Tanks in World War I
The continued need for four men to drive the tank was solved with the Mark V which used Wilson's epicyclic gearing in 1918. Also in 1918 the French produced the Renault FT, the result of a co-operation between Estienne and Louis Renault. As mentioned before, it had the innovative turret position, and was operated by two men. At just 8 tons it was half the weight of the Medium A "Whippet" but the version with the cannon had more firepower. It was conceived for mass production, and the FT became the most produced tank of World War I by a wide margin, with over 3,000 delivered to the French Army. Large numbers were used by the Americans and several were also lent to the British.
10TP
The 10TP tank had a wide hull that made it possible to put two members of the crew inside side by side, a front machine gun and a 2-man turret. A solution to the problem of driving the vehicle both on wheels and tracks followed the American design, however Polish designers developed new, wider tracks, drive sprockets and a way of link hooking and moving. The tank steering system using hydraulic servomechanisms was their own advanced solution significantly affecting combat performance of the whole vehicle.