficient at max. speed : 0.0304 [ ]
drag coefficient (zero lift) : 0.0272 [ ]
calculation : *8* (speeds
stalling speed at sea-level (OW): 78 [km/u]
landing speed at sea-level (OW without bombload): 94 [km/hr]
min. drag speed (max endurance) : 127 [km/hr] at 3276 [m](power :36 [%])
min. power speed (max range) : 134 [km/hr] at 3276 [m] (power:38 [%])
max. rate of climb speed : 120.5 [km/hr] at sea-level
cruising speed : 178 [km/hr] op 3276 [m] (power:57 [%])
design speed prop : 188 [km/hr]
maximum speed : 198 [km/hr] op 1500 [m] (power:83 [%])
climbing speed at sea-level (without bombload) : 324 [m/min]
calculation : *9* (regarding various performances)
take-off distance at sea-level : 144 [m]
lift/drag ratio : 11.10 [ ]
max. practical ceiling : 6850 [m] with flying weight :1097 [kg]
practical ceiling (operational weight): 5975 [m] with flying weight :1270 [kg]
practical ceiling fully loaded (mtow- 1 hour fuel) : 5200 [m] with flying weight :1431 [kg]
published ceiling (6553 [m]
climb to 1500m (without bombload) : 5.08 [min]
climb to 3000m (without bombload) : 12.05 [min]
max. dive speed : 414.7 [km/hr] at 4200 [m] height
load factor at max. angle turn 2.21 ["g"]
turn radius at 500m: 56 [m]
time needed for 360* turn 10.7 [seconds] at 500m
calculation *10* (action radius & endurance)
operational endurance : 3.51 [hours] with 2 crew and 140 [kg] bombload and 100.0 [%] fuel
published endurance : 3.09 [hours] with 2 crew and possible useful (bomb) load : 157 [kg] and 88.1 [%] fuel
action radius : 561 [km] with 2 crew and 20[kg] photo camera/radio transmitter or bombload
max range theoretically with additional fuel tanks for total 560 [litre] fuel : 1710 [km]
useful load with action-radius 250km : 291 [kg]
production : 51.80 [tonkm/hour]
oil and fuel consumption per tonkm : 0.89 [kg]
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Literature :
Warplanes WOI page 125/138/156f/158td
Praktisch handboek vliegtuigen deel 1 page 191
Fighters 1914-19 page 27,106
Jane’s fighting aircraft WOI page 28f, 63df
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 21 August 2019 contact : info.aircraftinvestigation@gmail.com python 3.7.4