Abstract: A high-speed air-supported vehicle capable of multiple mode operations as both a water-contacting vehicle and an aircraft includes an aero roll-stabilizing plan form, a stabilizing ski/hydrofoil below a planing surface of a hull portion of the aero roll-stabilizing plan form for providing stabilization and lift to the plan form in at least one mode of operation, the ski/hydrofoil being mounted to a front underside of a hull portion of the aero roll-stabilizing plan form and being mounted forward of a center of gravity of the plan form, whereby a leading edge of said plan form is kept at a substantially constant level with respect to a surface of water during at least one mode of operation. A stabilizing ski provides stabilization and lift in at least one mode of operation. A flexible ski mount is provided for mounting the stabilizing ski to the aero roll stabilizing plan form.