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The results of computational investigations carried out to clarify the possibilities of hydrogen scramjet thrust uprating in hypersonic flight (Mf>8) by adding to the fuel substances with higher density are presented. Thrust, specific impulse and density impulse are calculated while adding nitrogen, oxygen, water or inert liquated gases. For scramjet boosting in hypersonic flight it is suggested to add oxygen or a heavy inert gas to stoichiometric part of hydrogen instead of excessive part of hydrogen.