| Design | R. Kosin, R. Schomerus |
| Year of construction | 1933/1936 |
| Materials | Wood, plywood, silk |
| Wingspan | 12m |
| Wing area | 11,4m² |
| Basic empty weight | 54 kg (D-28a), 72 kg or 83 kg (D-28b) |
| Seats | 1 |
| Special features | Exceptionally lightweight. D-28a and heavyweight D-28b were also built. 1934 crosscountry worldrecord of 240 km. Planned route flight Darmstadt-Saarbrücken of 140 km on 8.March 1935. |
