CMC 1920

Christie's 1920 SPG design with the 75 mm M1920 gun. Here the tracks
have been removed and the inner wheels jacked up for wheeled transportation.

There is very little information available about these "Christie Motor Carriage" SPGs. Two vehicles were tested in 1920 at the Aberdeen Proving Ground, one armed with a 75 mm Gun M1920 and the other with a 105 mm Howitzer M1920. They were powered by an unspecified 90 hp Christie engine. Something unique about this design is that the driver is facing backwards, so the tank goes faster in reverse than forward.

Christie's 1920 SPG design with the 105 mm M1920 howitzer.

Like most Christie designs, this tank was a wheel-cum-track design, meaning it could either travel on its conventional flat-track design, or on the road wheels themselves which drove the tracks. Because I'm future-proofing this by including alternate hulls and wheeled vehicles, it makes sense to me for the alternate hull for this tank to be the faster wheeled version. The tracked version could have more track health and a faster traverse speed.

Front view of the CMC 1920.

Rear view of the CMC 1920. Notice the backwards-facing driver.

In line with the rest of the Holt SPG branch, this tank should have above-average accuracy for its tier. This can be mitigated by giving it a poor reload speed and/or aim time. Armor on these "tanks", while unknown to me, should be practically nonexistent—even for something as commonly unarmored as an SPG.

Guns: 75 mm Gun M1920; 105 mm Howitzer M1920

Engines: Christie 90 (90 hp)

Suspensions/Alternate Hulls, Total Weight (metric tons): Christie 1920 tracked SPG (7.26); 
Christie 1920 wheeled SPG (8.17)

Hull Armor (mm): ??/??/??

Top Speed: 24 km/h (tracked); 32 km/h (wheeled)

Crew: 4 (Driver; Gunner; Loader; Commander/Radio/Loader)



Parent: Holt 75
Children: T82 HMC, Holt Mk. VI
See Also: CMC 1918, CMC 1919

Sources:

http://landships.info/landships/tank_articles.html?load=tank_articles/Christie_SPGs.html#

Hunnicutt, R. P., Stuart, 1995