The design of the T-15 obviously was similar to that of the Mark III light tank prototype.
The suspension was made out of Horstmann coil spring resting on bogies with two rubber-lined wheel sets per bogie.
This design, invented by Sidney Horstmann and exclusively used on lightweight vehicles, was also used up to the Light Tank Mk VI of the British Army.
Apart from being relatively easy to build, compact and lightweight, it had the advantage of having a long travel, and of being easy to replace when damaged in the field.
The drive sprocket was in the front, the idler-wheels were placed in the rear, with two return rollers.
Power came from a Henry Meadows 6-cylinder gasoline engine, producing 88 hp (66 kW), coupled with a four speed preselector gearbox.
Steering was a combination of declutching the drive to one track and braking to increase the turn.
The traverse of the turret was electrically actuated.
The T-15s were not equipped with a radio.

The armor of the Belgian T-15 version was considerably less than that on the original Mark III design: instead of 12–14 mm of armor steel, only 7–9 mm were used.
 This meant that the T-15 crew was only fully protected against indirect blast and splinter damage, and reasonably well protected against small arms fire (except at point-blank range perpendicular to the armour), but was not protected at all against most light anti-tank rounds, such as the .50 BMG, the 0.55 in Boys anti-tank rifle, the German 13.2 mm TuF or indeed its own 13.2 mm (0.52 in) Hotchkiss round.
Even at European standards of the time the T-15 tank could be considered underarmored.
The tradeoff was - apart from a political one - excellent mobility: at an only 3.8 metric tons weight, but powered by an 88 hp (66 kW) engine, the T-15 had a remarkable top speed of 64 km/h (40 mph), well suited to cavalry tactics.
It was hoped this would turn the T-15 into a harder target to hit.

The primary armament of the T-15 tank was the 13.2 mm Hotchkiss machine gun, already in use with the Belgian air force as a light anti-aircraft gun.
Although intended as an anti-aircraft gun, it had some anti-armor capabilities: it could penetrate 13 mm of armor plate at a range of 500 m (1,640 ft).
Barrel length was 992 mm (39.06 in).
It fired from 25 or 30 cartridge box magazines at a rate of 450 rounds per minute.
This gave the T-15 the theoretical capability to take out most enemy armored cars, half-tracks and soft-skinned vehicles.
Apart from the machinegun-armed Panzer I however, the T-15 armament was no match for the heavier German tanks, nor was it meant to be.
The secondary armament consisted of a single pintle-mounted light M1918 Browning Automatic Rifle (BAR), meant as a form of anti-aircraft defence.
To fire the BAR the gunner had to be exposed to enemy fire.
The design of the T-15 obviously was similar to that of the Mark III light tank prototype. The suspension was made out of Horstmann coil spring resting on bogies with two rubber-lined wheel sets per bogie. This design, invented by Sidney Horstmann and exclusively used on lightweight vehicles, was also used up to the Light Tank Mk VI of the British Army. Apart from being relatively easy to build, compact and lightweight, it had the advantage of having a long travel, and of being easy to replace when damaged in the field. The drive sprocket was in the front, the idler-wheels were placed in the rear, with two return rollers. Power came from a Henry Meadows 6-cylinder gasoline engine, producing 88 hp (66 kW), coupled with a four speed preselector gearbox. Steering was a combination of declutching the drive to one track and braking to increase the turn. The traverse of the turret was electrically actuated. The T-15s were not equipped with a radio.
The armor of the Belgian T-15 version was considerably less than that on the original Mark III design: instead of 12–14 mm of armor steel, only 7–9 mm were used.  This meant that the T-15 crew was only fully protected against indirect blast and splinter damage, and reasonably well protected against small arms fire (except at point-blank range perpendicular to the armour), but was not protected at all against most light anti-tank rounds, such as the .50 BMG, the 0.55 in Boys anti-tank rifle, the German 13.2 mm TuF or indeed its own 13.2 mm (0.52 in) Hotchkiss round. Even at European standards of the time the T-15 tank could be considered underarmored. The tradeoff was - apart from a political one - excellent mobility: at an only 3.8 metric tons weight, but powered by an 88 hp (66 kW) engine, the T-15 had a remarkable top speed of 64 km/h (40 mph), well suited to cavalry tactics. It was hoped this would turn the T-15 into a harder target to hit.
The primary armament of the T-15 tank was the 13.2 mm Hotchkiss machine gun, already in use with the Belgian air force as a light anti-aircraft gun. Although intended as an anti-aircraft gun, it had some anti-armor capabilities: it could penetrate 13 mm of armor plate at a range of 500 m (1,640 ft). Barrel length was 992 mm (39.06 in). It fired from 25 or 30 cartridge box magazines at a rate of 450 rounds per minute. This gave the T-15 the theoretical capability to take out most enemy armored cars, half-tracks and soft-skinned vehicles. Apart from the machinegun-armed Panzer I however, the T-15 armament was no match for the heavier German tanks, nor was it meant to be. The secondary armament consisted of a single pintle-mounted light M1918 Browning Automatic Rifle (BAR), meant as a form of anti-aircraft defence. To fire the BAR the gunner had to be exposed to enemy fire.
Vickers T-15 light tank