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The alternate mounting for the weapon was on a trailer, designated T248 Vigilante A
By the early 1960s, the US Army declared that gun-based systems were outdated, and canceled further development in favor of the MIM-46 Mauler missile system that also failed to enter service. In the end the M163, a M61 Vulcan mounted on an M113, was used.
The designer, the Sperry Utah Engineering Laboratory, later revived the Vigilante, rechambering it for NATO-standard 35×228mm rounds and mounting it on a M48 Patton tank chassis for the Division Air Defense (DIVAD) contest. However, it ultimately lost to Ford's M247 Sergeant York (twin 40mm Bofors) that also failed to enter service.
Development
Very little information exists of the T249 Vigilante and its T250 cannon. The conceptual design for the T250 cannon was initiated in 1956. While the design of cannon of this caliber would ordinarily be handled by Watervliet Arsenal, it was decided that Springfield Armory would take responsibility due to their previous development experience with smaller caliber rotary cannon such the 20mm T171. The T250 was the largest Gatling gun ever assembled. Its 37×219mmSR round was based upon a shortened and necked-down 40×311mmR Bofors cartridge case. Hydraulically powered, the gun was able to vary between 120 rpm for (especially stationary) ground targets and 3,000 rpm for air targets.
It had a 192-round drum magazine, which in the maximum 3,000 rpm mode would have equated to approximately 4 seconds of fire. When Springfield engineers finished their work in 1962, the design was handed over to Watervliet for production. The Sperry Utah Engineering Laboratory was selected to handle the integration of the T250 gun with the modified M113 chassis to create the T249.
Surviving Examples
One T249 Vigilante is currently displayed at the Air Defense Artillery Training Support Facility, at Ft. Sill, OK. This example was previously located at the US Army Ordnance Museum in Aberdeen, MD. A T250 rotary cannon is also on display next to the T249 as of July 2023.
A T250 rotary cannon is on display in Wehrtechnische Studiensammlung in Koblenz, Germany.
The T250 on M113 chassis as T249 Vigilante B
United States
