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weight and performance calculations for the Caproni Ca.5 (Ca.46)
Caproni Ca.5 (Ca.46)
role : heavy bomber
importance : ***
first flight : operational : October 1918
country : Italy
design :
production : 225 aircraft
general information :
redesigned Caproni bomber, with more powerful engines.
users : Italy
crew : 4
armament : 2 movable 7.70 [mm] (0.303 in) Lewis machine-guns
engine : 3 FIAT A-12 bis liquid-cooled 6 -cylinder inline engine 300 [hp](220.7 KW)
dimensions :
wingspan : 23.4 [m], length : 12.62 [m], height : 4.4[m]
wing area : 150.0 [m^2]
weights :
max.take-off weight : 5300 [kg]
empty weight operational : 3350 [kg] bombload : 540 [kg]
performance :
maximum speed : 152 [km/hr] at sea-level
service ceiling : 4500 [m]
endurance : 4.0 [hours]
estimated action radius : 274 [km]
description :
4-bay biplane with fixed underwing 8 -wheel landing gear and tail strut
two spar upper and lower wing
tail supported by two fabric/plywood covered tail booms
2 engines attached to the wings 1 in the fuselage, landing gear attached to the wings, bombload attached to fuselage
two fuel tanks in the tail booms, one fuel tank in the fuselage
airscrew :
two fixed pitch 2 -bladed tractor airscrews and one fixed pitch pusher propeller with max. efficiency :0.64 [ ]
estimated diameter airscrew 2.85 [m]
angle of attack prop : 12.51 [ ]
fine pitch
reduction : 1.00 [ ]
airscrew revs : 1700 [r.p.m.]
pitch at Max speed 1.49 [m]
blade-tip speed at Vmax and max revs. : 257 [m/s]
calculation : *1* (dimensions)
mean wing chord : 3.21 [m]
calculated wing chord (rounded tips): 3.49 [m]
wing aspect ratio : 7.30 []
estimated gap : 2.35 [m]
gap/chord : 0.73 [ ]
seize (span*length*height) : 1299 [m^3]
calculation : *2* (fuel consumption)
oil consumption : 15.2 [kg/hr]
fuel consumption(cruise speed) : 156.3 [kg/hr] (213.2 [litre/hr]) at 64 [%] power
distance flown for 1 kg fuel : 0.88 [km/kg]
estimated total fuel capacity : 968 [litre] (709 [kg])
calculation : *3* (weight)
weight engine(s) dry : 1314.0 [kg] = 1.99 [kg/KW]
weight 98 litre oil tank : 8.3 [kg]
oil tank filled with 5.0 litre oil : 4.5 [kg]
oil in engine 37 litre oil : 33.1 [kg]
fuel in engine 5 litre fuel : 3.3 [kg]
weight 91 litre gravity patrol tank(s) : 13.6 [kg]
weight radiator : 94.9 [kg]
weight exhaust pipes & fuel lines 32.5 [kg]
weight self-starter : 5.4 [kg]
weight cowling 8.8 [kg]
weight airscrew(s) (wood) incl. boss & bolts : 99.3 [kg]
total weight propulsion system : 1609 [kg](30.4 [%])
***************************************************************
tail boom plywood covering (monocoque) : 84 [kg]
fuselage skeleton (wood gauge : 5.40 [cm]): 192 [kg]
bracing : 17.1 [kg]
fuselage covering ( 42.1 [m2] doped linen fabric) : 13.5 [kg]
weight controls + indicators: 8.9 [kg]
weight seats : 12.0 [kg]
weight other details, lighting set, etc. : 13.1 [kg]
weight bomb storage : 37.8 [kg]
weight bomb sight : 1.2 [kg]
weight 292 [litre] main fuel tank empty : 23.4 [kg]
additional in each tail boom a 292 [litre] fuel tank empty : 46.8 [kg]
weight interior + equipment + fuel lines: 211 [kg]
weight engine mount and firewall : 11 [kg]
total weight fuselage : 672 [kg](12.7 [%])
***************************************************************
weight wing covering (doped linen fabric) : 96 [kg]
total weight ribs (135 ribs) : 315 [kg]
weight engine mounts : 22 [kg]
load on front upper spar (clmax) per running metre : 690.5 [N]
load on rear upper spar (vmax) per running metre : 475.8 [N]
total weight 8 spars : 138 [kg]
weight wings : 549 [kg]
weight wing/square meter : 3.66 [kg]
weight 16 interplane struts & cabane : 109.3 [kg]
weight cables (174 [m]) : 37.8 [kg] (= 217 [gram] per metre)
diameter cable : 6.0 [mm]
weight fin & rudder (6.4 [m2]) : 24.2 [kg]
weight stabilizer & elevator (16.9 [m2]): 62.9 [kg]
total weight wing surfaces & bracing : 805 [kg] (15.2 [%])
*******************************************************************
weight machine-gun(s) : 26.0 [kg]
weight pivot mounting mg :12.0 [kg]
weight armament : 38 [kg]
********************************************************************
wheel pressure : 662.5 [kg]
weight 8 wheels (920 [mm] by 112 [mm]) : 122.6 [kg]
weight tailskid : 3.5 [kg]
weight undercarriage with axle 74.0 [kg]
total weight landing gear : 200.2 [kg] (3.8 [%]
*******************************************************************
********************************************************************
calculated empty weight : 3325 [kg](62.7 [%])
weight oil for 4.8 hours flying : 73.1 [kg]
weight cooling fluids : 143.0 [kg]
weight 7 drums empty : 2.9 [kg]
weight ammunition (658 rounds) : 20.9 [kg]
weight signal pistol with cartridges : 3.6 [kg]
weight automatic pistol with spare magazines : 1.2 [kg]
*******************************************************************
calculated operational weight empty : 3566 [kg] (67.3 [%])
published operational weight empty : 3350 [kg] (63.2 [%])
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weight crew : 324 [kg]
weight fuel for 2.0 hours flying : 313 [kg]
********************************************************************
operational weight : 4203 [kg](79.3 [%])
bomb load : 540 [kg]
operational weight bombing mission : 4743 [kg]
fuel reserve : 397 [kg] enough for 2.54 [hours] flying
possible additional useful load : 160 [kg]
operational weight fully loaded : 5300 [kg] with fuel tank filled for 100 [%]
published maximum take-off weight : 5300 [kg] (100.0 [%])
calculation : * 4 * (engine power)
power loading (Take-off) : 8.01 [kg/kW]
total power : 662.0 [kW] at 1700 [r.p.m]
calculation : *5* (loads)
manoeuvre load : 2.3 [g] at 1000 [m]
limit load : 3.0 [g] ultimate load : 4.5 [g] load factor : 1.1 [g]
design flight time : 3.20 [hours]
design cycles : 125 sorties, design hours : 400 [hours]
wing loading (MTOW) : 347 [N/m^2]
wing stress (3 g) during operation : 254 [N/kg] at 3g emergency manoeuvre
calculation : *6* (angles of attack)
angle of attack zero lift : -1.20 ["]
max. angle of attack (stalling angle) : 12.52 ["]
angle of attack at max. speed : 1.84 ["]
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 : 0.25 [ ]
induced drag coefficient at max. speed : 0.0050 [ ]
drag coefficient at max. speed : 0.0608 [ ]
drag coefficient (zero lift) : 0.0558 [ ]
calculation : *8* (speeds
stalling speed at sea-level (OW): 71 [km/u]
landing speed at sea-level (OW without bombload): 85 [km/hr]
min. drag speed (max endurance) : 92 [km/hr] at 2250 [m](power :38 [%])
min. power speed (max range) : 105 [km/hr] at 2250 [m] (power:41 [%])
max. rate of climb speed : 91.5 [km/hr] at sea-level
cruising speed : 137 [km/hr] op 2250 [m] (power:65 [%])
design speed prop : 144 [km/hr]
maximum speed : 152 [km/hr] op 100 [m] (power:99 [%])
climbing speed at sea-level (without bombload) : 329 [m/min]
calculation : *9* (regarding various performances)
take-off distance at sea-level : 104 [m]
lift/drag ratio : 7.60 [ ]
max. practical ceiling : 5450 [m] with flying weight :3700 [kg]
practical ceiling (operational weight): 4825 [m] with flying weight :4203 [kg]
practical ceiling fully loaded (mtow- 1 hour fuel) : 3725 [m] with flying weight :5144 [kg]
published ceiling (4500 [m]
climb to 1500m (without bombload) : 5.13 [min]
climb to 3000m (without bombload) : 12.87 [min]
max. dive speed : 371.5 [km/hr] at 2725 [m] height
load factor at max. angle turn 1.93 ["g"]
turn radius at 500m: 55 [m]
time needed for 360* turn 11.6 [seconds] at 500m
calculation *10* (action radius & endurance)
operational endurance : 4.54 [hours] with 4 crew and 700 [kg] bombload and 100.0 [%] fuel
published endurance : 4.00 [hours] with 4 crew and possible useful (bomb) load : 784 [kg] and 88.1 [%] fuel
action radius : 608 [km] with 4 crew and 20[kg] photo camera/radio transmitter or bombload
max range theoretically with additional fuel tanks for total 2290 [litre] fuel : 1469 [km]
useful load with action-radius 250km : 838 [kg]
production : 114.69 [tonkm/hour]
oil and fuel consumption per tonkm : 1.50 [kg]
Literatuur :
Warplanes WW1 page 130,134fd,135t
Praktisch handboek vliegtuigen deel 1 page 223f,227d
Bombers 1914-19 page 85,134ftd
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/
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(c) B van der Zalm 23 November 2019 contact : info.aircraftinvestigation@gmail.com python 3.7.4