The Fieseler Fi-167 aircraft had a ridiculous amount of high-lift devices. It is said that Gerhard Fieseler during a demo sank the aircraft from 9800 ft to 100 ft, practically over the same spot while having full control over the plane. Ths is probably the aircraft with the most slats and flaps ever built. The Fi-167 had 2 automatic and independent slats on each wing – very exciting, but it will be hell to model. Not only were there a lot of high-lift devices, but they were also huge. A total of 10 percent of the chord is slats and 20 is flaps approximately.