Abstract: A helicopter (20) is equipped with a foam generating device (22) comprising a tank (1) associated with a pump system (2) and a mixer device (36) to deliver a mixture water-emulsifier. A spraying system (44) comprises two modules (44a, 44b) arranged on the side faces outside the helicopter (20), each module comprising a frame (3) mounted pivotally around and axis (6) between an upward inactive position and a lowered active position, and a network (4) linked with the exhaust pipe of the mixer device (36). The network (4) is placed under the blades (46) of the helicopter (20), and is constituted by a pattern of squares equipped with a multitude of sprinklers (5) which can spray the mixture water-emulsifier over the tight-mesh net (11) to produce foam under the action of the pressurized air generated by the blades (46). The moving of the modules (44a, 44b) between the two lifted and lowered positions is ensured by a lifting device (9) with hydraulic or electric control.

Abstract: A process is provided for the preparation of an overalkalinized additive for lubricant oils which consists of carbonating a reaction mixture composed of at least one detergent, one derivative of alkaline or alkaline earth metal, at least one nitrogenized and/or oxygenated promoter in a diluent oil and a hydrocarbonated solvent, and wherein the operation is carried out in the presence of at least one boron derivative. Also provided, the additives thus obtained and lubricant compositions containing the additive. These additives are homogeneous and stable, and have very good antiwear properties.

Abstract: The present invention relates to additives for lubricating oils having an antirust and antiwear effect, their process of preparation and the lubricating compositions containing the said additives, these additives consisting in a microdispersion in the oil of the metallic salts of amino-acids, wherein the dicarboxylic amino-acids and their derivatives are advantageously used and wherein the salts are generally formed with metals from Groups I and II of the Periodic Classification of Elements.