There were no fixed vertical surfaces.

The fixed surfaces are ply-foam sandwich structures, carrying fabric covered control surfaces.

Both rudder and elevators had horn balances which projected beyond the fixed surfaces.

The fixed surfaces of the tail unit were also aluminium alloy structures with stressed metal skin.

There were no fixed rear surfaces, both elevators and rudder being all moving.

Rogallo believed that flexible wings provided more stability than fixed surfaces, leading to an elimination of rigid spars during flight.

The control surfaces were fabric covered, and the fixed surfaces ply skinned.

Rudder and elevators were balanced, the horns of the latter projecting well beyond the fixed surfaces.

The fixed surfaces were plywood skinned, but rudders and the elevator were fabric covered.

A small fixed vertical surface was also mounted above the upper wing.