WesWorld

In the aftermath of the conflict with the Chinese Empire in the South China Sea it became clear to the Philippine military that its force structure was wholly inadequate to respond to the possibility of a Chinese invasion of the Philippine national territory should the Philippine Navy be unable to prevent it. The surprise Chinese air attack on naval installations in the area of Subic Bay brought this possibility into sharp focus. While peace terms were negotiated shortly thereafter – on terms relatively favorable to the Philippines, the continued growth of Chinese amphibious assault capabilities suggested that China had not abandoned its designs on Luzon or other parts of the national territory.

The establishment of new military districts to control the recruitment, training and maintenance of units, together with the restructuring of the existing military formations – resulted in significantly smaller sized but better balanced divisions of the 1942 Establishment. One immediate need was to provide better motor transport for those divisions stationed on Luzon – those who would oppose the most likely threat; this was addressed by the acquisition of large quantities of motor vehicles from the United States and Czechoslovakia. Other needs were identified in a prioritized requirements list, as follows:


Battle Tank – desired maximum weight no more than 20 tonnes; preferable main armament – a gun of at least 75mm caliber capable of firing both high explosive and armor-piercing ammunition; secondary armament one coaxial rifle-caliber machinegun and one rifle-caliber machinegun mounted in the hull; preferable maximum armor 40mm commensurate with overall weight; minimum power/weight ratio 16 hp/tonne; preferable crew complement – 5.

Armored Car – desired maximum weight no more than 8 tonnes; preferable main armament – a gun of at least 37mm caliber capable of firing both high explosive, canister and armor-piercing ammunition; secondary armament one coaxial rifle-caliber machinegun; preferable maximum armor 15mm commensurate with overall weight; All wheel drive required; minimum power/weight ratio 12 hp/tonne; preferable crew complement – 3.

Anti-tank Gun (towed) – minimum caliber 57mm; desired battle weight no more than 1,500 kg; Capable of firing anti-tank, high explosive and canister munitions; minimum muzzle velocity 800 m/sec; minimum engagement range 500 meters.

Field Howitzer (towed) – minimum caliber 105mm; desired battle weight no more than 2,500 kg; Capable of firing high explosive, high explosive-antitank, shrapnel, smoke and chemical munitions; minimum muzzle velocity 400 m/sec; minimum range 11,000 meters.


Potential suppliers are invited to provide details of equipment conforming to the identified requirements for evaluation.

Quoted

Originally posted by BruceDuncan
Battle Tank – desired maximum weight no more than 20 tonnes; preferable main armament – a gun of at least 75mm caliber capable of firing both high explosive and armor-piercing ammunition; secondary armament one coaxial rifle-caliber machinegun and one rifle-caliber machinegun mounted in the hull; preferable maximum armor 40mm commensurate with overall weight; minimum power/weight ratio 16 hp/tonne; preferable crew complement – 5.

Renault submits their Char-6 Bruyere design, which meets or exceeds most of the requirements. The only two requirements not met are the crew size (four instead of five) and the requirement for a hull-mounted MG. There is a variant coming up with an oscillating turret, but that will be a bit.
Weight: 18 tons
Armament: 75mm/L40 with HE and AP, 1x coaxial MG
Armour: 40mm turret face and glacis
Power/weight ratio: 19 hp per ton
Crew: 4 (commander, gunner, driver, loader)

Quoted

Originally posted by BruceDuncan
Armored Car – desired maximum weight no more than 8 tonnes; preferable main armament – a gun of at least 37mm caliber capable of firing both high explosive, canister and armor-piercing ammunition; secondary armament one coaxial rifle-caliber machinegun; preferable maximum armor 15mm commensurate with overall weight; All wheel drive required; minimum power/weight ratio 12 hp/tonne; preferable crew complement – 3.

AMD Panhard 178, with the later 47mm gun, seems to meet that spec, too.

Quoted

Originally posted by BruceDuncan
Anti-tank Gun (towed) – minimum caliber 57mm; desired battle weight no more than 1,500 kg; Capable of firing anti-tank, high explosive and canister munitions; minimum muzzle velocity 800 m/sec; minimum engagement range 500 meters.

Unfortunately, France's Canon de 75mm L/53 TAZ Mle1939 rather exceeds the weight requirements by a significant margin, and the Canon de 75mm L/36.3 Mle1897/33, which does meet the weight requirements, is a modified old gun and hence not in production.

Quoted

Originally posted by BruceDuncan
Field Howitzer (towed) – minimum caliber 105mm; desired battle weight no more than 2,500 kg; Capable of firing high explosive, high explosive-antitank, shrapnel, smoke and chemical munitions; minimum muzzle velocity 400 m/sec; minimum range 11,000 meters.

Canon de 105mm Mle1935 Bourges and the Canon de 105mm Mle1934 Schneider seem to meet these requirements, although I've no information for their muzzle velocity.

Submissions from Great British maufacturers;

Battle Tank
Cruiser Tank Mk VII (British A19 Centaur)
An improved Crusader with bigger turret ring (for guns up to 75mm) and new turret and thicker armour with a Thornycroft RY14 500hp petrol engine. Designed 1940 by Leyland.
Weight: 28,712kg battle weight
Armament: one 75mm calibre main gun (not British, Philippine army to select favoured gun for intergration with new turret), one co-axial machine-gun and one front-hull mounted machine-gun.
Armour: 76-20mm
Crew: 5
Dimensions: 6.35m long, 3.04m wide, 2.48m high Maximum speed: 30mph road and 18mph cross-country
Power-to-weight: 17.8hp per tonne
Road Radius: 165 miles
Fording depth is 3ft; vertical obstacle 3ft and trench crossing 7ft 6ins.

Armoured Car
Daimler Armoured Car
Development began in April 1938 on a scaled-up Dingo. Carries turret of the Tetrarch light tank, has no chassis, drive via a fluid flywheel torque converter and pre-selector gearbox, has disc-brakes. Four-wheel drive with independent coil spings. Power is provided by a 95hp Daimler petrol engine.
Weight: 6803kg
Armament: one 2pdr 40mm gun (HE & AP shells) and one co-axial mahcine-gun
Armour: 16-6mm
Crew: 3
Dimensions: 4m long, 2.46m wide, 2.26m high
Maximum Speed: 50mph (road)
Power to weight ratio: 13.9 hp per tonne
Range: 200 miles

AEC Armoured Car
A private venture begun in late 1937 by Associated Equipment Company, makers of heavy trucks, buses and the Matador gun tractor. Based on the chassis of the Matador with a new body of flat armoured plate with a Vickers Valentine turret which can accept guns up to 57mm in calibre. The 105hp AEC diesel is mounted in the rear and tilted to lie alongside the rear differential to reduce height. Normally the front wheels are driven but over cross-country the rear wheels are engaged.
Weight: 9900kg
Armament: one 2pdr 40mm gun (HE & AP), or one 6pdr 57mm gun (HE & AP & HEFRAG), plus one co-axial machine-gun
Armour: 57-8mm
Crew: 3-4
Dimensions: 5.18m long, 2.74m wide, 2.54m high
Maximum Speed: 40mph
Power to Weight Ratio: 10.6hp per tonne
Range: 250 miles

Anti-Tank Gun
Ordnance 6pdr QF Mk IV
Calibre: 57mm
Weight of shot: 6.28lbs AP, 6.23lbs HE
Muzzle velocity: 822 m/ps
Penetration: 68mm at 914.4 metres
Weight in action: is 1120kg
Traverse is 90 degrees and elevation -5 to +15 degrees.

Argentina makes a submission. (I know its a bit heavy for the specification you require but its a long-shot if you want something a bit beefier.)


T-6M41 'Nahuel’ (Tiger)
Weight: 35,000kg (77,161lbs)
Dimensions: length 6.22m; width 2.33m and height 2.95m
Engine: one 500hp FMA-Lorraine Dietrich 12EB 12-cyl petrol
Top Road Speed: 24mph
Range 155 miles
Armour: 80-10mm armour
Armament: one 75mm M40 L/30 gun and one 13mm Browning HMG co-axial and one bow and one turret roof-mounted 7.92mm LMG
Crew: 5 (commander, gunnner, loader, driver and bow gunner/ radio operator

Designed by the Arsenal Esteban de Luca during 1940 as a new heavy tank with armour to defeat current and future RSAA anti-tank guns and to also serve in the support role with lighter fast tanks. The armour is 80mm thick and sloped on the glacis plate. The engine is a modified aero engine built under licence by FMA with several changes to increase reliability and to improve cooling. The M40 L/30 gun is the M33 L/24 with a longer barrel and a new AP shell. HE can also be fired. Vertical volute suspension is used and in general design the tank resembles the American M4. Prototype trials began in May 1941 and the tank is now entering production.

Submissions from the US Army:

Armoured Car

M8 Armoured Car

Armament: One 37mm gun, two 0.30in MGs
Armour: 19mm-3mm
Crew: 4
Dimensions: Length 5.01m (16ft 5in) Width 2.54m (8ft 4in) Height 2.26m (7ft 5in)
Weight: 7,802 kg (7.68 tons)
Powerplant: one 110 hp Hercules JXD I-6 gas
Speed: 100 km/h (60mph)
Range: 563 km (350 miles)

Designed as an offshoot to the tank destroyer requirement of 1941, this vehicle has just began testing and is expected to begin production mid-year.

Field Howitzer (Towed)

105mm Howitzer M2A1

Calibre: 105mm (4.134in)
Length of piece: 2.574m (101.35in)
Weight: traveling and in action 1,934 kg (4,260 Ib)
Elevation: -5 to 65 degrees
Traverse: 45 degrees
Muzzle Velocity: 472m (1,550 ft) per second
Range: 11,430m (12,500 yards)
Shell Weight: 14.97kg (33Ibs)

Designed after the Great War, the long years of Peace that have followed have meant that the final design was only completed in the 1930's.

The Philippine Army has selected the French Char-6 Bruyere to meet its requirement for a new battle tank and the American M8 to meet its requirement for a new armored car.

Final decisions on procurement on new field and antitank artillery remain outstanding.

The Philippine Army has selected the Russian M1938 divisional howitzer and the Russian 57mm antitank gun to meet its requirement for new field and antitank artillery.