It seats up to nine people in a pressurized cabin and may be flown by one or two pilots. The design is of three-surface configuration, having both a small forward wing and a conventional tailplane, as well as its main wing, with the main wing spars passing behind the passenger cabin area. The Avanti's counter-rotating turboprop engines are placed on a mid-set, high-aspect-ratio wing located just behind the cabin. The three-surface design incorporates both a T-tail and a pair of small, fixed forewings having slight anhedral and landing flaps. On the Avanti II these flaps automatically deploy in concert with the main wing flaps. This reduces the load on the tailplane, even when the flaps are deployed, by reducing the pitch-down moment created by the deployment of the main wing flaps. This in turn allows the size of both the tailplane and the main wing to be reduced. This particular three-lifting-surface configuration was patented in 1982. The Avanti's forward wing flaps deploy automatically with the main wing flaps to maintain neutral pitch trim. The forward wing's angle of incidence is slightly greater than that of the main wing, so that it stalls before the main wing, producing an automatic nose-down effect prior to the onset of main-wing stall; its five-degree anhedral (negative dihedral) keeps the stream wash interference clear of the engine inlets, the main wing and the tailplane. For more information on the development of the Avanti and its 10 vaiants, click here. The specifications below are for the P.180 EVO variant.
