Lippisch's development of his Aerofoil Boat, a ground effect vehicle for use over water, began whilst he was working in the aviation division of the Collins Radio Company in Cedar Rapids, Iowa, US.

[2] Specifically, it is claimed that it is stable in pitch and also that it can fly in ground effect at altitudes up to about 50% of its span, allowing it to operate over rough water.

This contrasts with the lower aspect ratio square wing of the Ekranoplans which leaves ground effect at only 10% of span, limiting them to the calmer waters of lakes and rivers.

Its wing was set high on the fuselage, with swept fins at the tips inclined at about 60°, carrying short ailerons.

[1] The Aerofoil Boat was powered by a Nelson flat four engine derated to 30 kW (40 hp), driving a two blade, wooden, tractor propeller.