Arado S III

Arado S III
Type:	Trainer aircraft
Design country:	German Empire
Manufacturer:	Arado
First flight:	Summer 1928
Production time:	1928
Number of pieces:	1

The Arado S III is a German training aircraft produced by the Arado Flugzeugwerke in Warnemünde as a single specimen in the 1920s .

development

The S III was created as a result of a rush order from Turkey. Since the sample was supposed to be completed in just eight days, no construction documents were prepared by him. Instead, the designer Walter Rethel gave his building specifications orally, largely based on the SI from 1925 . The fuselage structure was largely adopted, the landing gear and the statics of the structure slightly modified. A Sh 11 with 96 hp take-off power was used as the drive . The construction of the aircraft with serial number 39 was carried out in continuous day and night work and could be completed within the required period. The subsequent transport to Turkey took place by land. There the S III was flown in front of the client by Werner Junck , whereby the engine power was assessed as too weak. The Sh 11 was therefore replaced by a Sh 12 with 125 hp. It is not known whether and how the S III was used in Turkey.

construction

The S III is a cantilever, unrestrained one -and-a-half-decker with a staggered structure in a composite construction .

hull

The fuselage was essentially similar to that of the S I and consisted of a welded tubular steel frame with a rectangular cross-section, which was planked with sheet metal in the area of ​​the engine and otherwise covered with fabric. The back of the fuselage behind the cabins was covered with a detachable, semicircular shell, which ensured easy access to the control mechanisms. The engine suspension was designed to be pivotable forward and down so that the drive could be changed by just two people without the aid of a pulley. There was a fire bulkhead between the engine and the forward crew cabin. The S III was equipped with a double control system that could be deactivated by the flight instructor for the student's cabin during the flight.

Structure

The wings consisted of wooden frameworks with two box spars, the intervening planking of which was made of plywood. The remaining areas were covered with fabric. While the upper wing was continuous, the lower wing consisted of two parts. The structure was connected to each other and to the fuselage by N struts. In the upper wing were the two fuel tanks designed as drop tanks with a capacity of 45 l each. Long and narrow ailerons were only used in the upper wing.

Tail unit

The tail unit, supported by I-stems towards the fuselage, consisted of tubular steel frames covered with fabric. The oars were not balanced.

landing gear

The S III had a rigid, rubber cable-sprung main landing gear, the wheels of which were connected to one another by an axle. There was a grinding spur at the stern.

Technical specifications

Parameter	Data
crew	1-2
span	above 11.50 m below 8.50 m
length	7.50 m
height	2.75 m
Wing area	27.3 m²
Empty mass	600 kg
Payload	225 kg
Takeoff mass	825 kg
drive	an air-cooled seven-cylinder - four stroke - radial engine
Type	Siemens & Halske Sh 11
Starting power nominal power continuous power	96 PS (71 kW) 86 PS (63 kW) close to the ground 84 PS (62 kW) close to the ground
Fuel volume	90 l
Top speed	128 km / h near the ground
Cruising speed	105 km / h
Landing speed	50 km / h
Rise time	10.25 min at 1000 m altitude 22.5 min at 2000 m altitude
Service ceiling	3700 m
Range	k. A.
Take-off / landing runway	55 m / 37 m

literature

• Volker Koos: Arado Flugzeugwerke 1925–1945 . Heel, Königswinter 2007, ISBN 978-3-89880-728-9 , pp. 19/20 .
• Jörg Armin Kranzhoff: Arado. History of an aircraft factory . Aviatic, Oberhaching 1995, ISBN 3-925505-27-X , p. 18 .
• Helmut Stützer: The German military aircraft 1919–1934 . E. S. Mittler & Sohn, Herford 1984, ISBN 3-8132-0184-8 , p. 194 .

Individual evidence

1. ↑ Volker Koos: Aviation between the Baltic Sea and Breitling . Transpress, Berlin 1990, ISBN 3-344-00480-8 , pp. 107 .