X-Plane 8 And 9 Scheibe SF-25B Falke. The Scheibe SF-25 Falke (English: Falcon) is a German touring motor glider developed from the earlier Bergfalke glider by Scheibe Flugzeugbau. The small (48 Hp) engine is not meant for take-off (but you can if you wish) or for cruising for a long time. It is meant for picking up altitude if you get too low and do not find thermals nearby. Make sure you have set-up thermals in the weather menu as soaring without them is a bit difficult! See instructions in the Readme file on how to set up appropriate weather conditions and situations. By Jacques Brault.