almost all of the SBs had either been replaced or lost, although it remained in large-scale use until March 1942 in the North against Finland. SBs continued in use for non-combat roles such as supply dropping, glider towing and training, and continued in use in the Far East until 1945. Finnish use Many Soviet SBs crashed or force-landed on Finnish soil during the Winter War, with the Finns salvaging as many aircraft as possible, with those in the best condition being sent to Valtion lentokonetehdas for possible repair for use by the Finnish air force. By the time of the Continuation War against the Soviet Union, five SBs had been repaired (with a further three added later), being used to equip Lentolaivue 6, flying maritime patrol and attack missions. These aircraft were supplemented by a further 16 SBs purchased from Germany, which had captured them during the initial weeks of the invasion of the Soviet Union. These SBs employed the first air-dropped depth charges used in combat. Finland lost seven SBs to accidents during the Continuation War, with none being lost in combat, with Finnish SBs claiming three Soviet submarines and a 4,000 ton merchant ship sunk. Variants ANT-35 – Airliner version. Also designated PS-35. ANT-38 – Unbuilt 1934 proposal for high speed bomber – possibly related to ANT-41. ANT-40 RTs (Rayt Tsiklon) or SB: first prototype with 545 kW (730 hp) Wright-Cyclone engines and with 19.0 m (62 ft 4 in) wingspan. It was completed in September 1934, making its first flight on 7 October 1934. It was damaged in a forced landing and rebuilt with 670 kW (900 hp) Tumansky M-87 engines, and a second set of test flights were made from 5 February to 31 July 1935. Development not continued as ANT-40 IS was superior. Used as experimental (ski gears, etc.) model. ANT-40 IS (Hispano-Suiza): Prototypes powered by 560 kW (750 hp) Hispano-Suiza 12Y engines, and with longer span (20.3 m (66 ft 7¼ in) wings. Two built, with the first ANT-401 flying on 30 December 1934, reaching during initial tests and 402 km/h (250 mph) during later flights. Second example, ANT-402, with modified wings and tail emerged in September 1935 and served as a production prototype. ANT-41 – unrelated Torpedo bomber with similar layout to SB but larger and more powerful. One built in 1936, abandoned after destroyed in crash due to severe flutter. ANT-46 –