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The Christie M1931 originated as the M1928, which used Christie's suspension, and had the ability to run on its tracks or the wheels.The M1928 was demonstrated unofficially to the US Army by traversing a route at an average speed of 45 km/h (28 mph); by contrast the US Army's T1E1 tanks – expected to replace their WWI-era M1917 light tanks – averaged 16 km/h (9.9 mph) over the same route.
The Christie suspension is a suspension system developed by American engineer J. Walter Christie for his tank designs. It allowed considerably longer movement than conventional leaf spring systems then in common use, which allowed his tanks to have considerably greater cross-country speed.
John Walter Christie (May 6, 1865 – January 11, 1944) was an American engineer and inventor. [1] He is known best for developing the Christie suspension system used for several World War II-era tank designs, most notably the Soviet BT and T-34 [3] tanks series, and the United Kingdom Covenanter and Crusader Cruiser tanks, as well as the Comet heavy cruiser tank.
Patton later worked closely with Christie to improve the silhouette, suspension, power, and armament of the tanks. Christie's ideas had a great impact upon tank tactics and unit organization in many countries and, finally, upon the U.S. Army as well. On 21 November 1930, Douglas MacArthur had been made chief of staff, with the rank of general. [7]
The medium tank M1921 was a medium tank built in the United States in the inter-war period. In design, it was similar to earlier World War I era tanks. United States Army engineers worked on the design of the tank, with some influence from British designs of the period, and from the earlier war experience.
Christie used the experience gained before and during World War I to develop his "Convertible Suspension", which allowed a vehicle to run on either tracks or wheels. Most tanks of the time period weren't durable enough to be drive to the front on their own, so instead were delivered by trucks and then driven to where they were needed.
Chris Christie on 'The View' ; Mark Cuban on 'Shark Tank' "In the last few days, I think voters who were undecided are looking to listen to the candidates. I think the surrogates have minimal ...
In the late 1920s, the Polish Armed Forces identified a need for a new tank design. The Wojskowy Instytut Badań Inżynierii (WIBI), or "Military Engineering Research Institute", dispatched Captain Ruciński to the United States to legally acquire a Christie M1928 tank, along with its blueprints and a licence for production.