Canon Automoteur DE 75 mm SAu 40

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Arcade Realistic Simulator

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General info

The SAu 40 in the garage.

The Canon Automoteur DE 75 mm SAu 40 (DE 75 mm Self-Propelled Gun SAu 40) is a Rank II French tank destroyer with a battle rating of 2.0 (AB/RB/SB). It was introduced in Update 1.75 "La Résistance". It distinguish itself by its very tall cupola and thick gun barrel. This tank is equipped with APHE rounds, a rare feature in the French tech tree.

The main purpose, usage and tactics recommendations

General play style

The Saumua 40 behaves as a classical casemate SPG as it should provide its teammates with superior firepower from medium to far distance, behind the frontlines where it will be harder to flank. As this is its purposed role, this tank has some issues accomplishing it. The first being its relatively low penetration and shell velocity, which makes long range engagements (>750 m)a bit hard to manage. The second being bad mobility, which complicates the task of positioning.

Vehicle characteristics

As it was developped from the French S.35, this tank shares many of its characteristics such as ~40 mm cast hull bolted onto the chassis, which is barely a widened version of its original. The track system is mostly the same as on the S.35, with 25 mm plates covering the roller wheels. As for the hull, its two 8 mm grilles over the engine compartment and doors on the side reinforces the impression that it's just a widened S.35 hull.

Armour:

As this tank is based off the S.35, it shares many of its attributes when it comes to armour. A slight angle can defeat most shots this tank will take at this BR, this is useful to know when getting into position: from a distance and not showing neither side nor front to the enemy, you should be safe. As for frontal armour, its 40 mm overall thickness is not strong enough to withstand anything bigger than AA fire. But, a thing to consider with this weird pattern is its "bouncy" behaviour, principally around the gun mantlet: complex angles may just bounce some shots, making them loose some energy before hitting the main armour, this feature is peculiarly distinctive at gun's height.

The main weakness of this tank is its very tall commander's cupola, which makes it quite easy to spot and destroy, as it is thinner than the main armour. Any APHE penetrating this area will kill the tank's commander, thus disabling its only MG and some shrapnels may even damage or kill the driver, disabling this tank for good. A way to avoid getting spotted too easily is buying camouflage for the front cupola area, making it look more like a bush popping out a hill than a tank's turret. Try to hide the tank's lower hull part as it is only 35 mm thick.

Mobility:

While being mounted on a widened S.35 hull, this heavier tank has about 70 HP less than its predecessor, making it quite slow and unwieldy. In order to fulfill the task of getting into position, one should choose its route wisely and avoid risky spots as this tank's awful reverse speed and hull turning rate makes it quite bad at hasty retreats. Mobility with the Somua 40 is an issue. It is arguably what makes this tank hard to master as it does not allow for good map placement.

Firepower:

As any casemate SPG, this tank's main feature is its main gun...kind of. With average penetration rates for this BR with a maximum of 73 mm at point-blank ranges (comparably, the Russian SU-76M penetrates 80 mm with its basic APHE shell and up to 135 mm with APCR shots). While being one of the rare French tank shooting APHE shells, increasing its one-shot potential, this round noticeably fails to explode when flanking enemies as this round takes 25 mm of steel to detonate. Another concern being its slow horizontal traverse, which makes it hard to react to fast-paced situations. This gun placement makes this tank quite vulnerable: being low, it exposes the SOMUA 40 to enemy fire when popping up a hill.

As for the turreted MAC 31 MG, it does not helps at anything more than taking down truck-mounted guns. This turret is slow, which negates the possibility of chasing planes with it. It also has poor rate of fire and is low calibre, so even if you manage to hit a plane, it will not do much to it.

Tactics

Act as a classical SPG while keeping in mind your slow pace. There is nothing very much interesting nor special you can do with this tank.

Specific enemies worth noting

At this BR, there is many good armour you could face. With its poor penetration rates, this tank will struggle against these heavily-armoured foes:

Nation-us-flag.png
USA
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Germany
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USSR
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Britain
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Japan
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Italy
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France
M4A1 Sherman
M4 Sherman
M4A3 (105) Sherman
M4A5 Ram II
StuH 42 G T-34 1940, 1941, 1942
KV-1 L-11
SMK
SU-122
Matilda II
3 inch Gun Carrier
Churchill Mk I
No Japanese tank has fearsome
armour, beware their guns.
P40 "Leoncello" (rare) ARL 44 (ACL-1)
B1 bis, ter
M4A1 Sherman

Counter-tactics

As with any casemate SPGs, this tank's firepower is nullified by flanking it. Being quite slow, this tactic is much more effective. Small advice for truck-mounted guns: beware is turreted MG, which can rotate 360°.

Pros and cons

Pros:

  • Firepower
  • Decent 75mm cannon with explosive filler gives it good one-shot potential.
  • "Terrific" MAC 31 gun mounted in cupola.
  • Competitive reload time
  • Good HE shells for dealing with SPAAs at the BR.
  • Depression and elevation angles are acceptable.
  • Armour is quite thick on all sides.
  • Gun mantlet area is strong

Cons:

  • Commander's cupola is badly designed.
  • Tall commander’s cupola.
  • Turret-mounted 7.5 mm MG does not allow for shooting down planes.
  • Weak, unslopped armour makes it a shot trap
  • Makes it easy to spot while bringing no tactical advantage.
  • Slow in all domains.
  • Engine is underpowered
  • Turret is slow
  • Guns feels "lazy"
  • Rather weak frontal armour due to bad sloping
  • Three crew members can quickly lead to combat efficiency loss.
  • Huge ammo rack near gunner makes it easy to one-shot.

Specifications

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Arcade Realistic Simulator

Arcade Realistic Simulator

Armaments

1 x 75 mm APX cannon (102 rounds)
1 x 7,5 mm MAC 31 machine gun (3,250 rounds)

Main armament

1 x 75 mm APX cannon
  • Ammunition Capacity: 102 Shells
  • Gun Depression: -10°
  • Gun Elevation: 30°
  • Turret Rotation Speed: 3.6°/s (Stock), __._°/s (Upgraded), __._°/s (Prior + Full Crew), __._°/s (Prior + Expert Qualif.), __._°/s (Prior + Ace Qualif.)
  • Reloading Rate: 7.2s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)
1 x 75 mm APX cannon
  • Ammunition Capacity: 102 Shells
  • Gun Depression: -10°
  • Gun Elevation: 30°
  • Turret Rotation Speed: 3.6°/s (Stock), __._°/s (Upgraded), __._°/s (Prior + Full Crew), __._°/s (Prior + Expert Qualif.), __._°/s (Prior + Ace Qualif.)
  • Reloading Rate: 7.2s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)
1 x 75 mm APX cannon
  • Ammunition Capacity: 102 Shells
  • Gun Depression: -10°
  • Gun Elevation: 30°
  • Turret Rotation Speed: 3.6°/s (Stock), __._°/s (Upgraded), __._°/s (Prior + Full Crew), __._°/s (Prior + Expert Qualif.), __._°/s (Prior + Ace Qualif.)
  • Reloading Rate: 7.2s (Stock), __._s (Full Crew), __._s (Prior + Expert Qualif.), __._s (Prior + Ace Qualif.)
Ammunition
Ammunition Penetration in mm @ 90° Type of
warhead
Velocity
in m/s
Projectile
Mass in kg
Fuse delay in m: Fuse sensitivity in mm: Explosive Mass in
TNT equivalent
in g:
Normalization At 30° from horizontal: Ricochet:
10m 100m 500m 1000m 1500m 2000m 0% 50% 100%
Mle1910M 73 71 61 50 43 36 APHE 570 6.4 1.2 25 90 ° 43° 30° 25°
Mle1917 10 10 10 10 10 10 HE 577 6.1 0.4 0.1 675 +0° 11° 10°
Ammo racks
Ammo racks on the SAu 40
Full
ammo
1st
rack empty
2nd
rack empty
3rd
rack empty
4th
rack empty
5th
rack empty
Recommendations Visual
discrepancy
102 84 (+18) 66 (+36) 42 (+60) 18 (+84) (+83) Floor only: 18 (+83) no

Secondary armament

1 x 7,5 mm MAC 31 machine gun (Commander’s turret)

Crew

  • Commander
  • Gunner
  • Driver

Total: 3 Crew members

Armour

Armour type:

  • Cast homogeneous armour
Armour Front (Slope angle) Sides Rear Roof
Hull 40 mm (0-73°) Front glacis
34 mm (1-54°) Lower glacis
60 mm (0-53°) Gun mantlet
40 mm (0-24°), 34 mm (43-63°) Top
40 (1-3°) + 25 mm (0-89°) Bottom
34 mm (20-49°) Top
34 mm (4-71°) Bottom
20 mm
8 mm Engine grille
Turret 38 mm (5-48°)
25 mm Gun mantlet
38 mm (16-38°) 38 mm (11-38°) 20 mm
34 mm Dome

Notes:

  • Suspension wheels are 15 mm thick while tracks are 20 mm thick.
  • Turret underside is 20 mm thick.
  • Turret ring is 30 mm thick.
  • Turret base is 34 mm thick.

Engine & mobility

Weight: 24.0 ton

Max Speed: 40 km/h
Stock

  • Engine Power: 270 hp @ 2000 rpm
  • Power-to-Weight Ratio: 11.25 hp/ton
  • Maximum Inclination: 30°

Upgraded

  • Engine Power: ___ hp @ 2000 rpm
  • Power-to-Weight Ratio: __.__ hp/ton
  • Maximum Inclination: __°
Weight: 24.0 ton

Max Speed: 37 km/h
Stock

  • Engine Power: 168 hp @ 2000 rpm
  • Power-to-Weight Ratio: 7.00 hp/ton
  • Maximum Inclination: 32°

Upgraded

  • Engine Power: ___ hp @ 2000 rpm
  • Power-to-Weight Ratio: __.__ hp/ton
  • Maximum Inclination: __°
Weight: 24.0 ton

Max Speed: 37 km/h
Stock

  • Engine Power: 168 hp @ 2000 rpm
  • Power-to-Weight Ratio: 7.00 hp/ton
  • Maximum Inclination: 32°

Upgraded

  • Engine Power: ___ hp @ 2000 rpm
  • Power-to-Weight Ratio: __.__ hp/ton
  • Maximum Inclination: __°

Modules and improvements

History of creation and combat usage

Screenshots and fan art

Skins and camouflages for the _____ from live.warthunder.com.

Additional information (links)

[Devblog] SAu 40 - The Ugly Duckling

References


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fr_somua_sau40.png

Icon-country-fra.png SAu 40
Nation France
Type Tank destroyer
Rank 2
Battle Rating
2.0
2.0
2.0

   Metric✓       Imperial   

   Metric       Imperial✓   

Characteristics
Weight
24,000 kg
52,911 lb
Number of Crew 3
Hull armour thickness
40/40/34/20 mm
1.57/1.57/1.34/0.79 inches
Statistics
Engine power (stock)
270 hp
168 hp
168 hp
Engine power (upgraded)
____ hp
190 hp
190 hp
HP/ton ratio (stock)
11.25
11.43
7.00
7.11
7.00
7.11
HP/ton ratio (Upgraded)
__.__
__.__
7.92
8.04
7.92
8.04
Max speed
40 km/h
25 mph
37 km/h
23 mph
37 km/h
23 mph
Main Weapon
1 x 75 mm APX Cannon
Ammo stowage 102 rounds
Vertical guidance -10°/30°
Horizontal guidance -7°/8°
Secondary Weapon
1 x 7.5 mm MAC 31 Machine gun
Ammo stowage 3,250 rounds
Mount Cupola
Vertical guidance -9°/20°
Economy
Required RP 5,900 RP
Vehicle cost 6,300 SL
Crew training cost 1,800 SL
Max repair cost*
350 SL
380 SL
480 SL
Free repair time (Stock)
20m
33m
37m
Free repair time (Upgraded)
6m
11m
12m
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