Full Size Printed Plan CARL GOLDBERG'S FAMOUS Vintage 1939 Free flight `ZIPPER'
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Full Size Printed Plan & Building Notes
No materials. Plan only
CARL GOLDBERG'S FAMOUS
FULL SIZE Printed Plan on a 36” x 50” SHEET
Three Pages of building notes and photos
By CARL GOLDBERG'S
The "handwriting on the wall" appeared in the July 1939 issue of Air Trails. Carl Goldberg began an article entitled "The 1939 Gas Model," with these words, "When the thirty-second motor run rule was adopted early in 1938, the boom of large gas models for competitive work was sounded."
Carl went on to explain the theories behind the design he had created, a model which could handle the power of a big engine that would be required in order to get as much altitude as possible with the new "short" engine run. (Can you imagine what would have happened if someone had proposed 7 seconds in those days?)
The design Carl described was, of course, his famous Zipper. Advertising for the Comet kit had already appeared, and for years to come, this pylon ship, with its high center of lateral area (a total departure from the then popular existing theory), was to completely dominate the contest scene.
Other important design changes have come along in later years but Carl Goldberg and his Zipper represented the single most significant turning point in the history of gas powered free flight. From that time onward, the competition endurance gas model became a functional design in itself that no longer bore any but the most elementary resemblance to its man-carrying counterpart. It could also be said that the evolution was at least inevitable, if not regrettable! The modeler who might focus his, dissatisfaction on Carl for this should remember . .. the rule came first, Carl was only finding a way to make the most of it . . .