Folkerts SK-3

Folkerts SK-3
Role	Racing aircraft
National origin	United States of America
Designer	Clayton Folkerts
First flight	1937
Status	Crashed at 1938 Miami Air Races
Number built	1
Developed from	Folkerts SK-2

The Folkerts SK-3 a.k.a. "Jupiter, Pride of Lemont was the third in a series of air racers developed by Clayton Folkerts.

The SK-3 was built for mechanic, Rudy A. Kling from Lemont, Illinois as his personal racing aircraft. Kling assisted in the construction of the aircraft. The Folkerts SK-2 was the basis for the aircraft, with a slight upscaling in size with a larger Menasco C6-S engine.

The SK-3 was a midwinged conventional aircraft with retractable landing gear. The fuselage was long and slender. The thin wings used spruce wood spars, plywood covering and split flaps. The fuselage was welded steel tubing with aircraft fabric covering, built in two parts that were bolted together. The manual retractable landing gear used a single lever, rather than earlier crank systems. There were two 11 U.S. gallons (42 L; 9.2 imp gal) forward fuel tanks, a 27 U.S. gallons (100 L; 22 imp gal) main, and an auxiliary of 12 U.S. gallons (45 L; 10.0 imp gal) mounted behind the cockpit. The Menasco C6-S was modified by Kling to produce 400 hp (298 kW) at 3300 rpm, versus the standard 250 hp (186 kW) output.

Rudy Kling was the exclusive pilot of the SK-3. Kling had only 150 hours experience in a J-5-powered Travel Air before flying the racer. In the 1937 Greve Race, Kling came in at first place at 232.27 mph (374 km/h), just beating Wittman's Chief Oshkosh.

At the 1937 Thompson Trophy race in the National Air Races, he again won at 256.910 mph (413 km/h). On December 3, 1937, during the 1938 Miami Air Races, the SK-3 crashed in the wash of a larger aircraft with Kling dying on his 29th birthday.

Data from Sport Aviation

General characteristics

Performance

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