Restructured Development Test (DT II) of Howitzer, Medium, Towed 155-MM, XM198,
ABERDEEN PROVING GROUND MD
Pagination or Media Count:
The howitzer test item is a lightweight 15,000 pounds, towed 155-mm howitzer of split-trail design capable of being airlifted by the CH47C helicopter. It employs a high efficiency muzzle brake and, wherever practical, aluminum is used in the structure. To provide stability when firing, the wheels are raised and the weapon lowered onto a firing base hydraulically with hand pumps. The on-carriage traverse is limited to approximately 400 mils right and left of center. A rapid 6400-mil traverse capability is provided by an additional base plate installed behind the firing base. The cannon is designated the XM199 and is similar in design to the M185 cannon used on the M109A1 self-propelled howitzer. The XM45 recoil mechanism is a hydropneumatic variable dependent type which reduces recoil length at high angle fire. The fire control equipment is an improved version of the standard counter-type equipment designed for the bearing method of lay. Self-illumination is provided by means of radioactive materials.