The Halberstadt D-series of single-seat fighters was developed from the unarmed B II reconnaissance two-seater, inheriting that type’s considerable structural strength. The D I appeared late in 1915 with a single interrupted gun and a powerplant comprising one 75-kW (100-hp) Mercedes D.l inline engine.
A two-bay biplane, the wings were of two-spar construction with fabric covering. The wooden fuselage, with plywood covering forward and fabric covering aft. There were no fixed tail surfaces. The ailerons, elevators and rudder were all fabric covered steel tube structures. Ailerons were on the top wing only.
The production model, of which few were built, was the D II with the more powerful Mercedes DII engine and a wing radiator in place of the original nose-mounted unit. About 100 were in service in January 1917.
The D.II was not easy to fly on account of the absence of any fixed or tailplane surfaces resulting in extremely sensitive controls.
These served for a few months from June 1916 before being supplanted by the D III, which differed mainly in its larger horn-balanced ailerons and as powerplant one 89-kW (120-hp) Argus Ash inline.
A few D IVs were produced for Turkey with twin guns and the 112-kW (150-hp) Benz Bz.III, entering service in 1917 as a single seat fighter. The DV of 1917 was a refined type with a more streamlined plywood-covered fuselage and the As.II engine.
Replica D.VI:
Swanson Halberstadt D.VI
Halberstadt D.I
Engine: l x Mercedes D.I, 75kW(100hp).
Halberstadt D.II
Engine: l x Mercedes D.II, 89kW(120hp).
Span: 8.8m (28 ft 10.5 in).
Length: 7.3m (23 ft 11.5 in).
Height: 8 ft 9 in
Empty weight: 1237 lb
Max T/O weight: 730kg (1,6l0lb).
Fuel capacity: 18.5 Imp.Gal
Max speed: 93 mph.
Operational endurance: 2 hr.
Armament: 1 x 7.92-mm (0.312-in) Spandau LMG 08/15 mg.
Halberstadt D.III
Engine: l x Argus Ash, 89kW(120hp).
Span upper: 28 ft 8 in
Span lower: 25 ft 8 in
Wing area: 256 sq.ft
Length: 23 ft 10 in
Height: 7 ft 9 in
Max speed: 90 mph at SL
Armament: 1-2 Maxim mg
Crew: 1
Halberstadt D.IV
Engine: l x Benz Bz.III, 112kW(150hp).
Armament: 2 x mg.
Halberstadt D.V
Engine: l x Argus Ash As.II.
All Aero 