Resolution du probleme des instabilites sur le moteur Viking

(Resolution of the instability problem on Viking motor)—This paper gives the experimental and theorical work program which has permitted one to resolve the Viking motor instability problems and to ensure the L03 launching, one year after the L02 launching failure. After an exploration phase of search for working anomalies, instabilities have been characterized, acceptation procedure has been ratified, and different modifications have been tried.Theoretical work associated with the synthesis of experimental results have led to the finishing touch of operation and stability representative models. The pointing out of specific parameters has influenced the research of some solutions and the orientation of future works.     

La prévention des instabilités pogo sur ariane 1

This article presents the organization of POGO studies on the Ariane 1 launcher, the input data for the systems, the studies concerning the first stage L140, the second stage L33 and the constructive conclusions drawn from these studies.