The Daphne SD-1A is a homebuilt aircraft that won second place in the 1970 EAA AirVenture Oshkosh flight efficiency contest.

The Daphne is a two place, side-by-side configuration, strut-braced, high-wing, conventional landing gear equipped homebuilt.

The fuselage is constructed of welded chromoly steel tubing, while the wings are made of wood, with one-piece plywood ribs.

Hoerner wingtips were utilized, due to their inherent higher efficiency and low-drag features.

[5] As of December 2023, there were 7 active Daphnes registered on the Federal Aviation Administration database, with 3 additional ones in Canada.