Heinkel HD-37 (licensed-built German aircraft) I-8 - Tupolev ANT-13 I-9 - Grigorovich I-10 - Grigorovich I-11 - Polikarpov I-12 - Tupolev ANT-23 I-13 - Polikarpov I-14 - Tupolev ANT-31 I-15/I-15bis/I-153 - Polikarpov TsKB-3 I-16 - Polikarpov TsKB-12/18/29 I-17 - Polikarpov TsKB-15/19/25/33 I-18 - Polikarpov TsKB-43 (unbuilt) I-21 - Ilyushin I-21 - Pashinin I-22 - Lavochkin-Gorbunov-Gudkov LaGG-1 I-26 - Yakovlev Yak-1. '26' is from Yakovlev AIR series designations. I-28 - Yatsenko I-29 - Yakovlev Yak-2 I-30 - Yakovlev Yak-1 I-33 - Yakovlev Yak-3 IP (ИП) - Istrebitel Pushetchnii (cannon fighter) IP-1 - Grigorovich IP-2 - Grigorovich IP-4 - Grigorovich IP-21 - Pashinin IS (ИС) - Istrebitel Skladnoi (folding fighter) IS-1 & IS-2 - Nikitin K (K) - Korablennyi (shipborne) (Generic designation - not used for specific types) KR (KР) - Korabelnii Razvedchik (shipboard reconnaissance) KR-1 - Heinkel HD 55 KR-2 - Beriev Be-2/KOR-1 KR (KР) - KReiser (cruiser = heavy long-range fighter) KR-6 - Tupolev ANT-7/R-6 on floats KOR (KOР) - Korabelnii O Razvedchik – (shipboard catapult reconnaissance) KOR-1 - Beriev Be-2 KOR-2 - Beriev Be-4 KOR-3 - Beriev Be-5, not built LBSh (ЛБШ) - Lyogki Bronirovannyi Shturmovik (light armoured-attack) LBSh - KochyeriginM (М) - Morskoi (marine = seaplane) (Generic designation - not used for specific types)MBR (МБР) - Morskoi Blizhnii Razvedchik (short-range reconnaissance seaplane)MBR-1 - Bartini project MBR-2 - Beriev MP-1 MBR-3 - Samsonov MBR-4 - Savoia-Marchetti SM.62bis MBR-5 - Samsonov MBR-7 - Beriev MS-8MDR (МДР) - Morskoi Dalnii Razvedchik (long-range reconnaissance seaplane)MDR-1 - Grigorovich ROM-2 MDR-2 - Tupolev ANT-8 MDR-3 - Chyetverikov TsKB-11 MDR-4 - Tupolev ANT-27, later MTB-1 MDR-5 - Beriev MS-5 MDR-6 - Chyetverikov Che-2 MDR-7 - Shavrov MDR-10 - BerievMDRT (МДРТ) - Morskoi Dalnii Razvedchik Torpedonosets (long-range reconnaissance seaplane torpedo bomber)MDRT - BerievMI (МИ) - Mnogomestnii Istrebitel (multi-seat fighter)MI-3 - Tupolev ANT-21MP (МП) - Morskoi Passazhirskiy (passenger seaplane)MP-1 - Beriev MBR-2 MP-2 - Chyetverikov ARK-3MR (МР) - Morskoi Razvedchik (reconnaissance seaplane)MR-1 - Polikarpov R-1 on floats MR-2 - Grigorovich MR-3 - OMOS MR-3 - Grigorovich MR-5 - Grigorovich MR-5 - Polikarpov R-5 on floats MR-6 - TupolevMTB (МТБ) - Morskoi Torpedonosyets Bombardirovshchik (naval torpedo bomber) MTB-1 - Tupolev ANT-27 MTB-2 - Tupolev ANT-44 MU (МУ) - Morskoi Uchebny (seaplane trainer) MU-1 - Avro 504 MU-2 - Polikarpov U-2M MU-3 - Moskaleyev MU-4 - Nikitin PS (ПС) - Passazhirskii Samolyot (passenger aircraft or airliner) PS-3 - Tupolev R-3 PS-3 - Junkers W 33 PS-4 - Junkers W