The SD-260 featured a strut-braced biplane layout, a two-seats-in-tandem open cockpit, with an optional bubble canopy, fixed conventional landing gear with wheel pants and a single engine in tractor configuration.
The aircraft fuselage was made from welded 4130 steel tubing. Its 221NaN1 span had a wooden structure with four ailerons, a wing area of 135square feet and was covered in doped aircraft fabric. The wing was supported by interplane struts, cabane struts and flying wires. The acceptable power range was 200to and the standard engine used was the 2600NaN0 Lycoming IO-540 powerplant.
The SD-260 had a typical empty weight of 1250lb and a gross weight of 1850lb, giving a useful load of 600lb. With full fuel of the payload for the pilot, passenger and baggage was 426lb.
The standard day, sea level, no wind, take off with a 2600NaN0 engine was 6000NaN0 and the landing roll was 8000NaN0.
The manufacturer estimated the construction time from the supplied kit as 1200 hours.
In March 2014 no examples were registered in the United States with the Federal Aviation Administration, although a total of two had been registered at one time. It is unlikely any remain in existence.[2]