German Helicopters 1928-1945 by Heinz J. Nowarra
English | Jan 1, 1991 | ISBN: 0887402895 | 48 Pages | PDF | 12.7 MB
English | Jan 1, 1991 | ISBN: 0887402895 | 48 Pages | PDF | 12.7 MB
Among the makers of these unusual aircraft were Focke-Wulf, Flettner and Wiener-Naustadter.