O.Thetford, P.Gray German Aircraft of the First World War (Putnam)

Brandenburg GW
  Developed as a torpedo strike aircraft during 1916, a total of twenty-six aircraft were supplied to the German Navy. The prototype had triple vertical tail surfaces, but the production machines had a simplified empennage. In production aircraft the frontal radiators of the prototype were re-located in the wings, and flush. The GW was capable of carrying a torpedo weighing 725 kg. (1,595 lb.), and chiefly operated from the seaplane station at Angernsee in Courland. Engines, two 160 h.p. Mercedes D III. Span, 21.56 m. (70ft.8 7/8in.). Length, 12.57m.(41 ft. 3in.). Height, 4.145 m. (13 ft. 7 1/8 in.). Area, 102.14 sq.m. (1,103 sq.ft.). Weights: Empty, 2,334 kg. (5,135 lb.). Loaded, 3,928 kg. (9,506 lb.). Speed, 102.14 km.hr. (64 m.p.h.). Climb, 1,000 m. (3,280 ft.) in 22 min. Armament, one torpedo, one defensive Parabellum machine-gun.


Brandenburg GDW
  With enlarged proportions, this 1916 machine was a development of the GW and was designed to carry a heavier torpedo weighing 1,825 kg. (4,015 lb.). Only a single aircraft was built (No. 746), and it was probably seconded to training duties. Engines, two 200 h.p. Benz Bz IV. Span, 24.5 m. (80 ft. 4 5/8 in.). Length, 15.8 m. (51 ft. 10 1/8 in.). Height, 5.0 m. (16 ft. 4 in.). Area, 134 sq.m. (1,447 sq.ft.). Weights: Empty, 2,936 kg. (6,459 lb.). Loaded, 4,851 kg. (10,672 lb.). Speed, 130 km.hr. (81.25 m.p.h.). Climb, 1,000 m. (3,280 ft.) in 19.5 min.

C.Owers Hansa-Brandenburg Aircraft of WWI Vol.2: Biplane Seaplanes (A Centennial Perspective on Great War Airplanes 18)

Type GW
  
  According to Heinkel, the GW floatplane was based on the twin-engined GF bomber. The family development is readily seen in the appearance of the machine. This large floatplane was developed during 1916 to carry a 725-kg torpedo, hence T Class. The prototype, MN 528, had triple vertical tail surfaces but this was simplified on production machines. The drag-inducing frontal radiators of the prototype were replaced by flush-mounted aerofoil radiators on the rest of the batch of floatplanes. Heinkel states it was the first time that a machine carried starting devices for the engines.(35) One defensive Parabellum machine gun was provided. The prototype passed its tests in January 1916 at Warnemunde. The German Navy ordered a further 20 of these aircraft after successful testing of the prototype.
  The twin Mercedes engines were mounted in nacelles between the wings on each sides of the fuselage. The rudder was balanced being above the fin and below the fuselage. A large triangular fin was mounted atop the fuselage. The twin floats were mounted directly below each engine nacelle. A single machine gun was provided for defence.
  The first two batches of five machines each were delivered between April and August 1916. The production examples were mainly operated from Lake Engure,(36) Angernsee seaplane station in Courland, Latvia, against Russian targets. The German army had captured large areas of the Russian Empire in 1915. The seaplane base established at Angernsee was to enable the Germans to carry out reconnaissance and aerial operations against the Russian forces on the Eastern and Southern sides of the Gulf of Riga. The lake was an excellent place from which to operate seaplanes and a nearby airfield allowed for the use of landplanes as well, Fokker Eindecker monoplanes operating from here in defence of the station. In July 1916 the 1st Torpedo-Staffel began to establish itself at the station with a single Friedrichshafen FF33H and four Brandenburg GW floatplanes. The Brandenburgs were numbered T1 to T4 and these numbers were carried on their fuselage.
  T3 (MN 648) was damaged during a Russian air raid on 16/17 August. Its tail was damaged when a Russian bomb blew the hangar door in. T1 and T4(37) also sustained slight shrapnel damage during this attack.
  Apparently the GW floatplanes were not well received as it was reported back to the test command that it took over an hour to reach cruising altitude.
  Although each batch was different they were all designated Type GW and were duly recorded as such in the SVK drawings. The prototype had triple rudders. MNs 700 - 704 had a more rounded nose and a single rudder. This batch was constructed between September 1916 and January 1917. MNs 1080 - 1084 had short noses and were constructed between September and November 1917. They saw service from Zeebrugge and other North Sea bases.
  The kuk Kriegsmarine received a single GW (MN 701) in late November 1917 that received the Austro-Hungarian serial T1 (T2 and T3 were Gotha WD.14 biplanes).

(35) Various writers have noted that Heinkel had a habit of claiming the "first" for many innovations.
(36) Also spelt Angern. This section has been written mainly from "The Battle of Angernsee", by A. Alexandrov and R. Kintner, Over the Front Journal, US, Vol.18, No.4, 2003, P.292.
(37) T4 was MN 649.


Brandenburg GW Production
Marine Numbers Class Delivered Notes
528 T Jan. 1916 Prototype. Triple rudders.
620 - 624 TMG Aug. - Oct. 1916 Machine gun provided for defence. Revised tailplane, triple rudders.
646 - 650 TMG Apr. - July 1916 Transition between triple & single rudders in this batch.
700 - 704 T Nov.1916 - Mar.1917 Single rudder. Gunner to rear. 701 to Austro-Hungarian Navy.
1080 - 1084 T Sept. - Nov.1917 Revised tailplane, balanced elevators.


Brandenburg GW Specifications
Source Typenschau Gray & Thetford Brandenburg 3-View GW IV Serie SVK MN 620 (620 - 624) SVK MN 647 (646 - 650) SVK MN 700 (700 - 704) SVK MN 1083 (1080 - 1084)
Dimensions in m
Span, Upper 21.56 21.56 21.560 21.000 21.000 21.000 21.560
Span, Lower 21.56 21.56 21.560 21.000 21.000 21.000 21.560
Length 11.74 11.74 11.700 11.700 11.740 11.900
Chord, Upper 2.56 - 2.560 2.400 2.400 2.500 2.560
Chord, Lower 2.56 - 2.560 2.400 2.400 2.500 2.560
Areas in m2
Wings 103.40 103.4 - - - - -
Ailerons 6.0 - - - - - -
Elevators 2.5 - - - - - -
Rudder 2.13 - - - - - -
Weights in kg
Empty 2,374 2,374 2,334 2,399 2,315 2,361 2,374
Loaded 3,856 3,856 3,928 3,590 3,741 3,787 3,856
Performance
Speed in km/hr 127.5 127.5 - - - - -
Time to 500 m - - - 9.9 min. 10.5 min. 9 min. 11.7 min.
Time to 800 m 20.9 min. 20.9 min. - 17.5 min. 21 min. 14.5 min. 20.8 min.
Time to 1000 m 29.1 min. 29.1 min. 22 min. 26 min. 30 min. 19.9 min. 29.4 min.
Time to 1500 m - - - 53.5 min. 60.5 min. 34 min. -
Motor 160-hp Mercedes 160-hp Mercedes D.III 160-hp Mercedes 195-hp 195-hp 160-hp 160-hp Mercedes



Type GDW
  
  As the designation shows, the Class T floatplane GDW was a development of the GW designed to carry the heavier 825-kg torpedo, the extra power being supplied by a pair of 220-hp Benz engines. Only a single aircraft, MN 746, was built. The prototype was modified after its acceptance by the SVK as photographs show that the rudder was now an inverted L shape and did not extend below the fuselage. A large triangular fin was fitted. The elevators were now balanced and in two pieces. The SVK drawing shows MN 746 with plain elevators and a large rudder with balance surfaces above and below the fuselage. The machine must have been modified after initial testing. Again a single machine gun provided defence. The pilot and gunner were both situated towards the wing trailing edge, in close proximity for communication. The pilot would have had little view above due to being situated almost completely below the upper wing. The wings were constructed in seven sections, the outer panels being swept back from the engine nacelles.
  It is thought the GDW was utilized for training as no further development took place. Production of such large aircraft in small numbers was typical of the times. Aircraft were constantly evolving and the skilled factory workers could produce a prototype in a relatively short time. Until a machine had flown there was no way of knowing if the design would perform as predicted by the aeronautical engineering science of the day.

Brandenburg GDW Specifications
Source Typenschau Gray & Thetford SVK MN 746
Dimensions in m
Span, Upper 24.30 24.5 24.500
Span, Lower 24.30 - 24.500
Length 9.50 9.5 9.500
Height - 5.0 5.000
Chord, Upper 2.935 - 2.935
Chord, Lower 2.935 - 2.935
Areas in m2
Wings 134.00 134 -
Ailerons 9.0 - -
Elevators 3.40 - -
Rudder 2.85 - -
Empty Wt., kg 2,950 2,936 -
Loaded Wt., kg 4,865 4,851
Performance
Speed in km/hr 130 130 -
Time to 800 m 13.5 min. - -
Time to 1000 m 17.5 min. 19.5 min. -
Time to 1500 m 29.0 min. - -
Time to 2000 m 45.0 min. - -
Motor 220-hp Benz 200-hp Benz Bz.IV 200-hp Benz

E.Hauke, W.Schroeder, B.Totschinger Die Flugzeuge der k.u.k. Luftfahrtruppe und Seeflieger 1914-1918

Kampfflugboote
T 1 Brandenburg GW Dt. Marinenummer 701 2 x Merc 160