the usual direct drive: The propeller may be ahead of the tail: inside the framework (Farman III), in line with the fuselage (RFB Fantrainer), between tail booms (Cessna Skymaster), above the fuselage on wing (Quad City Challenger), on nacelle or axial pod (Lake Buccaneer), or coaxially around rear fuselage (Gallaudet D-4). The propeller may be located behind the vertical tail, under the horizontal tail (Prescott Pusher). Engines and propellers may be located on wings (Piaggio P.180 Avanti) or on lateral pods(Embraer/FMA CBA 123 Vector). The engine may be buried in a forward remote location, driving the propeller by drive shaft or belt: The propeller may be located ahead of the tail, behind the wing (Eipper Quicksilver) or inside the airframe (Rhein Flugzeugbau RW 3 Multoplan). The propeller may be located inside the tail, either cruciform or ducted fan (Marvelette). The propeller may be located at the rear, behind a conventional tail (Bede BD-5). The propeller may be located above the fuselage such as on many small flying boats (Lake Buccaneer) In canard designs a smaller wing is sited forward of the aircraft's main wing. This class mainly uses a direct drive, either single engine, axial propeller or twin engines with a symmetrical layout or an in line layout (push-pull) as the Rutan Voyager. In tailless aircraft such as Lippisch Delta 1 and Westland-Hill Pterodactyl type I and IV, horizontal stabilizers at the rear of the aircraft are absent. Flying wings like the Northrop YB-35 are tailless aircraft without distinct fuselage. In these installations, the engines are either mounted in nacelles or the fuselage on tailless aircraft, or buried in the wing on flying wings, driving propellers behind the trailing edge of the wing, often by extension shaft. Almost without exception flexwing aircraft, paramotors and powered parachutes use a pusher configuration. Other craft with pusher configurations run on flat surfaces, land, water, snow or ice. Thrust is provided by propellers and ducted fans, located to the rear of the vehicle. Hovercraft, lifted by an air cushion, such as the 58 passengers SR.N6. Airboat, flat bottomed vessels planing on water, Propeller-driven snowmobiles, also known as aerosleighs or Aerosani In aircraft Advantages The drive shaft of a pusher engine is in compression in normal operation, which places less stress on it than being in tension in a tractor configuration. Practical requirements Placing the cockpit forward of the wing to balance the weight of