 A four-engine variant would launch with four engines firing and shut down two engines 146 seconds after launch.The remaining two engines would burn until first-stage shutdown 212 seconds after launch.This variant could put approximately 132,000 pounds into a 100 nautical mile (185 km or 115 statute mile) orbit, versus around 250,000 pounds for the three-stage Saturn V.

The three-engine variant would burn all three engines up to first-stage shutdown at 146 seconds after launch.