Reinhold Tiling was a German scientist who, in April 1931, launched four solid-fueled rockets at Osnabruck. One exploded at an altitude of 150 m, two reached altitudes of between 450 and 600 m and, one reached an altitude of 2,000 m and a maximum speed of 1,100 km/h. Tiling later launched two more solid-fueled rockets, more advanced than the first four, from Wangerooge, one of the East Frisian Islands. Details of these tests are not certain, but one of the rockets is believed to have reached an altitude of about 10,000 m.