Focke-Wulf A 20

Focke-Wulf A 20 hawk
Type:	Light airliner
Design country:	German Empire
Manufacturer:	Focke-Wulf
First flight:	1927
Production time:	1927-1929
Number of pieces:	4th

The Focke-Wulf A 20 Habicht is a commercial aircraft built by Focke-Wulf-Flugzeugbau AG in Bremen from the second half of the 1920s.

development

The A 20 was developed as an enlarged successor to the A 16d . Two copies with the serial numbers 34 and 53 were built in 1927/1928. Both were registered in February and July 1928 and were given the license plates D – 1159 and D – 1439 . The former was last approved for the Dittmar Aviation School in Magdeburg in April 1932, after several changes of owner .

In 1928 a third aircraft called the A 20a (WNr. 52) was built, which received a Whirlwind engine with 200 HP (147 kW) and was registered in August as D-1482 . The acceptance flights were carried out by the DVL , whose in-flyer von Köppen certified the model as good-natured. So he did not succeed in causing the plane to spin . It was sold abroad in August 1930. The series ended in 1929 with the A 28, which received a passenger cabin that was 30 cm longer and a more powerful engine from Gnome-Rhône . This aircraft with the serial number 60 was also flown in by von Köppen and proved to be spin-proof. In June 1929 it was given the registration number D – 1664 and later became D – OXYK .

construction

The A 20 is a cantilever high-wing aircraft in wood construction . The fuselage is a wooden structure covered with fabric with an engine mount made of tubular steel and aluminum cladding. Behind the open pilot's seat is the plywood-clad passenger cabin with an entry door on the left and two windows on each side. The fuselage of the A 28 is made of tubular steel; the aircraft is therefore designed as a composite construction. She also has an additional fifth passenger seat next to the pilot.

The fabric-covered wing in Zanonia shape consists of a box spar with four spruce straps and ribs made of plywood . The front edge is also made of plywood. The 120 kg drop tanks are housed in the wing. The tail unit, which is also cantilevered, is a construction made of plywood ribs and spars with fabric covering, the rudder is balanced.

The chassis is rigid, rubber-sprung and has no continuous axle. A grinding spur is attached to the stern .

Technical specifications

Parameter	Data (A 20)	Data (A 28)
Crew / passengers	1/3 with 3½ h flight time 1/4 with 2 h flight time	1/5
span	16.0 m
length	10.2 m
height	3.0 m
Wing area	32 m²	34.50 m²
Passenger cabin (length × width × height)	1.75 m × 1.30 m × 1.80 m	2.05 m × 1.30 m × 1.80 m
Wing loading	44.5 kg / m²
Power load	11.8 kg / hp
Preparation mass	988 kg	1100 kg
Payload	437 kg
Takeoff mass	1425 kg	1800 kg
Fuel mass	120 kg
drive	a water-cooled six - cylinder in - line engine	an air-cooled five-cylinder - radial engine
Type	Mercedes D IIa	Gnôme-Rhône Titan
power	120 hp (88 kW) at 1400 rpm	240 hp (177 kW)
Top speed	145 km / h	180 km / h
Cruising speed		160 km / h
Landing speed		85 km / h
Rise time	10 min at 1000 m altitude
Summit height	3500 m	5000 m
Range		700 km
Take-off run	170 m
Landing runway	150 m

literature

• K. Grasmann (Hrsg.): Airplane type tables. DMZ 1925-1927 . 1977 (facsimile reprint Deutsche Motor-Zeitschrift No. 9/1927).
• Karl-Dieter Seifert: German air traffic 1926–1945 - on the way to world traffic . In: German aviation . tape 28 . Bernard & Graefe, Bonn 1999, ISBN 3-7637-6118-7 , pp. 299 ff .
• Reinhold Thiel : Focke-Wulf aircraft construction . Hauschild, Bremen 2011, ISBN 978-3-89757-489-2 , pp. 34 ff .

Web links

Commons : Focke-Wulf A 20  - Collection of images, videos and audio files

Individual evidence

1. ^ ^{A b c} Karl Ries: Research on the German aviation role. Part 1: 1919-1934 . Dieter Hoffmann, Mainz 1977, ISBN 3-87341-022-2 , p. 86, 107, 110 and 123 .