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weight and performance calculations for the Hannover Cl.IIIa
Hannover Cl.IIIa
role : light ground attack aircraft and co-op
importance : ***
first flight : operational : March 1918
country : Germany
design :
production : 617 aircraft
general information :
Designed as escort fighter it was soon used for ground attack. The Argus engine power fell of rapidly at height but was ok for low level operations. The Cl.III was developed from the CLII to incorporate the Mercedes DIII engine, but shortage of this engine (it was allocated to fighters) made it necessary to return to the Argus engine, this was indicated as CL.IIIa. Fuselage was plywood-covered giving good strength and could take a fare amount of punishment
petrol capacity : 37.25 gallons = 169 litre oil capacity : 3 gallons = 13.6 litre
gap : (about) 1.60 m propeller : 2.84m diameter
climb to 1524m : 7 mins.rate of climb : 180 m/min
climb to 3048m : 18 mins
Maximum speed : 154 km/hr at 3048m , revolutions : 1565
Service ceiling : 4572m
Chord upper plane : 1.79m lower plane 1.30m
users : Luftwaffe
crew : 2
armament : 1 synchronized 7.92 [mm] (0.312 in) Spandau LMG 08/15 machine-gun
and 1 movable 7.92 [mm] (0.312 in) Parabellum MG 14 machine-gun for the observer
engine : 1 Argus As.III liquid-cooled 6 -cylinder inline engine 180 [hp](132.4 KW)
dimensions :
wingspan : 11.7 [m], length : 7.58 [m], height : 2.8[m]
wing area : 32.7 [m^2]
weights :
max.take-off weight : 1081 [kg]
empty weight operational : 717 [kg] bombload : 0 [kg]
performance :
maximum speed : 166 [km/u] op 600 [m]
climbing speed : 188 [m/min]
service ceiling : 4572 [m]
endurance : 3.7 [hours]
estimated action radius : 276 [km]
description :
1-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 :0.64 [ ]
diameter airscrew 2.84 [m]
angle of attack prop : 18.30 [ ]
reduction : 1.00 [ ]
airscrew revs : 1250 [r.p.m.]
pitch at Max speed 2.21 [m]
blade-tip speed at Vmax and max revs. : 192 [m/s]
calculation : *1* (dimensions)
mean wing chord : 1.40 [m]
calculated wing chord (rounded tips): 1.54 [m]
wing aspect ratio : 8.37 []
gap : 1.60 [m]
gap/chord : 1.14 [ ]
seize (span*length*height) : 248 [m^3]
calculation : *2* (fuel consumption)
oil consumption : 3.3 [kg/hr]
fuel consumption(cruise speed) : 29.5 [kg/hr] (40.3 [litre/hr]) at 65 [%] power
distance flown for 1 kg fuel : 5.06 [km/kg]
estimated total fuel capacity : 169 [litre] (124 [kg])
calculation : *3* (weight)
weight engine(s) dry : 295.0 [kg] = 2.23 [kg/KW]
weight 20 litre oil tank : 2.5 [kg]
oil tank filled with 1.0 litre oil : 0.9 [kg]
oil in engine 7 litre oil : 6.6 [kg]
fuel in engine 1 litre fuel : 0.7 [kg]
weight 17 litre gravity patrol tank(s) : 1.7 [kg]
weight radiator : 19.0 [kg]
weight exhaust pipes & fuel lines 13.3 [kg] 
CL.IIIa shot down by Eddie Rickenbacker 02 October 1918
weight cowling 5.3 [kg]
weight airscrew(s) (wood) incl. boss & bolts : 19.9 [kg]
total weight propulsion system : 362 [kg](33.5 [%])
***************************************************************
fuselage skeleton (wood gauge : 5.37 [cm]): 56 [kg]
bracing : 3.0 [kg]
fuselage covering ( 10.9 [m2] doped linen fabric) : 3.5 [kg]
weight controls + indicators: 6.1 [kg]
weight seats : 6.0 [kg]
weight other details, lighting set, etc. : 5.1 [kg]
weight 151 [litre] main fuel tank empty : 14.5 [kg]
weight engine mounts & firewalls : 7 [kg]
total weight fuselage : 101 [kg](9.3 [%])
***************************************************************
weight wing covering (doped linen fabric) : 21 [kg]
total weight ribs (63 ribs) : 64 [kg]
load on front upper spar (clmax) per running metre : 480.9 [N]
load on rear upper spar (vmax) per running metre : 262.9 [N]
total weight 8 spars : 38 [kg]
weight wings : 123 [kg]
weight wing/square meter : 3.76 [kg]
weight 4 interplane struts & cabane : 12.0 [kg]
weight cables (56 [m]) : 3.3 [kg] (= 59 [gram] per metre)
diameter cable : 3.1 [mm]
weight fin & rudder (1.6 [m2]) : 6.2 [kg]
weight stabilizer & elevator (3.7 [m2]): 14.1 [kg]
total weight wing surfaces & bracing : 158 [kg] (14.7 [%])
*******************************************************************
weight machine-gun(s) : 26.5 [kg]
weight Schneider ring mounting mg :5.5 [kg]
weight ammunition magazine(s) :2.3 [kg]
weight Fokker Zentralsteuerung synchronization gear : 1.0 [kg]
weight armament : 35 [kg]
********************************************************************
wheel pressure : 540.5 [kg]
weight 2 wheels (740 [mm] by 89 [mm]) : 18.8 [kg]
weight tailskid : 1.7 [kg]
weight undercarriage with axle 24.0 [kg]
total weight landing gear : 44.5 [kg] (4.1 [%]
*******************************************************************
********************************************************************
calculated empty weight : 701 [kg](64.9 [%])
weight oil for 4.4 hours flying : 14.7 [kg]
weight cooling fluids : 27.3 [kg]
weight 1 drums empty : 2.3 [kg]
weight ammunition (1000 rounds) : 30.5 [kg]
weight signal pistol with cartridges : 3.6 [kg]
weight automatic pistol with spare magazines : 1.2 [kg]
*******************************************************************
calculated operational weight empty : 779 [kg] (72.0 [%])
published operational weight empty : 717 [kg] (66.3 [%])
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weight crew : 162 [kg]
weight fuel for 2.0 hours flying : 59 [kg]
********************************************************************
operational weight : 1000 [kg](92.5 [%])
estimated bomb load : 50 [kg]
CL.IIIa shot down by Rickenbacker 02 October 1918. Eddie Rickenbacker was a famous American ace, he was member of the 94th aero squadron
operational weight bombing mission : 1050 [kg]
fuel reserve : 31 [kg] enough for 1.07 [hours] flying
operational weight fully loaded : 1081 [kg] with fuel tank filled for 73 [%]
published maximum take-off weight : 1081 [kg] (100.0 [%])
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calculation : * 4 * (engine power)
power loading (operational without bombload) : 7.55 [kg/kW]
total power : 132.4 [kW] at 1250 [r.p.m]
calculation : *5* (loads)
manoeuvre load : 2.9 [g] at 1000 [m]
limit load : 3.25 [g] ultimate load : 4.9 [g] load factor : 1.4 [g]
design flight time : 2.95 [hours]
design cycles : 176 sorties, design hours : 520 [hours]
operational wing loading : 300 [N/m^2]
wing stress (3 g) during operation : 239 [N/kg] at 3g emergency manoeuvre
calculation : *6* (angles of attack)
angle of attack zero lift : -1.16 ["]
max. angle of attack (stalling angle) : 12.08 ["]
angle of attack at max. speed : 1.66 ["]
calculation : *7* (lift & drag ratios
lift coefficient at angle of attack 0° :0.10 [ ]
lift coefficient at max. angle of attack : 1.15 [ ]
lift coefficient at max. speed : 0.24 [ ]
induced drag coefficient at max. speed : 0.0040 [ ]
drag coefficient at max. speed : 0.0421 [ ]
drag coefficient (zero lift) : 0.0381 [ ]
calculation : *8* (speeds
stalling speed at sea-level (OW): 74 [km/u]
landing speed at sea-level (OW without bombload): 89 [km/hr]
min. drag speed (max endurance) : 103 [km/hr] at 2286 [m](power :38 [%])
min. power speed (max range) : 114 [km/hr] at 2286 [m] (power:41 [%])
max. rate of climb speed : 101.1 [km/hr] at sea-level
cruising speed : 149 [km/hr] op 2286 [m] (power:63 [%])
design speed prop : 158 [km/hr]
maximum speed : 166 [km/hr] op 600 [m] (power:92 [%])
climbing speed at sea-level (without bombload) : 277 [m/min]
calculation : *9* (regarding various performances)
take-off distance at sea-level : 147 [m]
lift/drag ratio : 9.86 [ ]
max. practical ceiling : 5950 [m] with flying weight :839 [kg]
practical ceiling (operational weight) : 5000 [m] with flying weight :1000 [kg] line 3385
practical ceiling fully loaded (mtow- 1 hour fuel) : 4725 [m] with flying weight :1051 [kg]
published ceiling (4572 [m]
climb to 1500m (without bombload) : 6.04 [min]
climb to 3000m (without bombload) : 14.89 [min]
max. dive speed : 397.6 [km/hr] at 3725 [m] height
load factor at max. angle turn 2.16 ["g"]
turn radius at 500m: 52 [m]
time needed for 360* turn 10.4 [seconds] at 500m
calculation *10* (action radius & endurance)
operational endurance : 4.08 [hours] with 2 crew and 20 [kg] useful load and 97.5 [%] fuel
published endurance : 3.69 [hours] with 2 crew and possible useful (bomb) load : 32 [kg] and 88.1 [%] fuel
action radius : 305 [km] with 2 crew and 20[kg] photo camera/radio transmitter or bombload
max range theoretically with additional fuel tanks for total 350 [litre] fuel : 1300 [km]
useful load with action-radius 250km : 158 [kg]
production : 23.60 [tonkm/hour]
oil and fuel consumption per tonkm : 1.39 [kg]
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Literature :
Warplanes WW1 page 103td,105f
Fighters 1914-19 page 24
Praktisch handboek vliegtuigen deel 1 page 294
Jane’s fighting aircraft WWI page 163,164
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 09 February 2020 contact : info.aircraftinvestigation@gmail.com python 3.7.4