T47 HMC mock-up with the original turret design. |
The original design of the T47 HMC was based on the M3 light tank chassis, due to its expected availability over the newer M5 light chassis. However, this was soon changed to take advantage of the new chassis. The vehicle was to feature a 75 mm howitzer in an open-top, fully rotating turret, of which several versions were considered.
Previous howitzer motor carriages mounting the 75 mm Howitzer M1A1 encountered difficulty in properly shielding the gun. The T47 solved this issue by modifying the weapon mount to use components from the M4 Sherman. The new design provided an exceptional elevation range from +40 to -20 degrees. This new weapon was designated as the 75 mm Howitzer M2. In May 1942, the T47 HMC was standardized as the M8 HMC.
T47 HMC mock-up with a modified turret. |
Compared to the T41, the T47 has the clear advantages of having a fully-rotating turret and much steeper elevation angles, along with a better engine found standard on the M5 light tank. Starting here at Tier V, this branch of US begins to feature turrets and high firing arcs, similar to their British counterparts. While these tanks are comparatively faster and turreted, this can generally be compensated for with worse armor, worse gun characteristics, and smaller caliber sizes.
Guns: 75 mm Howitzer M1A1; 75 mm Howitzer M2
Engines: Guiberson T-1020-4 (245 hp); Continental W-670-9A (262 hp); Twin Cadillac, Series 42 (296 hp)
Turrets (Turret Armor (mm)): T47 Early (??/??/??); T47 Modified (??/??/??)
Turrets (Turret Armor (mm)): T47 Early (??/??/??); T47 Modified (??/??/??)
Suspensions/Alternate Hulls, Total Weight (metric tons): T47 (??); T47E1 (??)
Hull Armor (mm): 29/29/25
Top Speed: 48 km/h
Crew: 4 (Driver; Gunner; Loader; Commander/Radio)
Parent: T41 HMC
Children: M8 Scott
Sources:
Hunnicutt, R. P. Stuart. 1992.
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