The 1935 Arup S-4 was a remake of the S-3, with a 70hp LeBlond engine. Small elevators were added atop the fin. Some reports tell of a return to conventional gear, but photos in Aug 1935 Popular Aviation show a nose gear.
US patent #2,062,148 was assigned to Cloyd Snyder in 1937 for a variable wingform aircraft.
Registered N14529, it was first flown on 19 March 1935. Only the one was built.
A smaller single-place replica was built and flown c.1985 in Bristol IN.
Engine: 70hp LeBlond
Wingspan: 22’0″
Length: 18’6″ Useful load (included two parachutes): 550 lb
Max speed: 110 mph
Stall: 28 mph
Ceiling: 9,000′
Aspect ratio 1:1.78
Seats: 2
All Aero 