Dornier Do J. "Wal"

c250 produced.

Development

The Do J had a high-mounted strut-braced parasol wing with two piston engines mounted in tandem in a central nacelle above the wing; one engine drove a tractor and the other drove a pusher propeller. The hull made use of Claudius Dornier's patented sponsons on the hull's sides, first pioneered with the earlier, Dornier-designed Zeppelin-Lindau Rs.IV flying boat late in World War I.[1][2] The Do J made its maiden flight on 6 November 1922. The flight, as well as most production until 1932, took place in Italy because of the restrictions on aviation in Germany after World War I under the terms of the Treaty of Versailles. Dornier began to produce the Wal in Germany in 1931; production went on until 1936. In the military version (Militärwal in German),[3] a crew of two to four rode in an open cockpit near the nose of the hull. There was one machine gun position in the bow in front of the cockpit and one or two amidships. Beginning with Spain, military versions were delivered to Argentina, Chile and the Netherlands for use in their colonies; examples were also sent to Yugoslavia, the Soviet Union and to the end of production Italy and Germany. The main military users, Spain and the Netherlands, manufactured their own versions under licence. Several countries, notably Italy, Norway, Portugal, Uruguay and Germany, employed the Wal for military tasks. The civil version (Kabinenwal or Verkehrswal) [3] had a cabin in the nose, offering space for up to 12 passengers, while the open cockpit was moved further aft. Main users of this version were Germany, Italy, Brazil and Colombia. The Do J was first powered by two 265 kW (355 hp) Rolls-Royce Eagle IX engines. Later versions used nearly every available engine on the market from makers like Hispano-Suiza, Napier & Son, Lorraine-Dietrich, BMW, and even the US-built Liberty V-12 engine. The 10 to-Wal used by Deutsche Lufthansa for their mail service across the South Atlantic from 1934 to 1938 had a range of 3,600 km (2,200 mi), and a ceiling of 3,500 m (11,480 ft). Over 250 Wals were built by CMASA and Piaggio in Italy, CASA in Spain, Kawasaki in Japan, Aviolanda in the Netherlands and Dornier in Germany. Numerous airlines operated Wals on scheduled passenger and mail services with great success. The source Robert L. Gandt, in 1991,[4] (pages 47–48) lists the following carriers: SANA and Aero Espresso of Italy; Aero Lloyd and Deutsche Luft Hansa of Germany; SCADTA of Colombia; Syndicato Condor of Brazil; Nihon Koku Yuso Kaisha of Japan. According to Nicolaou, 1996 [5] the Dornier Wal was "easily the greatest commercial success in the history of marine aviation". The Colombian Air Force used Wals in the Colombia–Peru War in 1932–1933. N-24 landed on the ice at Ny Ålesund Amundsen's Dornier Do J flying over the Oslofjord, 1925 A Wal at Slite, Gotland, on the Danzig-Stockholm route in 1925 The Dornier Do 18 was a completely updated successor to the Wal but shared little more than the general configuration.

A record-Setter

The Norwegian polar explorer Roald Amundsen accompanied by Lincoln Ellsworth, pilot Hjalmar Riiser-Larsen, and three other team members used two Dornier seaplanes in his unsuccessful attempt to reach the North Pole in 1925. His two aircraft, N-24 and N-25, landed at 87° 44' north. It was the northernmost latitude reached by any aircraft up to that time. The planes landed a few miles apart without radio contact, yet the crews managed to reunite. One of the aircraft, the N-24, was damaged. Amundsen and his crew worked for over three weeks to prepare an airstrip to take off from the ice. They shoveled 600 tons of ice while consuming only one pound (454 g) of daily food rations. In the end, six crew members were packed into the N-25. Riiser-Larsen took off, and they barely became airborne over the cracking ice. They returned triumphantly after widely being presumed dead. Replica Dornier Wal N25 in the Dornier Museum Friedrichshafen On 18 August 1930, Wolfgang von Gronau started on a transatlantic flight in the same Dornier Wal (D-1422) Amundsen had flown, establishing the northern air route over the Atlantic, flying from Sylt (Germany)-Iceland-Greenland-Labrador-New York 4,670 mi (7,520 km)) in 47 flight hours. In 1932 von Gronau flew a Dornier Wal (D-2053) called the "Grönland Wal" (Greenland Whale) on a round-the-world flight. In 1926 the captain Ramón Franco became a national Spanish hero when he piloted the Plus Ultra on a trans-Atlantic flight, following the route pioneered by Portuguese aviators Sacadura Cabral and Gago Coutinho in the first flight across the South Atlantic in 1922. His co-pilot was Julio Ruiz de Alda Miqueleiz; the other crew members were Teniente de Navio (Navy Lieutenant) Juan Manuel Duran and the mechanic Pablo Rada. The Plus Ultra departed from Palos de la Frontera, in the Province of Huelva, Spain, on 22 January and arrived in Buenos Aires, Argentina, on 26 January. It stopped over at Gran Canaria, Cape Verde, Pernambuco, Rio de Janeiro and Montevideo. The 10,270 km journey was completed in 59 hours and 39 minutes. The event appeared in most major newspapers worldwide, although some of them underlined the fact that the airplane itself, plus the technical expertise were foreign. Throughout the Spanish-speaking world, the Spanish aviators were wildly acclaimed, particularly in Argentina and Spain where thousands gathered at Plaza de Colón in Madrid. In 1929 Franco attempted another trans-Atlantic flight, this time crashing the airplane in the sea near the Azores. The crew was rescued days later by the aircraft carrier HMS Eagle of the British Royal Navy. The Portuguese military aviator major Sarmento de Beires and his crew (captain Jorge de Castilho as navigator and lieutenant Manuel Gouveia as flight engineer) made the first aerial crossing of the Atlantic Ocean by night in a Dornier J named Argos. The crossing was made on the night of the 16 to 17 March 1927, from the Bijagós Archipelago in Portuguese Guinea to Fernando de Noronha island in Brazil. Two Dornier Wals (D-ALOX Passat and D-AKER Boreas) also played an important role in the Third German Antarctic Expedition of 1939.

South Atlantic Air Mail

South Atlantic air mail A Luft Hansa Dornier Do J II f Bos, registered D-AFAR and named Samum in Bathurst (1938)

The biggest and last versions of the Wal, the eight and ten tonne variants (both versions also known as Katapultwal [3] ), were operated by Lufthansa on their South Atlantic airmail service from Stuttgart, Germany to Natal, Brazil.[6] On route proving flights in 1933, and a scheduled service beginning in February 1934, Wals flew the trans-ocean stage of the route, between Bathurst, the Gambia in West Africa and Fernando de Noronha, an island group off South America. At first, there was a refueling stop in mid-ocean. The flying boat would land on the open sea, near a converted merchant ship. This vessel was equipped with a "towed sail" onto which the aircraft taxied. From there it was winched aboard by a crane, refueled, and then launched by catapult back into the air. However, landing on the big ocean swells tended to damage the hull of the flying boats, especially the smaller 8-tonne Wal.

From September 1934 a second merchantman was available, so that Lufthansa now had a support ship at each end of the trans-ocean stage, providing radio navigation signals and catapult launchings. When they did not have to take off from the water under their own power, the flying boats could carry more fuel. Once the incoming mail from Europe had arrived in West Africa (also by Wal from the Canary Islands), the support ship would steam out to sea in the direction of South America for 36 hours before using its catapult to launch the airplane. On the return trip a Wal would fly the stage from Natal to Fernando de Noronha, and then be carried out to sea overnight. The same airplane was then catapulted off to fly to West Africa the following morning, i.e., after twelve hours travel on the ship. From April 1935 the ships no longer carried the flying boats out to sea. The Wal was launched offshore, and flew the entire distance across the ocean. This cut the time it took for mail to get from Germany to Brazil from four days down to three.

The first ship converted to a mid-Atlantic refueling stop was the SS Westfalen, a freight and passenger liner that became out-dated for carrying mail and passengers shortly after World War I due to its small size and low cruising speed. The second vessel was the MS Schwabenland. In 1936 a new support ship went into service, the MS Ostmark, which Lufthansa had purpose-built as a seaplane tender. Wals made over 300 crossings of the South Atlantic in regular mail service (Gandt, 1991, pages 47–48).[4] The 8-tonne Wal was not a success, only two being built. The six 10-tonne Wals flew the South Atlantic from 1934 until late 1938, although aircraft of more recent design began replacing them from 1937.

From 1925 the French airline Compagnie Générale Aéropostale operated an airmail service on much the same route, from France to Brazil. The mail was flown only as far as Dakar in Senegal, West Africa, and then shipped across the South Atlantic to Natal aboard converted destroyers. The ocean crossing alone took five days, the whole trip eight days. From 1930 Aéropostale began trying to make the ocean crossing by air, but kept losing planes and crews and suffered from a lack of political support. Air France, of which Aéropostale had become a part, only began operating an all air service between Europe and South America in January 1936,[7] nearly two years after Lufthansa. That the Germans had succeeded in establishing the world's first regular intercontinental airline service before their competition was due, in no small part, to the sturdy and seaworthy Wal and its reliable BMW engines. (This section is based on "Graue & Duggan",[8][page needed] Gandt[4][page needed] and Nicolaou.[5][page needed])

Variants

Do J Kas Wal: Hispano-Suiza engines. Transport and military flying boat.
Do J Wal: Rolls-Royce Eagle IX engines. Transport and military. Argentina, Chile, Soviet Union.
Do J Wal (Kestrel): Rolls-Royce Kestrel engines variant, transport/military. Yugoslavian Navy.
Do J Wal (Lorraine): Lorraine-Dietrich engines, Transport/military: Dutch KNIL
Do J Wal (Renault): Test variant with Renault engines
Do J Wal (Farman): Prototype with Farman 12Wer engines.
Do J Wal (Napier): Same with Napier Lion V engines
Do J Wal (Eagle): Civilian variant with Rolls-Royce Eagle engines.
Do J Wal (Isotta): Test variant for the RM, with Isotta-Fraschini Asso
Do J Wal (Fiat): Same with Fiat A.22 R engines.
Do J Gas Wal: Variant with Gnôme-Rhöne Jupiter engines.
Do J Bas Wal: Variant with BMW VI engines
Do J II Wal: Production version with BMW VI engines
Do J II Wal (Siemens): Same with Siemens Jupiter engines
Do J II Bas Wal: Passenger variant with BMW VI engines.
Do J IIa Bos Wal: Post carrying model with BMW VI engines.
Do J IIaK Bos Wal: Catapulted launched variant for Atlantic crossings, with BMW VI engines.
Do J IIb Bos "Grönland" Wal: Polar variant with BMW VIIa engines.
Do J II Ses Wal: Siemens Sh 20 engines variant
Do J IId Bis Wal: BMW VI engines.
Do J IId Bis Wal: Curtiss Conqueror variant exported To Colombia
Do J II 16a Bis Wal: BMW VI engines, in service with the Reichsmarine as Dornier Do 16
Do J IId Militär-Wal with BMW VI engines.
Do J IIe 16 Bos Wal with BMW VI engines
Do J IIf Bos Wal with BMW VI U engines
Do O Wal "Atlantico"/"Pacifico" c/n 34/35 (CMASA Italy). 1924 Expedition to South America. Shipped to and assembled on the island of Curaçao and sold to Sindicato Condor and later to Varig, used until 1936.

Exports

Argentine Naval Aviation

Brazil: Varig, Syndicato Condor

Chile: Air Force/Navy

Colombia: SCADTA; Colombian Air Force

Denmark Royal Danish Navy

Germany, Condor Syndikat, Deutscher Aero Lloyd, Deutsche Luft Hansa

Italy Aero Espresso Italiana - Società Anonima Navigazione Aerea

Japan

Netherlands: Netherlands Naval Aviation Service[16]

Norway

Portugal Portuguese Air Force

Soviet Union Soviet Air Force

Spain: LAPE, Spanish Republican Air Force, Spanish Republican Navy, Spanish Air Force, Spanish Navy

Switzerland:

Kingdom of Yugoslavia, Yugoslav Royal Navy

Specifications Dornier Do.J
Crew:	3, Up to 10 passengers
Dimensions	17.25 x 22 x 5.62 m (56 ft 7 in x 72 ft 2 in x 18 ft 5 in)
Wingspan
Wing area	96 m2 (1,030 sq ft)
Wing loading
Power/mass
Height
Empty weight	3,630 kg (8,003 lb)
Max TO Weight	7,000 kg (15,432 lb)
Propulsion	2× RR Eagle IX V-12 WC piston engines, 265 kW (355 hp) each
Propeller
Top speed	185 km/h (115 mph, 100 kn)
Cruise speed	145 km/h (90 mph, 78 kn)
Service ceiling	3,500 m (11,500 ft)
Rate of climb	1.5 m/s (300 ft/min), 3,000 m (9,843 ft) in 33 minutes
Range	800 km (500 mi, 430 nmi)
Ferry range
Gun Armament
Armament underwing