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The Blohm & Voss BV 138 Seedrache (Sea Dragon), but nicknamed Der Fliegende Holzschuh ("flying clog",[1] from the side-view shape of its fuselage, as well as a play on the title of the Wagner opera 'Der Fliegende Hollander' or 'The Flying Dutchman') was a World War II German trimotor flying boat that served as the Luftwaffe's main seaborne long-range maritime patrol and naval reconnaissance aircraft.

BV 138B
An image of a BV 138 published in a British Aircraft guide.
Role	Maritime patrol Long-Range Reconnaissance Type of aircraft
Manufacturer	Blohm & Voss
Designer	Richard Vogt
First flight	15 July, 1937
Introduction	October, 1940
Primary user	Luftwaffe
Produced	1938–1943
Number built	297

A total of 297 BV 138s were built between 1938 and 1943.

Design and development

Originally developed under the company name of Hamburger Flugzeugbau, the type was initially designated the Ha 138. Its appearance was unique in its combination of unusual design features with its twin boom tail unit, short fuselage and trimotor engine configuration. The short hull, with its hydrodynamic step beneath and flat sides, earned it the nickname, "Fliegender Holzschuh" (the flying clog). The booms of the twin tail unit, much like the smaller Focke-Wulf Fw 189 twin-engined reconnaissance monoplane, extended horizontally from the rear of the outer engine nacelles. For hydrodynamic reasons, the hull featured a distinct "turn-down", or "beak" at the stern.

The first prototype featured a gull wing, but during the first flight it was discoverd that this wing could not generate enough lift, so the concept was abandoned on the second prototype.

The airplanes had also a hardpoint for catapult lauches from seaplane tenders.

Three piston engines were used. The central engine was mounted above the wing, while the wing engines were lower. The pre-production prototypes and the BV 138 A-01 to BV 138 A-06, were powered by various makes of engines ranging from 485–746 kW (650–1,000 hp). The first standardized version, BV 138 B-1, was powered by three 880 PS (868 hp, 647 kW) Junkers Jumo 205D two-stroke, opposed-piston aircraft diesel engines. The engine cowlings also had an atypical appearance, due to the unique nature of the vertical orientation of the six-cylinder opposed-piston Jumo 205 diesel engines, and resembled the cowlings of 4 or 6-cylinder inverted inline engines found on smaller civil and utility aircraft from the Jumo 205's propshaft placement, emerging forward at the uppermost front end of the powerplant. The choice for diesel engines made it possible to refuel on sea from U-boats, who also run on diesel engines. When refuelling at sea, the airplane had to be fitted with a fuel filter as diesel fuel from ships contains some condensation.

There were 3 gun positions on the aircraft : there was one on the bow with an enclosed, powered gun turret with a single MG 151/20 autocannon. On the stern the fields of fire were obstructed by the tail with the horizontal stabilizer, so there was one gun position on the fuselage and one just behind the central engine. The gun position behind the central engine was a fully open Scarff ring-like emplacement which could mount a 7.92 mm MG 15 machine gun, but most aircraft mounted a 13 mm MG 131 heavy machine gun. Only in early aircraft was the gun position at the rear fuselage left open and equiped with a machine gun, most aircraft mounted a similar turret as the one on the bow.

Operational history

During the invasion of Norway in April 1940, some of the pre-production aircraft were pressed into service as troop transporter.

The main variant, BV 138 C-1, began service in March 1941.

Notable Operations

In preparation of a repeat of Operation Wunderland in 1943, the U-Boat U-255 was sent to the East coast of Novaja Zemlya where it teamed up with a BV 138. The U-255 refuelled the BV 138 four times for a reconnaissance flight over the Kara Sea, up to the Wilkiz street. The BV 138 could not find any shipping however, that would make a mission for the German cruiser Lützow worthwile, so the operation was cancelled.[2]

Modifications

The BV 138 was tested with the Walter HWK 109-500 Starthilfe RATO jettisonable rocket pod, used in pairs, for shorter takeoff performance.[3]

For reconnaisance over sea, some aircraft carried FuG 200 Hohentwiel low-UHF band maritime search radar.

Some examples of the BV 138 were adapted to specialized roles :

• The BV 138 MS variant was converted for minesweeping,[4] and carried magnetic field-generating degaussing equipment, including a hoop antenna with a diameter equal to the length of the fuselage, which encircled the hull and wings, which was also used on certain models of the Ju 52/3m trimotor transport used for the same duty.
• Some BV 138s served with the specialist KG200, carrying 10 fully armed infantry troops instead of a bombload.

Variants

Ha 138 V1 (D-ARAK)

First prototype, developed under Hamburger Flugzeugbau designation. First flight on 15 July 1937.

Ha 138 V2 (D-AMOR)

Second prototype, developed under Hamburger Flugzeugbau designation. First flight in August 1937.

Ha 138 V3

Third prototype, developed under Hamburger Flugzeugbau designation. Construction abandoned due to redesign.

BV 138 A-01 to 06

Operational testbeds ; 6 build.

BV 138 A-1

First serial production, 25 build. Standard engine is the 605 PS Junkers Jumo 205 C.

BV 138 B-0

Officially entered service in October 1940 ; 10 build.

BV 138 B-1

Entered service in November 1940 ; 21 build. Engines are upgraded to 880 PS (868 hp, 647 kW) Junkers Jumo 205D two-stroke, opposed-piston aircraft diesel engines.

BV 138 C-1

From this version on, the central motor was fitted with a four-blade propeller, while the wing engines kept a three-blade propeller, but the blades were reinforced and wider ; 227 build.

BV 138 MS

Minensuch (mine-search) minesweeping version ; all MS variants were converted from existing aircraft and had their armament removed ; the turrets and gun positions were covered.

Many German aircraft had Umbau sets available for modifications in the field. For the BV 138 there was an Umbau set for adding a bomb rack under the port wing. With such an Umbau the bomb payload could be doubled.[5]^{[unreliable source?]} As per German nomenclature, such aircraft held a suffix '/U'. A BV 138 C-1 aircraft with the Umbau modification would become BV 138 C-1/U1.

Surviving aircraft

No complete BV 138s remain in existence. However, the wreck of one aircraft, sunk after the war in a British air show, was raised from the seabed of the Øresund Sound in 2000, and is on display at the Danish Technical Museum in Helsingør.^{[citation needed]}

In June 2013, a vessel from the Norwegian Geological Survey filmed a Blohm & Voss BV 138 at a depth of 35 m in Porsangerfjorden, Norway, not far from the WWII German seaplane harbour in Indre Billefjord.[6]

Another wreckage of a BV 138 was identified by the Norwegian Mapping and Cadastre Authority on the seabed near Svalbard in 2022.[7]

Specifications (BV 138 C-1)

Data from Aircraft of the Third Reich : Volume One[8]

General characteristics

• Crew: 6 (pilot, navigator, radio operator, nose-gunner, rear-gunner, upper-rear gunner)
• Capacity: up to 10 passengers
• Length: 19.85 m (65 ft 1 in)
• Wingspan: 26.94 m (88 ft 5 in)
• Height: 5.9 m (19 ft 4 in)
• Wing area: 112 m² (1,210 sq ft)
• Empty weight: 11,770 kg (25,948 lb)
• Gross weight: 14,500 kg (31,967 lb)
• Max takeoff weight: 17,650 kg (38,912 lb)
• Fuel capacity: 3,750 l (990 US gal; 820 imp gal) maximum internal fuel
• Powerplant: 3 × Junkers Jumo 205D 6-cylinder liqiuid-cooled opposed piston diesel engines, 647 kW (868 hp) each for take-off
• Propellers: 3-bladed constant-speed propellers

Performance

• Maximum speed: 285 km/h (177 mph, 154 kn) at sea level at 14,000 kg (30,865 lb) at sea level
• Cruise speed: 235 km/h (146 mph, 127 kn) at 1,000 m (3,281 ft)
• Range: 1,220 km (760 mi, 660 nmi) at 195 km/h (121 mph; 105 kn)
• Ferry range: 4,300 km (2,700 mi, 2,300 nmi) with max fuel
• Endurance: 6 hours 30 minutes normal; 18 hours maximum
• Service ceiling: 5,000 m (16,000 ft) at 14,500 kg (31,967 lb)

2,800 m (9,186 ft) at 17,650 kg (38,912 lb)

• Rate of climb: 3.67 m/s (722 ft/min)
• Time to altitude: 3,170 m (10,400 ft) in 24 minutes
• Wing loading: 114.2 kg/m² (23.4 lb/sq ft)
• Power/mass: 0.106 kW/kg (0.064 hp/lb)

Armament

• Guns:
  

• 2 × 20 mm (0.787 in) MG 151 cannon, one in a nose turret and one in the rear fuselage covering upper rear area
• 1 × 13 mm (0.512 in) MG 131 machine gun in open position behind the central engine, covering the top rear area
• 1–3 × 7.92 mm (0.312 in) MG 15 machine guns (optional)

• Bombs: :* up to 3 × 50 kg (110.2 lb) bombs or 2 × 150 kg (330.7 lb) depth charges under starboard wing root, and with the Umbau set, the same payload could be attached to the port wing as well.

See also

Aircraft of comparable role, configuration, and era

• CANT Z.506
• Consolidated PBY Catalina
• Dornier Do 18
• Kawanishi H6K
• Short Sunderland

Related lists

• List of aircraft of World War II
• List of military aircraft of Germany

References

Notes

Bibliography

• Green, William. Warplanes of the Second World War, Volume Five: Flying Boats. London: Macdonald & Co.(Publishers) Ltd., 5th impression 1972. ISBN 0-356-01449-5.
• Green, William. Warplanes of the Third Reich. London: Macdonald and Jane's Publishers Ltd., 4th impression 1979. ISBN 0-356-02382-6.
• Ledwoch, Janusz. Bv 138 (Wydawnictwo Militaria 64) (in Polish). Warszaw, Poland: Wydawnictwo Militaria, 1998. ISBN 83-7219-015-1.
• Nowarra, Heinz J. and Don Cox, (transl.) Blohm & Voss Bv 138 (Schiffer Military History). Atglen, Pennsylvania: Schiffer Publishing Ltd., 1997. ISBN 0-7643-0296-5.
• Smith J. Richard and Anthony Kay. German Aircraft of the Second World War. London: Putnam & Company Ltd., 1972 (3rd impression 1978). ISBN 0-370-00024-2.
• Wagner, Ray and Nowarra, Heinz. German Combat Planes: A Comprehensive Survey and History of the Development of German Military Aircraft from 1914 to 1945. New York: Doubleday, 1971.
• Wixey, Ken (July–August 1999). "Flugboots from Hamburg: An Outline History of Blohm und Voss Flying-boats". Air Enthusiast (82): 42–48. ISSN 0143-5450.

External links

• Article on a BV 138 which sank near Trondheim in Norway
• Website dedicated to the BV 138
• Specs
• German plane wrecks in Norway, WWII

На других языках

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[de] Blohm & Voss BV 138

Die Blohm & Voss BV 138 war ein erfolgreicher See-Fernaufklärer der Luftwaffe, mit dem mehrere Seeaufklärungsstaffeln ausgerüstet waren. Wegen der Form seines Rumpfes erhielt das Flugboot den Spitznamen „Fliegender Holzschuh“, den eine Einheit, die 1.(F)/130(See), sogar zu ihrem Staffelabzeichen machte.

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- [en] Blohm & Voss BV 138

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[fr] Blohm & Voss BV 138

Le Blohm & Voss BV 138 Seedrache est un hydravion de reconnaissance maritime lointaine allemand. Il était le principal appareil de reconnaissance maritime de la Luftwaffe pendant la Seconde Guerre mondiale.

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[it] Blohm & Voss BV 138

Il Blohm & Voss BV 138 era un idroricognitore trimotore a scafo centrale prodotto dall'azienda tedesca Blohm und Voss GmbH dalla fine degli anni trenta ed utilizzato dalla Luftwaffe durante la seconda guerra mondiale.

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[ru] Blohm & Voss BV 138

Blohm & Voss BV.138 «Seedrache» (рус. Морской Дракон) — немецкий дальний гидросамолёт-разведчик времён Второй мировой войны. У союзников получил прозвища «селедка» и «башмак» за характерную внешность. В СССР был известен под названием «Гамбург-138»[1].

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