ˈɜːli pɹˈoʊɾoʊtˌaɪps pɹədˈuːst vˈɛɹi smˈɔːl ɐmˈaʊnts ʌv θɹˈʌst, bᵻfˌoːɹ ɡlˈuːhɛɹv dɪvˈɛləpt ɪt fɹʌm ˈɜːli ɛkspˈɛɹɪmənts ˌɔn pɹədˈuːsɪŋ θɹˈʌst fɹʌm jˈuːzɪŋ ðə pɹˈɛʃɚɹˌaɪzd fjˈuːəlz kᵻnˈɛɾɪk ˈɛnɚdʒi tə sˈʌk ɪnðɪ ˈɛɹ ænd kəmpɹˈɛs ɪt pɹˈaɪɚ tə kəmbˈʌstʃən.
Early prototypes produced very small amounts of thrust, before Gluharev developed it from early experiments on producing thrust from using the pressurized fuel's kinetic energy to suck in the air and compress it prior to combustion.