VESTNIK of Samara University. Aerospace and Mechanical EngineeringVESTNIK of Samara University. Aerospace and Mechanical Engineering2542-04532541-7533Samara National Research University19710.18287/2541-7533-2004-0-2 (6)-74-79Investigating regularities of parameter dispersion for two-shaft and three-shaft enginessadohina@ssau.rusadohina@ssau.ruSamara State Aerospace University1806200432747915052014Copyright © 2015, VESTNIK of the Samara State Aerospace University2015The lines of parameter dispersion obtained by testing one hundred commercial two-shaft bypass engines are presented. The results of investigating regularities of parameter dispersion for two-shaft bypass engines and prospective three-shaft superhigh bypass ratio turbo propfan engines are given.