Abstract: Installation to be applied to self-propelled or tow-type agricultural seeders that comprises a general command central unit (5) fed from an electric power source and controls a corresponding individual control unit (10) that regulates the operation of the electro-pneumatic unit (6) associated to the seed dosing devices within the seeder to perform the pneumatic action. Electro-pneumatic unit may be a motor suction or a motor compressor unit. The invention envisages the association of these units to all the dosing devices in a seeding body of the seeder, to pairs of dosing units in the seeder, or else, on an individual basis, to each seed dosing device of the seeder.

Abstract: The invention relates to a convertible aircraft operating method. According to the invention, the aircraft comprises: a fuselage, standard fixed wings which are equipped with ailerons, a tail unit with flight-control surfaces, engines, a rotor with blades, a transmission which is placed between the engines and the rotor and which is equipped with rotor clutch and braking means, a landing gear, means for transition from helicopter mode to autogyro mode and vice versa, and means for direct or reverse transition from autogyro/helicopter mode to aeroplane mode. The lift for a range of low speeds is produced by means of the rotor, while the lift for a range of high speeds is produced by means of the wings. In addition, the lift for a range of intermediate speeds can be produced using the wings and the rotor in autogyro mode simultaneously, and take-off and landing can be performed in autogyro mode or in helicopter mode with the engines coupled to the rotor.