In the FMT ("Flugmodell und Techik" = flight model and technique) magazine June 2012, in an article
about flight stabilisation systems (for RC models!) research for a gust alleviation system by Dornier
during the early '80s is mentioned, including graphics and a photo of a wind tunnel model, which was
used for those tests. It looks quite similar to the Do 28 TNT, but still has some distinctive differences:
The nose is more blunt, the tail is lower and the engine nacelles are shorter. An early model or another
type ?