The Yeramba is an Australian self propelled howitzer developed during the late 1940s and seeing service from 1950-1957. Everyone calls it the Yeramba because nobody has the time to say it’s full name, “Ordnance, Quick Firing, 25 pdr Mark 2/1, on Mounting Self propelled 25 pdr (AUST) Mark 1, on Carrier, Grant, Self Propelled 25 pdr (AUST) Mark 1”.
In 1947 the Australian army, drawing from lessons learned in WW2, recognized the need for a armoured artillery unit having the same mobility as the tanks they were supporting, and so a program was undertaken to acquire self propelled gun. Modern vehicles from overseas were not available at the time so a decision was made to adapt some of Australia’s existing M3 Grant tanks to the role. Design queues were taken from a Canadian Sexton however it’s important to note the Yeramba was not a direct copy but an all new design. A welded open top super structure of 38mm armour was placed on the M3 Grant chassis, centrally mounting a QF 25 Pounder Mk 2/1 gun with a 20in recoil system and a muzzle break. And as with M3 Grants in Australia, an additional cast armour plate of up to 44mm thickness was mounted on the transmission tunnel on the front of the vehicle. The gun had a horizontal traverse of 40 degrees, and vertical of +40 degrees to -9.5 degrees, while storage was provided for 104 rounds of HE, Smoke and AP ammunition. Stronger M4 Sherman suspension units replaced the original M3 suspension. And secondary armament consisted of two 0.303 Bren light machine guns. The sights were the same units as the field gun.
14 total units were produced, serving with the 22nd Field Regiment, Royal Australian Artillery. By 1957 it was declared obsolete and retired, having never served in active combat.
Mass: 29 tonnes
Crew: 6 (Commander, Driver, 4 gun crew)
Armour: 38mm super structure, hull same as M3 Grant with additional plate of up to 44mm over the transmission tunnel
Main Armament: QF 25 Pounder (87.6mm) Mk 2/1
Secondary Armament: Two 0.303 Bren Light Machine Guns
Engine: Twin GM 6-71 diesel 375 horsepower
Top Speed: 40km/hr
Max Rate of Fire: 8 rounds per minute (7.5sec reload)