From now on, I’ll be including a lot more information into my initial comparisons, to give more discussion points on each tank:
BT-7 (USSR) vs Crusader (UK)
BT-7

Max Speed: 33mph (53km/h) (ROAD) *
Range: 270 miles (430km) *
Vertical Obstacle: 1’10’’ (0.55m)
Trench: 6’7’’ (2m)
Length: 18’7’’ (5.66m)
Width: 7’6’’ (2.29m)
Height: 7’11’’ (2.42m)
Weight: 30,644lb (13,900kg)
Ground Pressure: 11.25lb/sq in (0.79kg/sq cm)
Armour: 0.39’’ - 0.87’’ (10 - 22mm)
Armament: 1x 45mm M1935 gun, 1x 7.62mm MG coaxial with the main gun
Ammunition: 188x 45mm & 2,142 7.62mm
Service History: Red Army 1935 - 1945
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- the BT-7 could run on just road wheels without tracks - max speed on road wheels = 46mph (73km/h) and max range = 450miles (730km). There is no evidence that this feature was ever used by the Red Army
The BT series of tanks was developed from the American Christie tanks , one of which was purchased in 1930 and shipped to the Soviet Union. After extensive testing, the Revolutionary Military Council of the USSR authorised the type for use by the USSR. The first models, the BT-1 and BT-2 were armed with a 37mm gun, but this was replaced by the 45mm weapon in 1932.
The BT tanks were designed for use in the same way as cavalry in past wars, in the rear of the enemy attacking Headquarters, supply dumps etc. to make the best use of its long range and high speed. Large scale exercises showed that these missions would require artillery support, and many BT tanks were modified as self propelled guns with a short barelled 76.2mm gun. A commanders version was also developed.
The BT tanks suffered heavy losses at the hands of the invading Germans in 1941, partly because of a lack of training for crews and the lack of radios, adequate gun sights and other equipment. The BT-7 did lead to the BT-IS (IS = Investigator Tank) which had heavily sloped armour and contributed greatly to the development of the T-34.
Crusader III (UK)

Max Speed: 27mph (44km/h) (ROAD)
Range: 100 miles (160km)
Vertical Obstacle: 2’3’’ (0.685m)
Trench: 8’2’’ (2.59m)
Length: 19’8’’ (5.99m)
Width: 8’8’’ (2.64m)
Height: 7’4’’ (2.23m)
Weight: 44,240lb (20,040kg)
Ground Pressure: 14.7lb/sq in (1.04kg/sq cm)
Armour: 0.28’’ - 2’’ (7 - 51mm)
Armament: 1x 6pounder gun, 1x 7.92mm MG
Ammunition: ???
Service History: British Army 1939 - 1943
The Crusader was desinged as a Heavy Cruiser tank, although the 2pounder gun, the only weapon available in 1939, was the same weapon as on standard Cruiser tanks (and on the Infantry tanks to). The Crusader I and II had a second 7.92mm MG mounted in a small turret on the front left of the hull, but this was found to be fairly useless and was left out of the Crusader III. The early marks of the Crusader were rushed into service and in their first battle (Op Battleaxe in early 1941) more fell into enemy hands through mechanical break down than through battle damage. The Crusader also had the same drawback of all tanks with a two man turret, in that the Commander also had to work the radio and load the main armament as well as commanding the vehicle. The turret was also relatively small and cramped.
Despite these problems, the Crusader served all through the Desert Campaign, with the Crusader III in service by the time of El-Alemain. The modified mantlet used for the 6pounder versions of the Crusader could also mount a 3in (76.2mm) Howitzer for use as close support, although very few vehicles were armed with this weapon.
By the end of the Desert Campaign the Crusader was outdated and some were converted as anti aircraft tanks or as gun towers, serving in Italy and France.