List of Gyrodyne models Model / Versions 1954 XRON-1 1958 DSN / QH-50 DASH 1958 DSN-1 / QH-50A 1958 DSN-2 / QH-50B 1960 DSN-3 / QH-50C 1966 QH-50D 1968 QH-50D Nite Panther 1969 QH-50E