The Arup S-3 was the third in a series of low aspect ratio aircraft developed by Dr. Snyder of South Bend, Indiana.
Around 1933 he was diagnosed with tuberculosis and left the company for the warmer climate of Florida where he developed his own variation, the Hoffman Flying Wing.
The aircraft featured a tall tricycle landing gear with a small tailwheel in case of over-rotation on takeoff.
The S-3 differed from the S-2 in that it included a small rudder and elevator at the rear of the fuselage, rather than placing all of the controls on the low aspect ratio wing.
It flew only once at St.Joe county airport with Glen Doolittle as the test pilot; the aircraft displayed poor performance.