A novel method for active control of vortex breakdown by creating a virtual canard through forebody slot blowing has been investigated. This allows a higher lift performance of delta wing aircrafts without loss of roll control. A new analytical method of analyzing lifting surface shapes that are favorable for minimizing side force and roll moments due to vortex instability was also developed. New shapes were proposed that favors symmetric vortices formations on the leeward side of a lifting surface. The experimental study in wind and water tunnel confirms the analytical method and the proposed new shapes, which suggests that the analytical method can be a useful tool for exploring shapes that favor stability or instability.