With the development of the Mk. IX SPG falling behind schedule, Holt decided to move on and create the Mk. X in 1922 as an intermediate design. This vehicle was significantly lighter and shorter than the previous Mk. IX. It was designed to mount the 4.7-Inch gun M1906, a logical progression of increasing calibers based on Holt's earlier works. However, this weapon was interchangeable with a 155 mm howitzer—probably the French Schneider Mle. 1917, licensed by the United States as the 155 mm Howtizer M1917.
The vehicle weighed about 10,900 kg and was powered by a 4-cylinder 150 hp Sterling engine, although an unspecified 110 hp engine by Holt was also considered. The vehicle had a maximum speed of 16 mph.
One prototype would be built, and although it was positively received, several problems with the platform and hostility from the Field Artillery Branch would prevent it from reaching the production stage. The surviving vehicle is on display at the Field Artillery Museum in Fort Sill, Oklahoma.
Guns: 4.7-Inch Gun M1906; 155 mm Gun M1917
Engines: Holt 110 (110 hp); Sterling 150 (150 hp)
Suspensions/Alternate Hulls, Total Weight (metric tons): Holt Mark X (9.07); Holt Mark X Modified (10.9)
Hull Armor (mm): ??/??/??
Top Speed: 26 km/h
Crew: 6 (Driver; Gunner; Loader; Loader; Commander; Radio)
Parent: Holt Mk. VI
Children: Holt Mk. IX
Sources:
Parent: Holt Mk. VI
Children: Holt Mk. IX
Sources:
http://landships.info/landships/tank_articles.html?load=tank_articles/Holt_SPGs.html#
http://aviarmor.net/tww2/tanks/usa/spg_holt_mk10.htm
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