Early turbojet engines were not very fuel-efficient as their overall pressure ratio and turbine inlet temperature were severely limited by the technology available at the time.
Prvé prúdové motory boli veľmi neefektívne čo sa týka spotreby paliva a ich celkový tlakový pomer a teplota vstupných plynov turbíny boli veľmi obmedzené technológiou dostupnou v tom čase.