RD-170

NPO Energomash RD-170 is a four-chamber oxidizer-rich staged-combustion LOX/kerosene booster engine developed for the Energia heavy-lift launch vehicle and later used on Zenit-family first stages. NASA records throttling and reusable design intent, 1,632,000 lbf sea-level / 1,777,000 lbf vacuum thrust and 309 s / 337 s specific impulse; lifecycle remains retired because no current operational service is evidenced.