In the fall of 1979, Morry Hummel, who worked in the Curtis Wright experimental department during World War II, purchased the plans for Gary Watson's Windwagon and the development of the "Hummel Bird" began.

The dihedral break on the Windwagon was in the middle; Morry made the center wing section straight and put the dihedral break at the point where the outer wing panels bolt to the center section.

The spar cap angles are doubled in the center section, and tapered in the outer panels.

In July 1982, the plane was featured in an article written by Jack Cox, of Sport Aviation.

Jack dubbed Morry's new creation the “Hummel Bird” and the name stuck.

[3] Originally builders had to buy Windwagon plans as well as Hummel's modifications and try to incorporate the two.

An engineer by profession, Spring took a great many photos and consulted with Morry Hummel until he had the complete design.

He then created CAD drawings and a builders manual which now comprise the plans package available from Hummel Aviation.