The Short brothers built three similar seaplanes for the Royal Navy in 1912 and 1913, RNAS serials 10, 20 and 21. The concept of aircraft types had not arrived yet but the first one was c/n S.41. This example remained in use until July 1915, flying anti-submarine patrols from Great Yarmouth.

Delivered to the Norwegian Navy (in exile in Canada) on 25 March 1941 with the serial 20. In April 1941 it was integrated into the RAF, keeping its Norwegian serial. It served with 330 (Norwegian) Sqn in Iceland as GS-U. The squadron provided convoy escort duties for the sea lanes around Iceland during WW2. In 1942 the GS squadron code was removed, and also the serial was by then not carried anymore, only the U was retained. On 21 April 1943 it made a forced landing on the Thjórsá River in Iceland and sank. In 1979 the wreck was lifted and brought to Northrop for restoration. In November 1980 it was given to Norway and became an exhibit at the Forsvarets Flysamling at Gardermoen. The triangle marking on the fin is the Northrop logo.

Correct serial is 3-15. Marked as 40 on the other side. 4020 was the old regiment number.

Patrouille de France support aeroplane.

Escadron de Chasse (EC) 2/13 "Alpes"

FK.51 intermediate trainers, army air force serial numbers 10, 15 and 18 through 21, in flight over Holland. The first batch, s/n 1 through 10, were painted brown; the second batch were pale blue and the typeface of the serials was also changed. The pale blue machines here were all delivered on 9 February 1938. A fatal collision involving s/n 20 dates the photograph before 15 July of the same year. Photo from: Nederlands Instituut voor Militaire Historie

Seen during overhaul at Helisotas prior to delivery as '20' to the Lithuanian Air Force. It was previously registered as CCCP-25596.