The “Northrop” is an American copy of the “Zogling” which was designed in Germany in the 1920s as a training glider. Apparently, the Northrop primary glider takes its name from a Marvin Northrop of Minneapolis who imported a Zogling from Germany and from that glider had plans drawn and published in Modern Mechanics in 1930.
Thousands of Primaries were built all over the world starting with the Grunau 9 by Edmund Schneider. The Zogling was copied and modified by many. In Britain Slingsby got started with a copy called the “Dagling”
Wingspan: 10 m
Wing area: 15 sq.m
Wing chord: 1.5 m
Length: 5.428 m
Empty weight: 86 kg
Takeoff weight: 170 kg
Aspect ratio: 6.7
All Aero 