Musk Claims 8 Tankers Will Fuel Moon Lander, Not 22

Elon Musk stated on social media that six to eight Starship tanker flights are sufficient to fuel a lunar lander, directly contradicting a recent estimate of 22 launches. This dispute follows a quarterly meeting of the Aerospace Safety Advisory Panel held on Thursday, where members flagged the refueling process as a primary risk for the Artemis IV mission.

Artemis IV is scheduled to land a crew on the Moon in 2028. The mission relies on an orbital fueling system because a Starship rocket consumes nearly all its propellant to reach Earth orbit. SpaceX plans to launch a storage tank, or depot, into space first. Individual tanker ships will then launch, dock with the depot, and transfer their remaining fuel. Once the depot is full, the crewed lunar lander will dock to refuel before departing for the Moon.

The panel's estimate of 22 flights comes from calculations based on current Starship performance. Charlie Precourt, a former NASA astronaut and panel member, noted during the meeting that the team must monitor the numerous required fuelings. Precourt cited the 22-flight figure as the last estimate available to the group. Eric Berger, a reporter who shared Precourt's comments, calculated that even with a launch rate of two Starships per week by the end of 2027, filling the depot at that rate would take approximately three months.

Musk's lower estimate assumes a more capable version of the vehicle. The number of tankers required depends on the amount of propellant delivered to orbit and the losses that occur during transfer. Starship carries fuel and oxygen at extremely low temperatures, which causes some propellant to boil off while waiting in orbit. NASA's calculation appears to rely on current lifting capacity, while Musk's range accounts for the upgraded V3 Starship that SpaceX intends to use for refueling operations.

This is not the first time Musk has challenged higher launch counts. In 2021, he described a government estimate of 16 launches as extremely unlikely and predicted that eight tankers would be the maximum needed. Precourt acknowledged that Artemis IV involves a large number of firsts for the program. He also praised NASA Administrator Jared Isaacman for working to clear obstacles for both SpaceX and Blue Origin. Blue Origin's Blue Moon lander does not require orbital refueling for its initial mission.

The outcome will depend on the performance of hardware that has not yet completed a full flight profile for this specific task. SpaceX has not yet demonstrated the orbital refueling process with the V3 vehicle. The gap between the panel's 22-launch warning and Musk's 6 to 8 range highlights the uncertainty surrounding the logistics of getting a crewed lander to the Moon.