The Blohm & Voss Ha 139 was a German all metal inverted gull wing floatplane.
With its four engines it was at the time one of the largest float equipped seaplanes that had been built.
The inboard engines were mounted at the joint between the inboard anhedral and outboard dihedral wing sections, above the pylon mounted floats.
Further development of the Ha 139 led to the land-based version Blohm & Voss BV 142 which had its first flight in October 1938.
The aircraft were flown by Deutsche Luft Hansa on transatlantic routes between 1937 and 1939, predominantly between Bathurst, Gambia, Natal & Brazil.
Catapult launched from an aircraft tender they were able to transport 500 kg of mail over a distance of up to 5,000 km.
On the outbreak of World War II, the planes were transferred to the Luftwaffe and used for transport, reconnaissance and minesweeping work over the Baltic Sea.
They were not particularly suited for military use.
Variants
Projekt 15
Catapult launched floatplane mail-carrier design for Deutsche Lufthansa (DLH), became the Ha 139.
Projekt 20
A reconnaissance-bomber derivative of Projekt 15 submitted to the Reichsluftfahrtministerium (RLM) (German air Ministry) but generating little interest.
Ha 139 V1 Nordwind
First of two baseline prototypes
Ha 139 V2 Nordmeer
Second of two baseline prototypes
Ha 139 V3 Nordstern
Third prototype with longer wingspan, increased wing area and modified engine mounts.
Ha 139B
The Ha 139 V3 re-designated when in service with DLH.
Ha 139B Umbau
After service with DLH, the Ha 139B was modified as the Ha 139B Umbau with an extended glazed nose accommodating a navigator and a spherical Ikaria mount for a machine gun.
Further machine guns were mounted in the cockpit roof hatch and in lateral mountings on either side of the rear fuselage.
Ha 139B/MS
The Ha 139B/Umbau was later modified into a minesweeping aircraft fitted with a large magnetic sensing loop strung between the nose, floats, wing tips, and tail unit.
Specifications
(Ha 139B)
Crew
4-5
Length
20.07 m (65 ft 10 in)
Wingspan
29.5 m (96 ft 9 in)
Height
4.8 m (15 ft 9 in)
Wing area
130 m2 (1,400 sq ft)
Empty weight
10,340 kg (22,796 lb)
Gross weight
19,000 kg (41,888 lb)
Powerplant
4 × Junkers Jumo 205C,
6 cylinder opposed piston diesel engines,
447 kW (599 hp) each for take-off
Propellers
3 bladed variable pitch metal propellers
Performance
Maximum speed
288 km/h (179 mph, 156 kn) at 3,000 m (9,843 ft)
Cruise speed
238 km/h (148 mph, 129 kn) (maximum) at 2,000 m (6,562 ft)
Economical cruise speed
200 km/h (124 mph)
Ferry range
4,600 km (2,900 mi, 2,500 nmi) at 238 km/h (148 mph)
4,950 km (3,076 mi) at 200 km/h (124 mph)
Rate of climb
2.833 m/s (557.7 ft/min)
Armament
Guns
4 x 7.92 mm (0.312 in) MG 15 machine guns in nose,
