A current trend in sailing sports is the use of boats equipped with hydrofoils, allowing the boats to “fly” over the water surface. In this situation, the handling of the boat requires fine coordination between the crew members to maintain the precarious flight. The purpose of this case study was to analyze the crew activity on a flying multihull and explore the role of the shared sport equipment in the emergence of coordination between crew members. Data were collected during a training session with a crew of expert sailors. A joint analysis of phenomenological and mechanical data was conducted. The aim of the analysis was to categorize the forms of interactions between crew members, boat and environment. Results showed that collective coordination in the studied situation involves six forms of interaction that are associated with stable, unstable or critical states of the flight. Consequently, we discussed the role played by the crew members, the behavior of the boat and the environment in the collective coordination.

• Coordination between crew members on a flying sailing boat includes six forms of interaction going from individual interactions of each crew members with the boat and the boat environment to social interactions between crew members.

• On flying boats, as in rowing, the shared sport equipment actively participates in collective coordination. Similarities and differences in the role played by the boat are discussed in this paper.

• This study encourages joint consideration of experiential data from the athletes and measurement data from the shared sport equipment to understand collective coordination in highly equipment-dependent sports.