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weight and performance calculations for the Zeppelin LZ80 L35
Zeppelin LZ80 L35
role : maritime patrol, ASW, reconnaissance & bombing raids
importance : ****
first flight : 20 October 1916 operational :
country : Germany
design :
class : R
production : R-class :
general information :
13 reconnaissance missions around the North and Baltic Sea; three attacks on England dropping 4,284 kg (9,445 lb) of bombs. Decommissioned in September 1918.
The designers tried to make LZ 80 (L-35) more efficient by removing one engine making the airship 1,750 kilograms (3,860 lb) lighter
users :
crew : 18
armament : 4 movable 7.92 [mm] (0.312 in) Parabellum MG 14 machine-guns
engine : 5 Maybach HS Lu liquid-cooled 6 -cylinder inline engine 240 [hp](179.0 KW)
dimensions :
Diameter : 23.9 [m], length : 198.0 [m], gas cells : 19.0
volume: 55200.0 [m^3]
weights :
max.take-off weight : 63800 [kg]
empty weight operational : 31400 [kg] bombload : 5000.0 [kg]
tank capacity : 8527 [liter] (6250 [kg])
performance :
maximum speed : 103 [km/hr] op 2000 [m]
cruise speed : 81 [km/u] op 2000 [m]
climbing speed : 600 [m/min]
service ceiling : 3900 [m]
range: 7400 [km]
description :
engines & crew in gondolas below the Zeppelin
airscrew :
five fixed pitch 4 -bladed Lorenzen pusher airscrews with max. efficiency :0.57 [ ]
estimated diameter airscrew 2.50 [m]
angle of attack prop : 11.76 [ ]
reduction : 1.00 [ ]
airscrew revs : 1400 [r.p.m.]
pitch at Max speed 1.23 [m]
blade-tip speed at Vmax and max revs. : 183 [m/s]
calculation : *1* (dimensions)
calculated volume : 55207 [m^3]
fineness ratio (length/diameter) : 8.28 [ ]
calculation : *2* (fuel consumption)
oil consumption : 10.7 [kg/hr]
fuel consumption (cruise speed) : 208.9 [kg/hr] (285.0 [litre/hr]) at 77 [%] power
fuel consumption (long range cruise speed) : 68.4 [kg/hr]
distance flown for 1 kg fuel : 1.18 [km/kg]
calculation : *3* (weight)
weight engine(s) dry : 1950.0 [kg] = 2.18 [kg/KW]
weight transmission & gear (engines in fuselage) : 357.9 [kg]
weight 1334 litre oil tank : 168.0 [kg]
oil tank filled with 6.7 litre oil : 6.0 [kg]
oil in engine 50 litre oil : 44.7 [kg]
fuel in engine 6 litre fuel : 4.5 [kg]
weight 121 litre gravity patrol tank(s) : 11.9 [kg]
weight radiator : 134.2 [kg]
weight exhaust pipes & fuel lines 241.4 [kg]
weight self-starter : 21.9 [kg]
weight cowling 35.8 [kg]
weight airscrew(s) (wood) incl. boss & bolts : 163.2 [kg]
total weight propulsion system : 2972 [kg](4.7 [%])
***************************************************************
fuselage skeleton (aluminium gauge : 4.47 [cm]): 17117 [kg]
bracing : 565.5 [kg]
weight envelop covering (doped linen fabric 14867 [m2]) : 4757 [kg]
weight gas cell covering (doped linen fabric 11500 [m2]) : 3680 [kg]
weight gondolas : 818.4 [kg]
weight controls + indicators: 62.5 [kg]
weight seats : 54.0 [kg]
weight other details, lighting set, etc. : 21.1 [kg]
weight transceiver : 27 [kg]
weight bomb storage : 350.0 [kg]
weight Görz bomb sight with 90 cm Zeiss-telescope: 2.5 [kg]
weight interior + equipment + fuel lines: 851 [kg]
weight engine mounts & firewalls : 45 [kg]
total weight fuselage : 28351 [kg](44.4 [%])
***************************************************************
weight machine-gun(s) : 38.0 [kg]
weight pivot mounting mg :24.0 [kg]
weight armament : 62 [kg]
********************************************************************
calculated empty weight : 31385 [kg](49.2 [%])
published empty weight : 31400 [kg] (49.2 [%])
The last test flight of the Siemens torpedo glider was performed on August 2, 1918. On this flight a 1,000 kilograms (2,200 lb) biplane glider was launched from Zeppelin LZ 80 (L 35). The glider was released from 1,500 metres (4,900 ft) over the Havel river and worked as expected until its control wire that attached the glider to the Zeppelin snapped and the glider spun out of control.
weight crew : 1458 [kg]
gross weight : 32843 [kg](51.5 [%])
weight cooling fluids : 184.3 [kg]
weight 4 drums empty : 9.1 [kg]
weight ammunition (2000 rounds) : 65.5 [kg]
weight signal pistol with cartridges : 3.6 [kg]
weight automatic pistols with spare magazines : 21.6 [kg]
*******************************************************************
calculated operational weight empty : 33118 [kg] (51.9 [%])
weight oil for 100.5 hours flying : 1177.2 [kg]
weight fuel for 91.4 hours flying : 6250 [kg]
********************************************************************
Operational weight long range reconnaissance mission : 40545 [kg](63.6 [%])
at max. cruise height of : 4200 [m]
bomb load : 5000 [kg]
operational weight long range bombing mission : 45545 [kg]
at max. cruise height of : 3150 [m]
weight hydrogen at s/l : 3919 [kg]
capacity : 32316 [kg] typical disposable load
calculated useful lift at s/l : 63701 [kg]
published useful lift : 63800 [kg] (100.0 [%])
calculation : * 4 * (loading)
power loading (long range bomb mission) : 50.90 [kg/kW]
power loading (operational weight empty) : 37.01 [kg/kW]
power/volume : 16 [W/M^3]
total power : 894.8 [kW] at 1400 [r.p.m]
limit load : 1.5 [g] ultimate load : 2.2 [g] load factor : 0.9 [g]
design flight time : 36.54 [hours]
design cycles : 99 sorties, design hours : 3600 [hours]
drag coefficient at max. speed : 0.0025 [ ]
lifting force at s/l : 663126 [N]
lifting force at 3900 [m] : 448123 [N]
practical ceiling (operational weight) : 3900 [m] with flying weight :41777 [kg]
theoretical ceiling (skeleton crew, part hydrogen released at height) : 6450 [m] with
flying weight :32166 [kg]
climb to 3000m (operational weight without bombload) : 5.00 [min]
calculation *10* (action radius & endurance)
published range : 7400 [km] (91.4 [hour] flying at 81 [km/h] cruise speed)
useful load over 1000 [km]: 5000 [kg]
production : 405.00 [tonkm/hour]
oil and fuel consumption per tonkm : 0.54 [kg]
Literature :
Section of the Zeppelin L35 LZ80 by maxpinucci on DeviantArt
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 05 March 2023 contact : info.aircraftinvestigation@gmail.com python 3.7.4
notes :
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