Engine costs for reusability

The advanced Launch System (ALS) program goals demand an order-of-magnitude reduction in costs over existing launch vehicle propulsion systems. Studies suggest that reusable engines provide cost advantages over expendable propulsion systems. Early studies are quantifying operations costs, and cost sensitivities to engine production and operations variables. ALS production and operations philosophies enhance the potential of an affordable, operationally flexible launch vehicle propulsion system. The assumptions made and criteria set during the initial planning for the operations phase of the ALS highlight the changes for implementing such a system.