The Facetmobile (properly FMX-4 Facetmobile) is a homebuilt aircraft designed by Barnaby Wainfan a well known professional aerodynamicist and homebuilt aircraft expert. While only one Facetmobile prototype was produced it has become well known due to its unique nature. The aircraft is something of a cross between a lifting body and flying wing configuration - the whole aircraft is one low aspect ratio wing: a flat angular lifting shape.