|Sk 3 - Avro 504 (1926-1928)|
Avro 504 was a simple and reliable design that
was built in large numbers (more than 8.000 machines) during WWI. The
type was ordered in 1913 by both the British Army (RFC) and Navy (RNAS)
as a general-purpose aircraft. Its most well-known effort was the
bombing of the Zeppelin sheds at Friedrichshafen on the 21th of November
1914. After a limited time of front-line service, the 504 was relegated
to second-line duties. Most important was its use as a trainer aircraft.
The Swedish Navy Aviation ordered in 1923 and
1924 five Avro 504Ks in England. The 504K was the standard
trainer variant with a universal engine mounting where engines of
rotary, inline or radial types could be fitted. The Swedish 504Ks were
equipped with rotating 130 hp Clerget engines. They were used as
trainers in the winter (on frozen sea) at the Navy Flying School at Hägernäs
near Stockholm. The five aircraft got the Navy numbers 6-10.
five aircraft were transferred to the new Air Force in 1926. They were
now based at the new War Flying School at Ljungbyhed. The new
designation was Sk 3. Their registration numbers were changed to 072-076.
December 1925, the Army Aviation Company ordered an Avro 504N, which was
delivered in April 1926, just before the forming of the independent Air
Force. The Avro 504N was an improved aircraft with a number of
structural revisions, an improved landing gear that eliminated the
central skid of earlier models (including the Navy 504Ks) and was
powered with the stronger Armstrong Siddeley Lynx IV engine. This engine
delivered 170 hp and eliminated the disadvantages of a rotating engine.
504N got the registration number (0)64, a number it kept during its time
in the Air Force. The designation was altered to Sk
3A. The aircraft was purchased for evaluation, but the Air Force
decided not to buy any more aircraft of this type. The ex-army aircraft
was instead used as a trainer at F 3 at Malmslätt. It was destroyed
after only one year of service. In April, the Sk 3A crashed and had to
be written off.
the ex-navy Sk 3s had a short career in the Air Force. The pilot of 072
crashed fatally in the end of 1927. 075 and 076 were written off in the
beginning of 1928 after crashes. The remaining 073 and 074 were written
off in the summer of 1928 due to wear.
3: Length: 8,97 m. Span: 10,97 m. MTOW 830 kg. Max. speed: 137 km/h.
Photo below: Two Avro 504K:s with the Navy numbers 6 and 7 at Malmslätt, probably in 1925. (Before they were transferred to the Air Force and became Sk 3).
© Lars Henriksson