At the beginning of the nineties, the design of the Rhein-Flugzeugbau Tiro-Trainer was developed under Christoph Fischer at Rhein-Flugzeugbau . It was to be equipped with a Williams Rolls-Royce FJ44 engine and use modern jacket screw technology, which Hanno Fischer had developed in the late eighties as part of the Whisperfan technology. He was offered to the Thai Air Force in 1994 as a replacement for the RTAF Fantrainer. [9]Rhein-Flugzeugbau was no longer able to implement the project after leaving the DASA consortium.