The modular foil includes a wing and a fuselage extending in a longitudinal direction and bearing the wing. The fuselage includes a central segment, a first segment bearing a first portion of the wing, and being removable from the central segment, and an assembling device to connect the central segment with the first segment in the longitudinal direction. The central segment and the first segment are connected end to end. The assembling device includes a pair formed by a male connector and a female connector cooperating through a specific interlocking. The male connector includes at least one outer inclined wall, complementary and cooperating with an internal inclined wall born by the female connector for an optimal interlocking between the central segment and the first segment. There is a locking device along the longitudinal axis of the fuselage ensuring locking in at least one direction of the longitudinal axis.