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weight and performance calculations for the F.B.A. type H
FBA type H (s/n 5) on display at the Royal Museum of the Armed Forces and of Military History in Brussel. In the museum it is indicated as a Schreck type H, referring to the designer Louis Schreck. It has a Hispano Suiza 8A V-engine. This serial 5 is the sole surviving Type H in the world. © bvdz
F.B.A. type H
role : light maritime two-seat patrol aircraft, ASW
importance : ****
first flight : operational : June 1917
country : France
design : Louis Schreck
production : 2000 aircraft
general information :
The Type H was the major production version of the FBA series and was operated by
several air arms during the latter part of the First World War. The great majority
served with French and Italian forces.
The Belgians operated the type H from September 1917. Smaldeel Calais (l’escadrille
d’hydravion Belges) operated 5 FBA Type H over the North Sea and the Canal coast for ASW (anti-submarine), sea-mine spotting and reconnaissance duties. Two Belgian type H flying boats were used to ferry king Albert I and queen Elisabeth over the Canal to Folkestone on 05 July 1918. At first these aircraft (serials 1-5) had 150 hp Hispano Suiza 8Aa engines, but soon some of the aircraft were fitted with the more powerful 180 hp HS 8Ab engine or a Lorraine 8N of 160 hp. In an attack on 11 August 1918 a German U-boat type UB III (possible UB-108) was successful bombed and sunk by a flight of two Belgian and one France seaplanes.
Italy built 982 type H flying boats in license by several firms, but mostly by SIAI. Most of the Italian type H’s were powered by a 160 hp Isotta-Fraschini V4B. engine.
The type H was possibly the most widely built flying-boat on either side in WWI.
users : France, Belgium, Italy, Russia
crew : 3
armament : 1 movable 7.70 [mm] (0.303 in) Lewis machine-gun for the observer
engine : 1 Hispano Suiza 8Ab liquid-cooled 8 -cylinder V-engine 180 [hp](132.4 KW)
dimensions :
wingspan : 14.2 [m], length : 10.11 [m], height : 3.1[m]
wing area : 40.0 [m^2]
weights :
max.take-off weight : 1420 [kg]
empty weight operational : 984 [kg] bombload : 200 [kg]
performance :
maximum speed : 145 [km/hr] at sea-level
climbing speed : 125 [m/min]
service ceiling : 4876 [m]
estimated action radius : 225 [km]
description :
2˝-bay biplane flying boat
2 (aid) tip floats
upper wingtips supported by slanted struts
two spar upper and lower wing
engine, landing gear and fuel in or attached to fuselage, bombs attached to the the wing
airscrew :
fixed pitch 2 -bladed pusher airscrew with max. efficiency :0.64 [ ]
estimated diameter airscrew 2.78 [m]
angle of attack prop : 12.25 [ ]
fine pitch
reduction : 1.00 [ ]
airscrew revs : 1700 [r.p.m.]
pitch at Max speed 1.42 [m]
blade-tip speed at Vmax and max revs. : 251 [m/s]
calculation : *1* (dimensions)
mean wing chord : 1.61 [m]
calculated wing chord (rounded tips): 1.78 [m]
wing aspect ratio : 8.82 []
estimated gap : 1.62 [m]
gap/chord : 1.01 [ ]
seize (span*length*height) : 445 [m^3]
calculation : *2* (fuel consumption)
oil consumption : 2.0 [kg/hr]
fuel consumption(cruise speed) : 31.2 [kg/hr] (42.5 [litre/hr]) at 65 [%] power
distance flown for 1 kg fuel : 4.18 [km/kg]
estimated total fuel capacity : 167 [litre] (122 [kg])
calculation : *3* (weight)
weight engine(s) dry : 230.0 [kg] = 1.74 [kg/KW]
weight 12 litre oil tank : 1.6 [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 18 litre gravity patrol tank(s) : 1.8 [kg]
weight radiator : 19.0 [kg]
weight exhaust pipes & fuel lines 16.1 [kg]
weight cowling 5.3 [kg]
weight airscrew(s) (wood) incl. boss & bolts : 19.9 [kg]
total weight propulsion system : 300 [kg](21.1 [%])
***************************************************************
fuselage skeleton (wood gauge : 6.51 [cm]): 110 [kg]
bracing : 9.8 [kg]
plywood/wood covering hull (gauche : 1.6 [cm]): 192.9 [kg]
weight controls + indicators: 7.1 [kg]
weight seats : 9.0 [kg]
weight other details, lighting set, etc. : 5.1 [kg]
weight bomb storage : 14.0 [kg]
weight 148 [litre] main fuel tank empty : 14.2 [kg]
weight oxygen/compressed air flasks for high altitude : 11.2 [kg]
weight engine mounts & firewalls : 7 [kg]
total weight fuselage : 380 [kg](26.7 [%])
***************************************************************
weight wing covering (doped linen fabric) : 26 [kg]
total weight ribs (72 ribs) : 84 [kg]
load on front upper spar (clmax) per running metre : 768.0 [N]
load on rear upper spar (vmax) per running metre : 276.4 [N]
total weight 8 spars : 69 [kg]
weight wings : 179 [kg]
weight wing/square meter : 4.48 [kg]
weight 12 interplane struts & cabane : 35.2 [kg]
weight cables (70 [m]) : 8.8 [kg] (= 125 [gram] per metre)
diameter cable : 4.5 [mm]
weight fin & rudder (2.3 [m2]) : 10.8 [kg]
weight stabilizer & elevator (3.8 [m2]): 17.4 [kg]
total weight wing surfaces & bracing : 251 [kg] (17.7 [%])
*******************************************************************
weight machine-gun(s) : 12.7 [kg]
weight pivot mounting mg :6.0 [kg]
weight armament : 19 [kg]
********************************************************************
weight 2 tip floats : 16 [kg] (1.2 [%])
*******************************************************************
Belgian Type H “La Miquette”, piloted by Victor Boin
********************************************************************
calculated empty weight : 966 [kg](68.0 [%])
weight oil for 4.1 hours flying : 8.2 [kg]
weight cooling fluids : 27.3 [kg]
weight 5 drums empty : 1.0 [kg]
weight ammunition (235 rounds) : 7.5 [kg]
weight signal pistol with cartridges : 3.6 [kg]
weight automatic pistol with spare magazines : 1.2 [kg]
*******************************************************************
calculated operational weight empty : 1014 [kg] (71.4 [%])
published operational weight empty : 984 [kg] (69.3 [%])
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weight crew : 243 [kg]
weight (electrical heated) clothing for high altitude : 18.0 [kg]
weight fuel for 2.0 hours flying : 62 [kg]
********************************************************************
operational weight : 1337 [kg](94.2 [%])
bombload could not be carried with fuel for 2 hours flying time
fuel reserve : 60 [kg] enough for 1.91 [hours] flying
possible additional useful load : 23 [kg]
operational weight fully loaded : 1420 [kg] with fuel tank filled for 100 [%]
published maximum take-off weight : 1420 [kg] (100.0 [%])
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calculation : * 4 * (engine power)
power loading (operational without bombload) : 10.10 [kg/kW]
total power : 132.4 [kW] at 1700 [r.p.m]
calculation : *5* (loads)
manoeuvre load : 2.0 [g] at 1000 [m]
limit load : 3.5 [g] ultimate load : 5.2 [g] load factor : 2.1 [g]
design flight time : 2.76 [hours]
design cycles : 362 sorties, design hours : 1000 [hours]
operational wing loading : 328 [N/m^2]
wing stress (3 g) during operation : 220 [N/kg] at 3g emergency manoeuvre
calculation : *6* (angles of attack)
angle of attack zero lift : -1.14 ["]
max. angle of attack (stalling angle) : 11.89 ["]
angle of attack at max. speed : 2.66 ["]
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 : 0.33 [ ]
induced drag coefficient at max. speed : 0.0053 [ ]
drag coefficient at max. speed : 0.0523 [ ]
drag coefficient (zero lift) : 0.0469 [ ]
calculation : *8* (speeds
stalling speed at sea-level (OW): 78 [km/u]
landing speed at sea-level (OW without bombload): 94 [km/hr]
min. drag speed (max endurance) = minimum speed*1.1 at cruise height : 97 [km/hr] at 2438 [m] (power:44 [%])
min. power speed (max range) : 111 [km/hr] at 2438 [m] (power:50 [%])
max. rate of climb speed : 89.1 [km/hr] at sea-level
cruising speed : 130 [km/hr] op 2438 [m] (power:65 [%])
design speed prop : 138 [km/hr]
maximum speed : 145 [km/hr] op 100 [m] (power:99 [%])
climbing speed at sea-level (without bombload) : 195 [m/min]
calculation : *9* (regarding various performances)
take-off distance at sea-level : 148 [m]
lift/drag ratio : 10.52 [ ]
max. practical ceiling : 5550 [m] with flying weight :1098 [kg]
practical ceiling (operational weight) : 4400 [m] with flying weight :1337 [kg] line 3385
practical ceiling fully loaded (mtow- 1 hour fuel) : 4150 [m] with flying weight :1389 [kg]
published ceiling (4876 [m]
climb to 1500m (without bombload) : 8.66 [min]
climb to 3000m (without bombload) : 21.77 [min]
Close up of the HS 8A engine ©bvdz
max. dive speed : 366.7 [km/hr] at 3150 [m] height
load factor at max. angle turn 1.95 ["g"]
turn radius at 500m: 58 [m]
time needed for 360* turn 11.9 [seconds] at 500m
calculation *10* (action radius & endurance)
operational endurance : 4.58 [hours] with 3 crew and 20 [kg] useful load and 117.1 [%] fuel
published endurance : 3.45 [hours] with 3 crew and possible useful (bomb) load : 55 [kg] and 88.1 [%] fuel
action radius : 299 [km] with 3 crew and 20[kg] photo camera or bombload
max range theoretically with additional fuel tanks for total 460 [litre] fuel : 1411 [km]
useful load with action-radius 250km : 218 [kg]
production : 28.42 [tonkm/hour]
oil and fuel consumption per tonkm : 1.17 [kg]
_
-°_I /
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Literature :
Warplanes WWI page 152t, 153d
Praktisch handboek vliegtuigen deel 1 page 139
Bombers 1914-19 page 168
© bvdz
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 29 February 2020 contact : info.aircraftinvestigation@gmail.com python 3.7.4