Developing an innovative and high‑performance method for recovering reusable launcher stages: the in‑air capturing method

Abstract

In this paper, the research within the Horizon 2020-funded project FALCon on the innovative “In-Air Capturing” (IAC) method is presented. This recovery method for reusable rocket stages involves capture of a winged launcher stage with an aircraft in a gliding flight at subsonic velocity. Hence, the IAC procedure involves multiple vehicles interacting in a highly dynamic and complex environment, which requires detailed investigation before being used in a future full-scale setup. First, this paper gives an overview of the implications of using the IAC method on launcher system design. Second, the subscale flight testing with unmanned aerial systems (UASs) is explained. An analysis of all full-scale systems involved is also conducted, including the towing aircraft, an aerodynamically controlled capturing device that is connected via a rope to the aircraft, and the RLV stage. CFD simulations are conducted to understand the implications of the flow field around the vehicles and their impact on the IAC maneuver. Next, some full-scale trajectory simulations for different maneuvers involved in IAC are produced. The trajectory is also evaluated for subscale flight simulations, wherein the data acquired during flight tests is used. Finally, the progress and potential future outlook for this recovery method are described.