The stability of the "tailless flying machine" is often put into doubt. That is the way it is with many people, pilot or not, held back psychologically by the idea that an airplane cannot safely and with a sufficient margin of stability operate with no tail. Yet, the various flying wing machines created by Fauvel and other designers leave no doubt that such devices are no less stable than those of a more classic design. And that the added "tailless" advantages are not to be disregarded...
When you think of a classic airplane, endowed with a stabilizer at the rear, you must know that:
- the machine can stall,
In a Fauvel flying wing,
these constraints do not exist. Jim Marske, a creative
designer of this form of sailplane, expresses his
thoughts thus :
Of all the fatal accidents involving general aviation at least half happen too frequently due to stalls and spins at low altitudes. In the domain of motorless flight, a sailplane that is more stall resistant is a considerable asset for the pilot who wishes to exploit weak thermal conditions close to the ground. The Fauvel flying wing has the ability to fly at low speeds with confidence because unexpected "stall breaks" translate into simple up and down motion often referred to as "porpoising". The tailless airplane is also endowed with good penetration of rough air at high speeds thanks to the reduced drag of the fuselage and the absence of interactions with a stabilizer. The compactness of the formula permits one to achieve much lighter structures, simpler mechanical interfaces and are cheaper to build. Thus, rather than to strengthen the structure of the device by the use of expensive material or by lowering the margins of safety, one decreases the parts count of the aircraft. In spite of popular thought, it is necessary to accept the fact that the flying wing will be the strongest structural design for a given weight. The AV-36, for example, was calculated to have the coefficient of 12 (number of G's before structural failure) with a mass weight of only 225 kg!
Present techniques of computer analysis permits one to have no fear of the aerodynamic phenomena that governs the domain of flight of these tailless machines. Of course, it is not all about a magic formula, and it doesn't provide the answer for all kinds of applications. Like all aeronautical concepts, it is a compromise between different parameters. As it happens, the Fauvel flying wing presents a remarkable compromise between security, cost, performance and complication, well adapted to the present needs of general aviation and the sportsman. Think of all these advantages the next time you board an airplane or a conventional sailplane, or if you think about designing your own flying machine !
--- Translated into English by Noble Faubion (firstname.lastname@example.org) ---