A main foil system with the foil area divided into two, either to facilitate retraction, or to permit the location of the control surfaces well outboard, where foil control and large rol- correcting moments can be applied for small changes in lift. Found on http://www.encyclo.co.uk/local/20083
A main foil system with the foil area divided into two, either to facilitate retraction, or to permit the location of the control surfaces well outboard, where foil control and large rol- correcting moments can be applied for small changes in lift.