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Condor Aero Shoestring K-10




The original Shoestring was designed by Rod Kriemendahl and was built in Van Nuys, California, by Carl and Vince Ast, with help. Shoestring is a Formula One airplane. Its 19-foot wing has an aspect ratio of over five. All Formula One racers are required to have a minimum of 66 square feet of wing area, but Rivets and Shoestring stand alone with their tapered, longish wings. Apparently, the better overall efficiency of the higher aspect ratio wings is well worth the slight increase in drag because these two airplanes consistently bring home all the trophies.
The original drawings and engineering studies done by Kriemendahl in 1949 were lost or destroyed, a fact that worried John Anderson, one of the several past owners of the original Shoestring. Before Anderson sold the airplane to Ray Cote, he commissioned Ketner, a Piper engineering draftsman at Vero Beach, to go through the airplane with a tape measure and dividers and come up with a set of drawings he could use for repair work in case he ever dinged it. Ketner measured until he had enough dimensions to make up a complete set of working drawings. He had an engineering study run on the main spar and it was increased in thickness to bring it up to a 10-G strength. He has proof loaded the fuselage structure to 9 Gs with no deformation.

Constructed from the conventional combination of steel tubing, wood, and fabric, the racer is powered by a 100-hp O-200 Continental engine. By 1974, the Shoestring racer had accumulated 14 first places in major air race competitions. Other recommended engines are the Continental 85-and 90-hp versions.
The aircraft first flew in 1949 and entered its first competition race in 1950.
Yellow Jacket, the first reproduction of Shoestring, was built by Jim Strode of Melbourne, Florida. The plans for the airplane are produced by Landis Ketner and Jim was building parts as fast as Landis could make the drawings.Building Shoestring Yellow Jacket took just over a year.
Strode made four different cowlings before he got the shape and weight he wanted. This one weighs only 11 pounds. The cowling, wing fairings, landing gear fairings, and the canopy fit into their own little recesses, making everything flush. The wing is completely wooden construction, with plywood skins.



Engine: 85-100 hp.
Span: 19’.
Wing area: 66 sq.ft.
Length: 17’8”.
Max wt: 800 lbs.
Empty wt: 565 lbs.
ROC: 3000 fpm.
Max speed: 225 mph.
Stall: 65 mph.
Cruise: 173 kts.
Fuel cap: 10 USG.
Takeoff run 500 ft.
Range 360 miles.
Seats: 1.


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