Although none of the proposals from the first Questionmark conference were selected for development, the conference served a very useful purpose in exchanging ideas. To obtain alternate design concepts from the industry, a research and development program was initiated in April 1952. Under this program, contracts were awareded to the H. L. Yoh Company, Inc.. The company presented a report on June 1, 1953 outlining seven preliminary design concepts for a new medium tank. The tank concepts ranged from conventional to outlandish. All seven tanks used the AOSI-1195-5 engine and mounted the 105 mm T140 gun.
The fourth proposal installed the main armament inside an oscillating turret mounted inside a shield ring. The crew members were in their conventional positions and the tank was estimated to weigh 47 tons.
While It's not specified if this tank used an automatic loader or not, I think it would be fair to give it one. It could simply be the same 105 mm gun from the T54E1, with either an extra shell and a similar reload speed for its drum, or the same number of shells and simply a quicker reload. In either case, the tank is considerably better armored.
The M-IV-Y would play similarly to the T57 Heavy. It'd be faster and the shield ring would act as spaced armor. However, this can be balanced by having a considerably worse drum reload speed than the T57 Heavy. It would also have a very prominent cupola.
Guns: 105 mm Gun T140E2 (autoloader)
Engines: Continental AOSI-1195-5 (675 hp)
Turrets (Turret Armor (mm)): M-IV-Y (??/??/??)
Suspensions/Alternate Hulls, Total Weight (metric tons): M-IV-Y (42.66)
Hull Armor (mm): 127/??/??
Top Speed: 48 km/h
Crew: 4 (Driver; Gunner; Loader; Commander/Radio)
Sources:
Hunnicutt, R. P. Abrams, 2015
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