Trials indicated that twin propulsion was no better than the turbine engine which had been in development since 1968 at KB-3 of the Kirov Plant (LKZ) and at WNII Transmash.
نتایج نشان داد که نیروی دوقلو بهتر از موتور توربین است که از سال 1968 در KB-3 از کارخانه Kirov (LKZ) و در WNII Transmash در حال توسعه بود.