Method for placing payload in orbit by multifunctional launch vehicle of combined scheme with cruise liquid rocket engine system (lres), multifunctional launch vehicle of combined scheme with cruise lres and method of refining it

A method for refining a multifunctional combined scheme launch vehicle with cruise LRESs, the method comprising the steps of:

• selecting size-mass characteristics of a central rocket unit and thrust characteristics of its cruise LRES;
• selecting characteristics of acceleration rocket units and thrust characteristics of their cruise LRESs;
• designing and manufacturing said rocket units,
• forming from said rocket units a tandem scheme launch vehicle having a monounit lower stage;
• conducting ground-based and flight-structural tests of the tandem scheme launch vehicles, wherein a level of adjustment of a thrust of the central rocket unit cruise LRES is set within a range of 0.3-1.0 of its nominal thrust;
• forming a lower multiunit stage from side rocket units which are identical by size-mass characteristics and thrust characteristics of the cruise LRES to the central rocket unit refined on the tandem scheme launch vehicle, wherein data obtained from tests of the tandem scheme launch vehicle with the monounit lower stage are used for confirming reliability of the side rocket units with the cruise LRESs of the combined scheme launch vehicle.