Hirth Schempp-Hirth Flugzeugbau Schempp-Hirth Discus Hirth Motoren Herbert Hirth Hirth HM 500 Friedrich Hirth Hirth HM 504 Georg Hirth Hirth HM 508 Schempp-Hirth Discus-2 Schempp-Hirth Nimbus-4 Hirth HM 506 Schempp-Hirth Duo Discus Jean-Joseph Hirth Hirth HM 60 Hirth HM 501