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weight and performance calculations for the Lohner Type L

Sinking of French submarine Foucault by Lohner L type seaplanes of ...

Sinking of French submarine Foucault by a Lohner Type L

Lohner Type L

role : light maritime two-seat patrol aircraft, ASW

importance : ***

first flight : operational : September 1915

country : Austria

design :

production : 160 aircraft

general information :

Widely used over the Adriatic sea

users : Austro-Hungaria

crew : 2

armament : 1 movable 8.00 [mm] (0.315 in) Schwarzlose M.7 machine-gun for the observer

engine : 1 Austro-Daimler liquid-cooled 6 -cylinder inline engine 160 [hp](119.3 KW)

dimensions :

wingspan : 16.2 [m], length : 10.25 [m], height : 3.85[m]

wing area : 53.0 [m^2]

weights :

max.take-off weight : 1700 [kg]

empty weight operational : 1150 [kg] bombload : 200 [kg]

performance :

maximum speed : 110 [km/hr] at sea-level

service ceiling : 2500 [m]

endurance : 4.0 [hours]

estimated action radius : 198 [km]

Lohner L - Alchetron, The Free Social Encyclopedia

description :

2½-bay sesquiplane flying boat

2 (aid) tip floats

upper wingtips supported by slanted struts

two spar upper and lower wing

engine attached to top plane

airscrew :

fixed pitch 2 -bladed pusher airscrew with max. efficiency :0.63 [ ]

estimated diameter airscrew 2.36 [m]

angle of attack prop : 14.78 [ ]

fine pitch

reduction : 1.00 [ ]

airscrew revs : 1250 [r.p.m.]

pitch at Max speed 1.47 [m]

blade-tip speed at Vmax and max revs. : 157 [m/s]

calculation : *1* (dimensions)

mean wing chord : 2.18 [m]

calculated wing chord (rounded tips): 2.47 [m]

wing aspect ratio : 7.43 []

estimated gap : 2.01 [m]

gap/chord : 0.92 [ ]

seize (span*length*height) : 639 [m^3]

calculation : *2* (fuel consumption)

oil consumption : 2.9 [kg/hr]

fuel consumption(cruise speed) : 33.3 [kg/hr] (45.4 [litre/hr]) at 77 [%] power

distance flown for 1 kg fuel : 2.97 [km/kg]

estimated total fuel capacity : 206 [litre] (151 [kg])

calculation : *3* (weight)

weight engine(s) dry : 298.3 [kg] = 2.50 [kg/KW]

weight 18 litre oil tank : 2.3 [kg]

oil tank filled with 0.9 litre oil : 0.8 [kg]

oil in engine 7 litre oil : 6.0 [kg]

fuel in engine 1 litre fuel : 0.6 [kg]

weight 19 litre gravity patrol tank(s) : 1.9 [kg]

weight radiator : 17.1 [kg]

weight exhaust pipes & fuel lines 15.4 [kg]

weight cowling 4.8 [kg]

weight airscrew(s) (wood) incl. boss & bolts : 19.0 [kg]

total weight propulsion system : 364 [kg](21.4 [%])

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fuselage skeleton (wood gauge : 6.81 [cm]): 122 [kg]

bracing : 11.0 [kg]

plywood/wood covering hull (gauche : 1.4 [cm]): 183.8 [kg]

weight controls + indicators: 7.4 [kg]

weight seats : 6.0 [kg]

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

weight bomb storage : 14.0 [kg]

weight 187 [litre] main fuel tank empty : 17.9 [kg]

weight engine mounts & firewalls : 6 [kg]

total weight fuselage : 373 [kg](21.9 [%])

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weight wing covering (doped linen fabric) : 34 [kg]

total weight ribs (64 ribs) : 101 [kg]

load on front upper spar (clmax) per running metre : 651.3 [N]

load on rear upper spar (vmax) per running metre : 256.4 [N]

total weight 8 spars : 94 [kg]

weight wings : 229 [kg]

weight wing/square meter : 4.32 [kg]

weight 12 interplane struts & cabane : 64.6 [kg]

weight cables (85 [m]) : 12.6 [kg] (= 148 [gram] per metre)

diameter cable : 4.9 [mm]

weight fin & rudder (3.0 [m2]) : 13.6 [kg]

weight stabilizer & elevator (5.1 [m2]): 22.3 [kg]

total weight wing surfaces & bracing : 342 [kg] (20.1 [%])

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weight machine-gun(s) : 15.0 [kg]

weight pivot mounting mg :6.0 [kg]

weight armament : 21 [kg]

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weight 2 tip floats : 34 [kg] (2.0 [%])

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

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calculated empty weight : 1133 [kg](66.7 [%])

weight oil for 4.8 hours flying : 13.7 [kg]

weight cooling fluids : 24.6 [kg]

weight 1 drums empty : 2.3 [kg]

weight ammunition (500 rounds) : 16.5 [kg]

weight automatic pistol with spare magazines : 1.2 [kg]

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

calculated operational weight empty : 1189 [kg] (70.0 [%])

published operational weight empty : 1150 [kg] (67.6 [%])

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~U~

weight crew : 162 [kg]

weight fuel for 2.0 hours flying : 67 [kg]

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operational weight : 1418 [kg](83.4 [%])

bomb load : 200 [kg]

operational weight bombing mission : 1618 [kg]

fuel reserve : 82 [kg] enough for 2.47 [hours] flying

operational weight fully loaded : 1700 [kg] with fuel tank filled for 98 [%]

published maximum take-off weight : 1700 [kg] (100.0 [%])

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calculation : * 4 * (engine power)

power loading (operational without bombload) : 11.88 [kg/kW]

total power : 119.3 [kW] at 1250 [r.p.m]

calculation : *5* (loads)

manoeuvre load : 1.4 [g] at 1000 [m]

limit load : 3.5 [g] ultimate load : 5.2 [g] load factor : 1.9 [g]

design flight time : 3.20 [hours]

design cycles : 281 sorties, design hours : 900 [hours]

operational wing loading : 262 [N/m^2]

wing stress (3 g) during operation : 182 [N/kg] at 3g emergency manoeuvre

calculation : *6* (angles of attack)

angle of attack zero lift : -1.19 ["]

max. angle of attack (stalling angle) : 12.47 ["]

angle of attack at max. speed : 4.32 ["]

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 : 0.46 [ ]

induced drag coefficient at max. speed : 0.0123 [ ]

drag coefficient at max. speed : 0.0806 [ ]

drag coefficient (zero lift) : 0.0683 [ ]

calculation : *8* (speeds

stalling speed at sea-level (OW): 70 [km/u]

landing speed at sea-level (OW without bombload): 83 [km/hr]

min. drag speed (max endurance) : 81 [km/hr] at 1250 [m](power :56 [%])

min. power speed (max range) : 81 [km/hr] at 1250 [m] (power:56 [%])

max. rate of climb speed : 70.6 [km/hr] at sea-level

cruising speed : 99 [km/hr] op 1250 [m] (power:73 [%])

design speed prop : 104 [km/hr]

maximum speed : 110 [km/hr] op 100 [m] (power:99 [%])

climbing speed at sea-level (without bombload) : 143 [m/min]

calculation : *9* (regarding various performances)

take-off distance at sea-level : 309 [m]

take-off distance erg lang, check if emergency power for TO is possible

lift/drag ratio : 8.00 [ ]

max. practical ceiling : 4100 [m] with flying weight :1269 [kg]

practical ceiling (operational weight) : 3300 [m] with flying weight :1418 [kg] line 3385

practical ceiling fully loaded (mtow- 1 hour fuel) : 2050 [m] with flying weight :1667 [kg]

published ceiling (2500 [m]

climb to 1500m (operational weight without bombload) : 12.13 [min]

max. dive speed : 279.0 [km/hr] at 1050 [m] height

load factor at max. angle turn 1.59 ["g"]

turn radius at 500m: 51 [m]

time needed for 360* turn 12.9 [seconds] at 500m

calculation *10* (action radius & endurance)

operational endurance : 4.47 [hours] with 2 crew and 200 [kg] bombload and 98.4 [%] fuel

published endurance : 4.00 [hours] with 2 crew and possible useful (bomb) load : 216 [kg] and 88.1 [%] fuel

action radius : 489 [km] with 2 crew and 20[kg] photo camera or bombload

max range theoretically with additional fuel tanks for total 610 [litre] fuel : 1331 [km]

useful load with action-radius 250km : 279 [kg]

production : 27.66 [tonkm/hour]

oil and fuel consumption per tonkm : 1.31 [kg]

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Literature :

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 31 May 2020 contact : info.aircraftinvestigation@gmail.com python 3.7.4