Rumpler B.I

role : two-seat unarmed reconnaissance

first flight : Spring 1914 operational : December 1914

country : Germany

design :

production : 225 aircraft

general information :

Few literature was found on this plane even though there would be 225 aircraft built according to the internet. On 23 June 1914 Gustav Basser established an endurance record of 18 hours and 12 minutes, he flew in a Rumpler biplane (a B. 1?). Below you see a picture of his plane

users : Luftwaffe

crew : 2

armament : no fixed armament

engine : 1 Mercedes D.I liquid-cooled 6 -cylinder inline engine 100 [hp](73.6 KW)

dimensions :

wingspan : 13.0 [m], length : 8.4 [m], height : 3.1[m]

wing area : 38.0 [m^2]

weights :

max.take-off weight : 970 [kg]

empty weight operational : 650 [kg] bombload : 0 [kg]

performance :

maximum speed : 145 [km/hr] at sea-level

service ceiling : 3000 [m]

estimated endurance : 5.0 [hours]

estimated action radius : 326 [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 :0.62 [ ]

estimated diameter airscrew 2.77 [m]

angle of attack prop : 17.85 [ ]

reduction : 1.00 [ ]

airscrew revs : 1150 [r.p.m.]

pitch at Max speed 2.10 [m]

blade-tip speed at Vmax and max revs. : 172 [m/s]

calculation : *1* (dimensions)

mean wing chord : 1.46 [m]

calculated wing chord (rounded tips): 1.60 [m]

wing aspect ratio : 8.89 []

estimated gap : 1.88 [m]

gap/chord : 1.29 [ ]

seize (span*length*height) : 339 [m^3]

calculation : *2* (fuel consumption)

oil consumption : 1.7 [kg/hr]

fuel consumption(cruise speed) : 23.4 [kg/hr] (32.0 [litre/hr]) at 73 [%] power

distance flown for 1 kg fuel : 5.57 [km/kg]

estimated total fuel capacity : 181 [litre] (133 [kg])

calculation : *3* (weight)

weight engine(s) dry : 191.2 [kg] = 2.60 [kg/KW]

weight 13 litre oil tank : 1.1 [kg]

oil tank filled with 0.6 litre oil : 0.5 [kg]

oil in engine 4 litre oil : 3.7 [kg]

fuel in engine 1 litre fuel : 0.4 [kg]

weight 14 litre gravity patrol tank(s) : 2.0 [kg]

weight radiator : 10.5 [kg]

weight exhaust pipes & fuel lines 9.2 [kg]

weight cowling 2.9 [kg]

weight airscrew(s) (wood) incl. boss & bolts : 16.9 [kg]

total weight propulsion system : 237 [kg](24.5 [%])

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fuselage skeleton (wood gauge : 6.85 [cm]): 101 [kg]

bracing : 6.0 [kg]

fuselage covering ( 13.3 [m2] doped linen fabric) : 4.3 [kg]

weight controls + indicators: 6.5 [kg]

weight seats : 6.0 [kg]

weight other details, lighting set, etc. : 5.1 [kg]

weight 168 [litre] main fuel tank empty : 13.4 [kg]

weight engine mounts & firewalls : 4 [kg]

total weight fuselage : 146 [kg](15.0 [%])

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weight wing covering (doped linen fabric) : 24 [kg]

total weight ribs (54 ribs) : 58 [kg]

load on front upper spar (clmax) per running metre : 681.2 [N]

load on rear upper spar (vmax) per running metre : 205.3 [N]

total weight 8 spars : 66 [kg]

weight wings : 148 [kg]

weight wing/square meter : 3.89 [kg]

weight 8 interplane struts & cabane : 31.0 [kg]

weight cables (77 [m]) : 8.1 [kg] (= 104 [gram] per metre)

diameter cable : 4.1 [mm]

weight fin & rudder (2.0 [m2]) : 7.9 [kg]

weight stabilizer & elevator (4.3 [m2]): 16.9 [kg]

total weight wing surfaces & bracing : 212 [kg] (21.8 [%])

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weight armament : 0 [kg]

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wheel pressure : 485.0 [kg]

weight 2 wheels (770 [mm] by 97 [mm]) : 23.5 [kg]

weight tailskid : 2.8 [kg]

weight undercarriage with axle 22.7 [kg]

total weight landing gear : 49.0 [kg] (5.1 [%]

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calculated empty weight : 644 [kg](66.4 [%])

weight oil for 6.0 hours flying : 10.1 [kg]

weight cooling fluids : 15.9 [kg]

weight automatic pistol with spare magazines : 1.2 [kg]

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

calculated operational weight empty : 671 [kg] (69.2 [%])

published operational weight empty : 650 [kg] (67.0 [%])

On January 10, 1915, the Rumpler B.I S/n B543 of FA23 flown by Lt. Fritz Keller and Observer Hpt Otto von Falkenstein was shot down near Amiens by the French pilot Eugene Gilbert and his observer Lt. Puechredon. Lt. Keller was wounded and captured. Von Falkenstein died, he was the commander of FA23. Gilbert would later become the 2^th Ace of France, after Pegoud.

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weight crew : 162 [kg]

weight fuel for 2.0 hours flying : 47 [kg]

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operational weight : 880 [kg](90.7 [%])

estimated bomb load : 50 [kg]

operational weight bombing mission : 930 [kg]

weight camera : 20 [kg]

operational weight photo mission : 900 [kg]

fuel reserve : 70 [kg] enough for 2.98 [hours] flying

operational weight fully loaded : 970 [kg] with fuel tank filled for 88 [%]

published maximum take-off weight : 970 [kg] (100.0 [%])

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calculation : * 4 * (engine power)

power loading (operational without bombload) : 11.97 [kg/kW]

total power : 73.6 [kW] at 1150 [r.p.m]

calculation : *5* (loads)

manoeuvre load : 2.8 [g] at 1000 [m]

limit load : 3.75 [g] ultimate load : 5.6 [g] load factor : 2.5 [g]

design flight time : 3.50 [hours]

design cycles : 400 sorties, design hours : 1400 [hours]

operational wing loading : 232 [N/m^2]

wing stress (3 g) during operation : 179 [N/kg] at 3g emergency manoeuvre

calculation : *6* (angles of attack)

angle of attack zero lift : -1.14 ["]

max. angle of attack (stalling angle) : 11.86 ["]

angle of attack at max. speed : 1.49 ["]

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 : 0.23 [ ]

induced drag coefficient at max. speed : 0.0034 [ ]

drag coefficient at max. speed : 0.0300 [ ]

drag coefficient (zero lift) : 0.0266 [ ]

calculation : *8* (speeds

stalling speed at sea-level (OW): 65 [km/u]

landing speed at sea-level (OW without bombload): 78 [km/hr]

min. drag speed (max endurance) : 93 [km/hr] at 1500 [m](power :45 [%])

min. power speed (max range) : 99 [km/hr] at 1500 [m] (power:47 [%])

max. rate of climb speed : 90.0 [km/hr] at sea-level

cruising speed : 130 [km/hr] op 1500 [m] (power:70 [%])

design speed prop : 138 [km/hr]

maximum speed : 145 [km/hr] op 100 [m] (power:99 [%])

climbing speed at sea-level (without bombload) : 157 [m/min]

calculation : *9* (regarding various performances)

take-off distance at sea-level : 195 [m]

lift/drag ratio : 12.15 [ ]

max. practical ceiling : 4625 [m] with flying weight :763 [kg]

practical ceiling (operational weight): 3800 [m] with flying weight :880 [kg]

practical ceiling fully loaded (mtow- 1 hour fuel) : 3350 [m] with flying weight :947 [kg]

published ceiling (3000 [m]

climb to 1500m (without bombload) : 10.89 [min]

climb to 3000m (without bombload) : 28.39 [min]

max. dive speed : 377.0 [km/hr] at 2350 [m] height

load factor at max. angle turn 1.79 ["g"]

turn radius at 500m: 43 [m]

time needed for 360* turn 10.8 [seconds] at 500m

calculation *10* (action radius & endurance)

operational endurance : 4.98 [hours] with 2 crew and 20 [kg] useful load and 87.7 [%] fuel

published endurance : 5.00 [hours] with 2 crew and possible useful (bomb) load : 19 [kg] and 88.1 [%] fuel

action radius : 325 [km] with 2 crew and 20[kg] photo camera/radio transmitter or bombload

max range theoretically with additional fuel tanks for total 298 [litre] fuel : 1218 [km]

useful load with action-radius 250km : 129 [kg]

production : 16.84 [tonkm/hour]

oil and fuel consumption per tonkm : 1.49 [kg]

I_°°=/

Literature :

bombers 1914-19 page 115

en.wikepedia.org

www.militaryfactory.com

aviadejavu.ru

Jane’s FAWOI page 138f,184f

German aircraft of the first world war page 512df

They fought for the sky page 112c

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

literatuur :

notes : ******

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