Societe Nationale D'etude Et De Construction De Moteurs D'aviation-Snecma

Bernard Debons

Thierry Le Fur

Andr&eacute; LaFond

Andr&eacute; Dumortier

The thrust device comprises a valve body ( ) having a chamber ( ) surrounding part of the needle, at least one gas admission opening ( ) opening out into the chamber, and a gas outlet opening ( ) opening out into the chamber and defined by a wall portion which co-operates with a nose portion ( ) of a moving needle ( ) to define an outlet section for gas leaving the chamber. Actuator means ( ) control the position of the needle in the valve body by acting on a rear end portion of the needle. The nose ( ) of the moving needle ( ) has an aerodynamic concave profile ( ) and the wall portion ( ) which defines the outlet ( ) from the chamber is shaped in such a manner as to be capable of directing the exiting gases essentially against the concave side of the nose of the needle, which needle acts as the main member for taking up thrust.

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Lege, France

Bernard Debons