Dornier pursued the clandestine development of military aircraft, including the DoH Falke and Seefalke all metal cantilever high wing fighter monoplanes in 1922 and the DoD twin float torpedo bomber monoplane in 1926.
Manufactured at Altenrhein / Pisa, the Do.H was a relatively modern design. Fitted with floats, the Falks was available a sea-based fighter, too. Several engine variants existed.
In cooperation with Wright, the Wright H3 was fitted and the Falke offered to the US-Navy.

Dornier H Falke
Engine : BMW IV a, 296 hp
Length : 24.377 ft / 7.43 m
Height: 9.318 ft / 2.84 m
Wingspan : 32.808 ft / 10.0 m
Wing area : 215.28 sq.ft / 20.0 sq.m
Max take off weight : 2646.0 lb / 1200.0 kg
Weight empty : 2039.6 lb / 925.0 kg
Max. payload weight : 110.3 lb / 50.0 kg
Max. speed : 140 kts / 260 km/h
Landing speed : 49 kts / 90 km/h
Cruising speed : 119 kts / 220 km/h
Initial climb rate : 1161.42 ft/min / 5.90 m/s
Service ceiling : 25591 ft / 7800 m
Wing load : 12.30 lb/sq.ft / 60.00 kg/sq.m
Range : 259 nm / 480 km
Crew : 1
Armament : 2x MG

These aircraft were three of a large family of civil/military aircraft produced in the late 1920s, and surviving documentation on their design and weaponry is both sparse and conflicting, due to the fact that Germany was officially an ‘unarmed’ country at that time.

Dornier Komet Article

Development began in 1920 with the Do C III (Komet I). This was a high wing commercial transport with an open cockpit for the pilot and an enclosed cabin seating four passengers. It had an exceptionally long wingspan of 17 m (55 ft 9.25 in) and could be powered by either a 180 hp BMW III or 185hp BMW IIIa engine. It was built in small numbers and used by various German airlines with some success.

Designed in 1920 a modified version, the Komet II, utilized the same wing configura¬tion, but with an increased overall length. The Komet II was a five-seat (pilot in open cockpit and four passengers in cabin) monoplane with a thick wing placed on top of the deep box-section fuselage. Powered by a 134kW / 250 hp BMW IV engine, it made its first flight on October 9, 1922.
A small number were built with 250 hp BMW IV engines and were operated from 1922 by Deutsche Luft-Reederei, and Rolls-Royce Falcon-engined examples went to Spain, Colombia, Russia and the Ukraine.
This was followed by the six passenger Komet III, which first flew on December 7, 1924, with a 360 hp Rolls Royce Eagle powerplant. This same engine was used in a parasol wing development, the Do C, produced shortly afterwards as a training air¬craft. Some Do Cs were operated by the Fuerza Aerea de Chile as light bombers in about 1930.

The Do D torpedo bomber, which flew for the first time in July 1926, was a twin float version of the Do C, with a 600 hp BMW VI engine, which entered limited production for the Yugoslav naval air service in 1927. In 1925, two other versions of the Kornet III were evolved: an ambulance model, designated Do T, and a passenger counterpart with a 600 hp BMW VI, the latter receiving the name Merkur (or Do B).

The final development of the Komet type was the Do.B Merkur, which first flew in February 1925 and was produced from 1926 as an eight-ten passenger airliner powered by a BMW VI engine. It could cruise at 175km/h. Following long-distance overland trial flights, dual controls and adjustable pilot seats were fitted. Deutsche Luft-Hansa received the greatest number with nearly 30 aircraft and these operated from Berlin to Konigsberg and elsewhere. Examples were operated by Deutscher Aero Lloyd and DDL in Europe, were exported to the Ukraine and licence-built in Japan and perhaps Switzerland in civil/military guises.

Aero-Lloyd Komet II D223 was the first German commercial aircraft to visit the UK since the First World War. It brought three Aero-Lloyd directors to visit Daimler Airways to finalise arrangements for a London-Berlin service. The Komet II had flown from Berlin via Amsterdam and Rotterdam, and due to bad weather landed in a field near Lympne, Kent, where crew and Passengers spent the night before arriving at Croydon Airport.
The Komet III used three different kind of powerplants. Some of them employed the Rolls-Royce 360 horsepower Eagles, others used the Napier 465 horsepower Lions, and the third powerplant was the 400 horsepower Liberty engine.

A twin-float seaplane version was also produced and Chile received a number as Do G trainers/torpedo-bombers. The Do D was similar to the Do C built for the Yugoslav Naval Air Service, while the Do T was an ambulance derivative of the Merkur.
The Merkur used a 600 horsepower engine as its powerplant.
Production details are impossible to give. It is known that the civil Komet and Merkur series, together with the Do T, were built openly in Germany; the para military variants most likely emanated from the Dornier factory at Alteirrhein in Switzerland.

Komet II
Engine: 1 x BMW IV, 185kW
Take-off weight: 2200 kg / 4850 lb
Empty weight: 700 kg / 1543 lb
Wingspan: 17.0 m / 55 ft 9 in
Length: 10.3 m / 33 ft 10 in
Height: 3.3 m / 10 ft 10 in
Wing area: 50.0 sq.m / 538.20 sq ft
Max. Speed: 165 km/h / 103 mph
Cruise speed: 135 km/h / 84 mph
Ceiling: 5000 m / 16400 ft
Range w/max.fuel: 500 km / 311 miles
Crew: 1
Passengers: 4

Do C
Span: 19.60 m (64 ft 3.75 in)
Length: 12.43 m (40 ft 9.5 in)
Gross weight: 3900 kg (8598 lb)
Maximum speed: 195 kph (121 mph)

Do.B Merkur
Engine: 1 x BMW VI, 500kW
Take-off weight: 3700 kg / 8157 lb
Empty weight: 2280 kg / 5027 lb
Wingspan: 19.6 m / 64 ft 4 in
Length: 12.8 m / 41 ft 12 in
Height: 3.8 m / 12 ft 6 in
Wing area: 62.0 sq.m / 667.36 sq ft
Ceiling: 5200 m / 17050 ft
Range w/max.fuel: 1000 km / 621 miles
Crew: 2
Passengers: 6-7