In 1939 Hungary looked for a medium tank suitable for licensing. The Skoda design T-21 was turned into a Hungarian Turán. Before it was mass-produced the Czech tank was modified on a few points; a 3-man turret was substituted for the original 2-man turret, and a 260 HP V-8 engine designed by the Hungarian company Manfréd Weisz was installed. The first Turán I vehicles with 40mm gun and 50mm frontal armor were sent to the troops in June 1942, but fought only from 1943 on. Due to its design being 3 years outdated, the 40mm gun was not effective enough against the soviet tanks.