I didn’t consider wake turbulence between two light aircraft a major factor, but changed my mind after reading this accident report (unfortunately in German only).
The accident happened in Backnang-Heiningen EDSH where a Robin DR400 departed 39 seconds after an Antonov An-2.
Immediately after takeoff the Robin was caught in the wake vortex of the An-2, rolled 90 degrees to the right, crashed into the ground and burst into flames.
The An-2 is heavier and has a bigger wingspan, but with 5500kg still a light aircraft…
The BFU was able to reproduce the loss of control with a test pilot at a safe altitude.
This is shown in this video (German)
Wow! Is it possible that the AN-2 being a biplane produces unusually strong vortices?
As a heavy aircraft that flies slowly, is it all that surprising?
