The Graf Zeppelin was a hydrogen-filled, rigid airship which operated commercially from 1928 to 1937. During that time it made 590 flights and flew more than a million miles. The Zeppelin could achieve a top speed of 80 mph (70 knots) at its maximum thrust of 2,650 horsepower and had a useable payload of 15,000 kg (33,000 lbs).Metal Earth is made from high quality steel sheets. Each model features amazing detail with parts cut from one or more 4” square steel sheets. Easy to follow instructions are included with each kit and NO GLUE OR SOLDER REQUIRED! Simply snip out the pieces and bend the tabs through corresponding connection points.