Starship Logistics: Musk Counters NASA Panel With Lower Fuel Count

Elon Musk has rejected a recent estimate from a NASA safety panel regarding the number of Starship launches required to fuel a lunar lander. The SpaceX CEO stated that the actual figure will be between six and eight tanker flights, a number he described as far lower than the projection cited by government advisors.

The discrepancy surfaced during a quarterly public meeting of the Aerospace Safety Advisory Panel held on Thursday. Charlie Precourt, a panel member and former NASA astronaut, identified the refueling process for the Artemis IV mission as a primary risk factor. Precourt noted that previous estimates suggested approximately 22 flights would be necessary to fill the lunar lander's tanks for the 2028 crewed mission.

Following the publication of Precourt's remarks, Musk responded on social media to challenge the high count. He wrote that the 22-flight figure was excessive and that his team projects a requirement of only six to eight tankers. This new range aligns with a position Musk took in 2021, when he dismissed a government document suggesting 16 launches and asserted that eight would be the maximum needed.

The logistical challenge arises because Starship consumes nearly all its propellant during ascent to Earth orbit. To reach the Moon, the vehicle requires an orbital fuel depot. Under the proposed system, a storage tank version of Starship launches first, followed by tanker versions that dock and transfer propellant. Once the depot is full, the lunar lander departs for the Moon. Each tanker flight represents a full rocket launch, adding time, cost, and potential failure points to the mission timeline.

Estimates vary based on assumptions about Starship's capability and fuel efficiency. NASA's higher count appears to rely on the rocket's current lift capacity. Musk's lower range assumes a more advanced vehicle. Additionally, propellant loss occurs as liquid fuel and oxygen boil off in the cold of space and during transfer operations between spacecraft.

Eric Berger of Ars Technica calculated that even with two Starship launches per week by the end of 2027, filling a depot at the panel's 22-flight estimate would take roughly three months. Precourt acknowledged that Artemis IV involves numerous firsts, including the use of the upgraded V3 Starship for refueling operations. He also credited NASA Administrator Jared Isaacman's team for working to clear path obstacles for both SpaceX and Blue Origin, whose Blue Moon lander does not rely on orbital refueling for its initial mission.