History Preserved: Carl Goldberg's Prototype Zipper

HISTORY PRESERVED As seen in the December 2016 issue of Model Aviation. Carl Goldberg’s Prototype Zipper Carl Goldberg’s Zipper is one of the most famous Free Flight models of all time. It is hard to believe that at its debut contest, the 1938 Nats, it wasn’t successful. Here’s the story in Carl’s own words (as quoted from the July 1939 issue of Air Trails). “[The Zipper] was finished at exactly 5 p.m. and the meet was due to close at 5:30. Two or three hasty test glides seemed to be O.K., and so I made the…