Sexton

     Notes: Though the Canadians and British liked the US M-7 Priest self-propelled howitzer, the 105mm howitzer was not a standard issue gun for the Canadians or British during World War 2, which led to supply problems.  The British MoD therefore decided to build a self-propelled howitzer based on the Priest, but using the 25-pounder field gun that was standard with Canadian and British forces.  This vehicle became the Sexton; in addition to the Canadian Army, the Sexton was used by the British (in the later years of the war) and several other Commonwealth nations used the Sexton.  The last known user was India, who used the Sexton II and the Sexton GPO until the mid-1980s, and still keeps most of their Sexton force in functional storage.

     The Sexton was actually three vehicles, all based around the 25-pounder gun.  The Australians also built an SPH based around the 25-pounder gun (the Yeremba), but based on yet a different chassis.  The Sexton I was based on the Ram tank; the Sexton II was based on the M-4A1 Sherman hull, and the Sexton GPO was a mobile FDC used with Sexton-equipped units (and will not be dealt with in this page.  At any rate, the Sexton ended up looking basically the same (since all three had a Sherman chassis), and differed only in small details.

     The Sexton I is based on a stock M-4 Sherman hull. Only 175 were built (with the remaining being Sexton IIs or GPOs).  The vehicle had a crew of six: driver, commander, gunner, gun-layer, loader, and radio operator.  As with most such vehicles, the interior is cramped, most internal space taken up with firing equipment, fuzes, charge bags, and the shells themselves.  The Sexton I used a British (later Canadian)-built engine, a Continental RG-75-C1 gasoline engine developing 400 horsepower, and with a manual transmission and with tillers for steering.  The Sexton II upped the ante to a Continental RG75 developing 475 horsepower, again with the manual transmission and tiller transmission.  The engine is at the rear on an extended chassis deck.

     The main armament consisted of a self-powered 25-pounder gun.  The gun has a depression of -9 degrees and an elevation of +40 degrees; it could also traverse 15 degrees right and 25 degrees left.  The howitzer had to be extensively modified to take the 25-pounder gun, particularly in the recoil dampening department and to compensate for a lack of gun trails.  Two Bren guns were provided to the crew, though they did not have actual mounts.  No pulpit-type mount, like on the US M-7 Priest, was present on the Sexton. The Sexton did, however, carry 50 magazines for its Bren guns.  Rudimentary (even for the time) aiming tools were provided; however, most firing calculations were carried out in the GPO.  There was no overhead protection, other than tarps which could be mounted on small bows.

     The Australian Yeramba took the same idea, using the same 25-pounder gun/howitzer.  The Yeramba was based on the M-3A5 Grant tank, however, with itís standard guns and turret removed.  The Yeremba is a post-war design, not produced until 1950-52, and in service only until 1957; it was, however, the cheapest solution the Australians had to the lack of mobile artillery for a few years.   The driver is in front under the main gun and the commander and loader have positions to occupy when they are traveling.  The Australians took the best parts of the Sherman suspension and melded them with the Grant chassis.  A pair of GM-6-71 diesels totaling 375 horsepower were installed in place of the gasoline engine. A Sherman-type suspension replaced the Grantís suspension, and a more substantial muzzle brake was added to the gun muzzle. The Yerambas were declared obsolete in 1957, and never saw any combat service, with only 14 such conversions taking place.  An advantage had by the Yeramba is somewhat heavier armor.

     In all cases, the armor was greatly reduced to accommodate the heavy weight of the main gun and still keep a decent speed, and because the vehicles were not expected to have toe-to-toe slugfests with enemy armor.  One Bren was placed in a small swiveling sponson up front; the other had no actual mount.

Vehicle

Price

Fuel Type

Load

Veh Wt

Crew

Mnt

Night Vision

Radiological

Sexton I

$238,849

G, A

500 kg

25.86 tons

6

20

Headlights

Open

Sexton II

$239,129

G, A

500 kg

26.4 tons

6

20

Headlights

Open

Yeramba

$239,538

D, A

500 kg

29 tons

6

22

Headlights

Open

 

Vehicle

Tr Mov

Com Mov

Fuel Cap

Fuel Cons

Config

Susp

Armor

Sexton I

126/88

35/24

682

214

Stnd

T5

HF8  HS3  HR3

Sexton II

140/98

39/27

682

257

Stnd

T5

HF8  HS3  HR3

Yeramba

112/78

31/22

682

134

Stnd

T5

HF10  HS5  HR4

 

Vehicle

Fire Control

Stabilization

Armament

Ammunition

Sexton I/II

None

None

25-Pounder (87.6mm) Howitzer, 2xBren

105x87.6mm, 1500x.303 (in 50-round Magazines)

Yeramba

None

Basic

25-Pounder (87.6mm) Howitzer, Bren (C), Bren

105x87.6mm, 1500x.303 (in 50-round Magazines)