Kelsey completed the K-16 in 1961, and first flew in that year.[3] The aircraft has a welded steel tube fuselage and a wooden structure wing, all covered in doped aircraft fabric covering. The 481NaN1 span wing employs a modified Göttingen airfoil. The landing gear is a center-line monowheel and a fixed skid.
Only one K-16 was built and it was registered with the US Federal Aviation Administration in the Experimental - Amateur-built and the Racing/exhibition categories.
The aircraft was flown by its designer to earn his diamond badge goal flight. Kelsey subsequently sold it to the Soaring Society of Utah, who in turn sold it in the spring of 1971 to Robert J. Leonard of Soap Lake, Washington. In the autumn of 1972 the aircraft was severely damaged by a wind storm, with both wings damaged, including one that was broken into two sections. The aircraft was rebuilt as an Experimental Aircraft Association local chapter project. In August 2011, fifty years after the aircraft was built, Leonard was still listed on the FAA registry as the owner.