| Type |
Four seated touring plane |
| Engine |
1 Siemens Sh 6 |
| Dimensions |
Length 7.70 m, height 2.25 m, span 13.00 m, wing area 22.50 m2, aspect ratio 7.5 |
| Weights |
Empty 490 kg, fuel 105 kg, oil 5 kg, load 410 kg, flying weight 900 kg, wing loading 40.0 kg/m2 |
| Performance |
(Estimated) Max. speed 150 km/h, cruising speed 130 km/h, service ceiling 3000 m, range 650 km, landing speed 70 km/h |
The DP III was followed by a DP IV design as a four-seater touring aircraft with a take-off weight of 900 kg and a Siemens Sh 6 engine with 100 hp. However, it remained at a rough draft.
The Dietrich DP.IV was the second of three aircraft developments designed for commercial use. It was intended as a medium-sized, four-seater feeder aircraft for Dietrich-Gobiet Luftverkehr GmbH. Erich von Knüpffer's design was abandoned at an early stage of the project. A prototype was not built.
The design was created under Knüpffer's direction in 1924 as an open, bracing-free low-wing aircraft with a mixed construction. The square fuselage was designed as a fabric-covered steel tube construction, while the one-piece, two-spar wing was designed as a wooden construction. To save space in an aircraft hangar, the wing could be pulled out of the fuselage in less than two minutes.
In the cockpit area, the fuselage was widened to accommodate a 1.25 m wide bench seat for two people sitting next to each other. Two of these benches were arranged one behind the other, with the front bench at the aircraft's center of gravity. The aircraft was powered by a 100 hp Siemens & Halske Sh6 engine.
With a range of 500 km, the DP.IV was suitable both as a commuter aircraft within a range of 150-200 km and as a business jet over longer distances.
