Mu 1935, kusinthidwa kwatsopano kwa akasinja a BT, omwe adalandira index ya BT-7, adagwiritsidwa ntchito ndikuyika kupanga misa. thanki anapangidwa mpaka 1940 ndipo m'malo kupanga ndi thanki T-34. (komanso werengani "Medium Tank T-44") Poyerekeza ndi tanki ya BT-5, masinthidwe ake amtunduwu asinthidwa, chitetezo cha zida zasinthidwa, ndipo injini yodalirika yakhazikitsidwa. Mbali ya kugwirizana kwa mbale zida za hull yachitika kale ndi kuwotcherera.
- BT-7RT - thanki yolamula yokhala ndi wayilesi 71-TK-1 kapena 71-TK-Z; kuyambira 1938 idapangidwa ndi conical turret;
- BT-7A - thanki yankhondo; zida: 76,2 mm KT-28 tank mfuti ndi 3 DT mfuti;
- BT-7M - thanki yokhala ndi V-2 injini ya dizilo.
Pazonse, akasinja opitilira 5700 a BT-7 adapangidwa. Iwo anagwiritsidwa ntchito pa ndawala ufulu ku Western Ukraine ndi Belarus, pa nkhondo ndi Finland ndi Great kukonda dziko lako War.
Akasinja a BT-7 anali ndi chiboliboli chokonzedwanso, chokhala ndi voliyumu yayikulu mkati, komanso zida zankhondo zokulirapo. Kuwotcherera kunagwiritsidwa ntchito kwambiri kulumikiza mbale zankhondo. Pa thanki pali injini ya M-17 ya mphamvu zochepa ndi makina osinthika oyaka. Kuchuluka kwa matanki amafuta kwawonjezeka. BT-7 inali ndi clutch yayikulu yatsopano ndi bokosi la gear lopangidwa ndi A. Morozov. Mabuleki oyenda ankagwiritsa ntchito mabuleki oyandama omwe anapangidwa ndi Pulofesa V. Zaslavsky. Mu 1935, chomeracho chinapatsidwa Lamulo la Lenin pazabwino za KhPZ m'munda wa zomangamanga.
Pa BT-7 ya kutulutsa koyamba, monga pa BT-5, nsanja zozungulira zidayikidwa. Koma kale mu 1937, nsanja za cylindrical zinaperekedwa kwa conical zonse zowotcherera, zomwe zimadziwika ndi makulidwe apamwamba a zida. Mu 1938, akasinja adalandira mawonekedwe atsopano a telescopic okhala ndi mawonekedwe okhazikika. Kuphatikiza apo, akasinja adayamba kugwiritsa ntchito mbozi zogawanika ndi phula locheperako, zomwe zidadziwonetsa bwino pakuyendetsa mwachangu. Kugwiritsa ntchito mayendedwe atsopano kumafuna kusintha kwa kapangidwe ka mawilo oyendetsa.
Ma BT-7 okhala ndi wailesi (okhala ndi cylindrical turret) anali ndi mlongoti wa handrail, koma ma BT-7 okhala ndi turret ya conical adalandira chikwapu chatsopano.
Mu 1938, akasinja ena (opanda mawailesi) adalandira mfuti yowonjezera ya DT yomwe ili mu turret niche. Panthawi imodzimodziyo, zida zinafunika kuchepetsedwa pang’ono. Akasinja ena anali ndi mfuti P-40 odana ndi ndege, komanso awiri amphamvu kufufuza nyali (monga BT-5) pamwamba pa mfuti ndi kutumikira kuwunikira chandamale. Komabe, pochita, magetsi oterowo sanagwiritsidwe ntchito, chifukwa zinapezeka kuti sizinali zophweka kusamalira ndi kugwira ntchito. Akasinja amatchedwa BT-7 "Betka" kapena "Betushka".
Chitsanzo chomaliza cha BT tank chinali BT-7M.
Zinachitikira kumenyana ku Spain (kumene nawo akasinja BT-5) anasonyeza kufunika kokhala ndi thanki patsogolo kwambiri mu utumiki, ndipo m'chaka cha 1938 ABTU anayamba kukhala wolowa m'malo BT - mkulu-liwiro matayala. -thanki yotsatiridwa yokhala ndi zida zofananira, koma yotetezedwa bwino komanso yopanda moto. Chotsatira chake, chitsanzo cha A-20 chinawonekera, ndiyeno A-30 (ngakhale kuti asilikali akutsutsana ndi makina awa). Komabe, makinawa sanali kupitiriza kwa mzere BT, koma chiyambi cha mzere T-34.
Limodzi ndi kupanga ndi wamakono akasinja BT pa KhPZ, anayamba kulenga wamphamvu thanki injini dizilo, amene m'tsogolo anayenera m'malo osadalirika, capricious ndi moto woopsa M-5 (M-17) carburetor injini. Kalelo mu 1931-1932, NAMI / NATI Design Bureau ku Moscow, motsogozedwa ndi Pulofesa A. K. Dyachkov, adapanga projekiti ya injini ya dizilo ya D-300 (12-cylinder, V-shaped, 300 hp), yopangidwa mwapadera kuti ikhazikike pa akasinja. . Komabe, mu 1935, chitsanzo choyamba cha injini ya dizilo chinamangidwa pa Kirov Plant ku Leningrad. Idayikidwa pa BT-5 ndikuyesedwa. Zotsatira zake zinali zokhumudwitsa, chifukwa mphamvu ya dizilo inali yosakwanira.
Pa KhPZ, dipatimenti ya 400, yotsogoleredwa ndi K. Cheplan, ikugwira ntchito yopanga injini za dizilo. Dipatimenti ya 400 inagwirizana ndi dipatimenti ya injini za VAMM ndi CIAM (Central Institute of Aircraft Engines). Mu 1933, injini dizilo BD-2 anaonekera (12 yamphamvu, V woboola pakati, kupanga 400 HP pa 1700 rpm, mafuta 180-190 g/hp/h). Mu November 1935 pa BT-5 anaika injini dizilo ndi kuyesedwa.
Mu March 1936, thanki ya dizilo inasonyezedwa kwa chipani chachikulu, boma ndi antchito ankhondo. BD-2 imafuna kukonzanso kwina. Ngakhale izi, idayikidwa kale mu 1937, pansi pa dzina la B-2. Panthawiyo, kukonzanso dipatimenti ya 400 kunali mkati, kutha ndi kuwonekera mu January 1939 kwa Kharkov Diesel Building Plant (HDZ), yomwe imadziwikanso kuti Plant No. 75. Inali KhDZ yomwe idakhala wopanga wamkulu wa V-2 dizilo.
Kuyambira 1935 mpaka 1940, akasinja 5328 BT-7 zosinthidwa zonse (kupatula BT-7A). Iwo anali mu utumiki ndi asilikali onyamula zida ndi mechanized wa Red Army pafupifupi nkhondo yonse.
