But Hitler gave the order to complete the subsequent development of lightweight Leo and all the power to throw a heavy fine-tuning options. "Lion" was redesigned in order so that it can be installed 150mm. tool L/40 or 150mm. L/37 (maybe it's 150mm. KwK 44 L/38), and the frontal armor increased to 140mm. Order to improve its features, track width has been increased to 900-1000mm., And speed up to 30km / h
But in late 1942, this project has been closed, and all efforts were focused on the development of the heavyweight Maus tank.
In the production of the Royal Tiger, designers planned to make a redesigned version of the Lion, armed 88mm. KwK L/71 gun and 140mm frontal armor. Its speed was to be 35 km / h, and the total weight — 90 tons. He should was equipped with a 12-cylinder engine Maybah HL 230 P 30, with a capacity 800l.s. The project length is 7.74 m (With gun), width — 3,83 m, height — 3,08 m The crew assumed the same as in the first model — 5 people. It was planned that Leo will replace the Tsar Tiger.
But the 5-6 March 1942 it was decided to develop a heavy tank and work on the project of Leo were curtailed. Leo never amounted even to the stage of the layout, but the work on its design were given the right experience for the creation of its more massive child — Mouse.