Avro Tutor
The Avro 621 Tutor was an aircraft of the British manufacturer Avro.
History
In 1929, Avro chief designer Roy Chadwick developed a two-seat training aircraft for the RAF as the successor to the legendary, but now somewhat dated Avro 504N. After experimenting with metal materials that had already been successfully processed by Fokker and the good experiences you had done with the first Avians with tubular steel frame, Chadwick the more stable compared to wood material decided well in this design to use.
The new model was due to application equipped with stable beams, and it was the large, easily appealing because rudder of Avian used. The powerplant was a fünfzylindriger undisguised Armstrong Siddeley Mongoose IIIA - line engine ( in the later military version as Mongoose IIIC called ).
In December 1929 the prototype was completed with the civilian registration G - AAKT in Martlesham and was first presented in Hendon on 28 June 1930. On 5 July 1930, the machine, referred to as the Avro 621 trainer in the King's Cup Race in part and showed there its excellent maneuverability.
Then Avro received an order from the Air Ministry over first 21 machines, which were then tested at various units of the Air Force. In March 1930, the Irish Air Force received three machines (where the aircraft was known as "Triton" ), a machine with civilian license plate went to the Australian airline Australian National Airways Ltd. ..
After this initial success selling the 621 has been modified and motorized with the more powerful Armstrong Siddeley Lynx IVC. First, two prototypes were equipped with this engine, later followed by a large number of other machines with the Lynx IVC.
After the tests, the Air Force decided it to put the now known as Avro 621 Tutor machine from June 1932 as the standard training aircraft in service. First, however, several changes had to be made at the factory; as a modified chassis was built, and ailerons were used on all four surfaces - in the first versions had only the lower wing ailerons. A new modification was made on the basis of a claim by the Air Ministry from model year 1934. A machine that was tested in 1936 in Martlesham with other fundamental changes was designated Avro 621 Tutor Mk II, but remained a one-off.
With the success of the tutor and the high sales new mass production techniques were introduced at Avro. So the machines were completely rebuilt at the factory in Newton Heath, then brought in the 24 km distant Woodford Aerodrome, there braced and flown in and transferred from there to the sites of the RAF.
In addition to the Royal Air Force, the main customers, machines were delivered to the Danish Navy, the Hellenic Air Force and to the Polish Ministry of Information. With Denmark Avro concluded a license agreement, but there only three machines were eventually built.
In the period from 1930 to 1938 Avro set forth Tutors total of 795, of which 310 without engines. Four machines were up to the year 1939 as a trainer in the service of the British Air Force. After the end of World War II a number of tutor in the Air Force were transferred to civilian hands.
A machine (serial number K3215/Kennung G- AHSA ) is still (as of 2005 ) in airworthy condition to the aircraft collection at Old Warden Shuttleworth (England).
Construction
The Avro 621 Tutor, it was a zweistieligen biplane. The fuselage consisted of a fabric -covered steel tube frame. The two wings were of equal length; all surfaces were equipped with ailerons.
The chassis consisted of a two-wheeled rigid main chassis and a rigid tail skid.
Variants / Projects
Avro 646 Sea Tutor
In the years 1934-1936 Avro delivered from a Vorserienexemplar and 14 series machines of this type. It was the float version of the Avro 621 Tutor, equipped with twin floats. Until 1938, this machine were in Felixstowe and at the Seaplane Training School in Calshot in use.
Avro 662
The Avro 662 was an advanced 621 with an Armstrong Siddeley Lynx engine. This machine was similar to one produced for the Egyptian Air Force version of the Avro 626, but did not go beyond the stage of development also.
Avro 669
Also the project Avro 669, a tutor with the 7- cylinder radial engine Armstrong Siddeley Cheetah IX was only planned on the drawing board, but never realized.
Military use
- Danemark Denmark: 5
- Iraq 1924 Iraq: 3
- Ireland Ireland: 3
- Canada 1921 Canada: 6
- Poland Poland: 2
- China Republic of China in 1928: 5
- South Africa Union of South Africa in 1928: 60
- United Kingdom United Kingdom Royal Air Force: 417
Specifications
Version with Mongoose IIIC engine (Version with Lynx - VIC- engine, if different, in parentheses)
An Armstrong Siddeley Lynx IVC with an output of 160 kW ( 218 hp )