The Cornelius Mallard was a single-engined light aircraft of very unusual configuration, tailless and with a swept forward wing of variable incidence.

[1] The first two, the FreWing and the LW-1 were conventional in layout but unusual in using independently variable incidence wings for pitch and roll control.

The wings of the Mallard could also be adjusted in the air,[1][2] but they were of low aspect ratio with marked forward sweep.

The rest of the aircraft was conventional, with single fin and rudder and a side-by-side cockpit for two behind a flat four engine.

[1] The Mallard first flew on 18 August 1943, flown by Arthur Reitherman,[2] though some sources[3] suggest that most of the subsequent 18 flights were in the hands of the Romanian aerobatic pilot Alexander Papana.