Roundel history

RAF type A roundel.svg
Ratio 1:3:5
Type A On all light-coloured surfaces 1915-1942. With a thin white border (similar to later type A2) on camouflaged surfaces 1915-1919. Under-wing on some aircraft types (mainly fighters) June 1940 to replacement by type C June 1942.
RAF type A1 roundel.svg
Ratio 1:3:5:7
Type A.1 On all camouflaged surfaces 1937 - March 1939 (e.g.: Supermarine Spitfire); on fuselage sides 1939 to replacement by type C1, July 1942.
RAF type A2 roundel.svg
Ratio approximately 1:3:5:6
Type A.2 (Thin outer ring is yellow.) On dark surfaces 1919-1923; on flying boats and some prototypes 1923-1937; alternative to A.1 on some aircraft 1940-1942.
RAF type B roundel.svg
Ratio 2:5
Type B On some night flying aircraft, especially heavy bombers, 1918-1919. (Known at this time as the "night roundel"). On all surfaces of NIVO-coloured night bombers 1923-1937; On upper surfaces of many aircraft until 1947. On fuselage sides and upper wings of overall PRU Blue photo-reconnaissance aircraft 1940-1944 (e.g.:Photo-reconnaissance Spitfires) and aircraft with "High altitude" camouflage (e.g.: de Havilland Hornet) 1944-1947.
RAF type B1 roundel.svg
Type B.1 On some aircraft March-December 1939. Used on fuselage sides of some night-flying aircraft (bombers,e.g. Vickers Wellington, night fighters, e.g.: Boulton Paul Defiant) late 1940-mid 1942. Often type A1 repainted.
RAF type C roundel.svg
Ratio 3:4:8
Type C On light surfaces July 1942-1947; not used on upper surfaces 1942-1945.
RAF type C1 roundel.svg
Ratio 3:4:8:9
Type C.1 On dark surfaces except upper surfaces July 1942-January 1945; upper wings and fuselage sides of all 2 TAF bombers and photo-reconnaissance Spitfires, January 1945 to early 1947. Upper and lower wings and fuselage sides of 2 TAF fighters (e.g.: Hawker Tempest) January 1945 to early 1947.
RAF Far East Command roundel.svg
(SEAC) Used by units under South East Asia Command and in the CBI theatre mid 1942-46. Red removed to avoid confusion with the hinomaru. The normal roundel blue was mixed 50/50 with white.

Many fighter aircraft in the CBI theatre used roundels and fin flashes of approximately half the normal dimensions.

A blue/white roundel, sometimes accompanied by US-style white bars, was also used on Fleet Air Arm aircraft[3][4] Blue/white roundels were also used by the Royal Australian Air Force (RAAF), which simply had the red dot over-painted in white, regardless of previous proportions.

RAF roundel.svg
Ratio 1:2:3
Type D On all surfaces from June 1947 to this day, with the same proportions as the current French roundel of the Armee de l'Air. (note different proportions to Type A).
RAF roundel D pale.svg
Ratio 1:2:3
Type D pale A pale 'faded' version of the Type D. This was sometimes used when applied over anti-flash white. An intermediate (less faded) pale version was applied to some Vickers Valiants prior to the introduction of the definitive Type D 'faded' shading.
RAF Lowvis Army roundel.svg
Ratio 1:2
Low-visibility Low-visibility roundel used on camouflaged aircraft since the 1970s (note different proportions to Type B).
RAF roundel LV pale.svg
Ratio 1:2
Low-visibility Low-visibility roundel used in conjunction with air superiority grey schemes since the 1980s.