05/31/2009. The Nieuport 18 single-seat sesquiplane fighter, powered by an 80 hp Le Rhône 9C rotary, apparently failed to attain service status and little is recorded of this type. Its external appearance suggested that it was a derivative of the Nieuport 11, the fuselage and tail assembly of the earlier type being mated with a wider-track landing gear and a wing cellule with revised bracing geometry, the V-type interplane struts having a pronounced outward rake. A contemporary manual quoted the wing area of the Nieuport 18 as 139.9 sq.ft (13.00 sq.m).