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FS5/FSFS Sonex Homebuilt. The Sonex is a basic and economical all metal two place monoplane. Designed to meet the needs of the European and domestic markets, it can incorporate various light weight contemporary engines of 80 to 120 hp. Features include: conventional or tricycle landing gear and easily removeable wings for transport and storage. Outstanding performance is achieved through its clean aerodynamic shape and simple, light weight construction. By Jerry Arzdorf.