and 75 tonnes. The engine was an improved Maybach HL234 which had 900 hp. Maximum speed was supposed to be 60 km/h. E-75 Standardpanzer The E-75 Standardpanzer was intended to be the standard heavy tank to be used as a replacement of the Tiger II and Jagdtiger. The E-75 would have been built on the same production lines as the E-50 for ease of manufacture, and the two vehicles were to share many components, including the same Maybach HL 234 engine. The E-75 would have had much thicker armour however, and in fact compared to the Tiger II the E-75 had improved hull armour all round. As its name indicates, the resulting vehicle would have weighed in at over 75 tonnes, reducing its speed to around 40 km/h. To offset the increased weight, the bogies were spaced differently than on the E-50, with an extra pair added on each side, giving the E-75 a slightly improved track to ground contact length. According to some sources, the similarities between the E-50 and the E-75 went further; they were to be equipped with the same turret and 88 mm L/71 or L/100 gun, along with an optical rangefinder for increased long range accuracy (German scientists and engineers had successfully designed a 'schmal' or narrow turret and infra-red lighting and sights for use on the prototype [Panther F], as the war drew to a close). Other sources however, indicate that the E-75 was to be fitted with the much larger Tiger II turret, which could be adapted to accommodate an even more powerful high velocity 10.5 cm gun. E-100 The earliest ancestor of the E-100 was the Tiger-Maus. It was supposed to be a simplified Maus. The Tiger-Maus was never built, but it was to use components from the Tiger I Ausf. H and a slightly modified turret from the Maus. The E-100 was to be a superheavy combat tank designed to be the replacement for the prototype-only, Porsche-designed Maus. Development and building of a prototype E-100 started in 1944 but was largely abandoned after Adolf Hitler ordered an end to the development of the Maus. Only the chassis was finished. It was taken to the United Kingdom for evaluation purposes and eventually scrapped. During early development the Maus turret was used on the E-100, but later a modified Maus II turret was proposed to have been used. It would have housed 128