|Komet, Merkur, and related|
|Dornier B-Bal "Merkur" of Ad Astra Aero S.-A.|
The Dornier Komet ("Comet"), Merkur ("Mercury"), Do C, Do D, and Do T were a family of aircraft manufactured in Germany during the 1920s, originally as small airliners, but which saw military use as well. The earliest aircraft in the series were basically landplane versions of the Delphin flying boat, and although the Delphin and Komet/Merkur series diverged from each other, design changes and refinements from one family were often incorporated into the other.
Design and development
The first Komets (Do C III Komet I) utilised the same rectangular plan, 17 m (55 ft 9 in) span wing, tail, and even upper fuselage, as well as the 138 kW (185 hp) BMW IIIa engine of the Delphin I, but replaced the lower fuselage and sponsons with a simple sheet-metal bottom that incorporated fixed tailskid undercarriage. The engine installation was also relocated from its peculiar position above the Delphin's nose to a conventional location in the Komet's fuselage nose. Accommodation was provided for a single pilot and four passengers. An improved version, the Do Komet II, was first flown on 9 October 1922 and was widely exported to countries including Colombia, Spain, Switzerland, and the Soviet Union.
The Do Komet III of 1924 was a practically all-new design that shared many elements with the Delphin III. The cabin was expanded to seat another two passengers and the larger wing, with a span of 19.6 m (64 ft 4 in), was raised above the fuselage on short struts. Power was greatly increased from the Komet I, with a 340 kW (450 hp) Napier Lion engine. This version was exported to Denmark and Sweden, but was also produced under licence in Japan by Kawasaki.
In 1925, the Komet III was replaced in production by the Do B Merkur I, which featured a revised fin and longer-span wings. When fitted with the BMW VI engine, it became known as the Do B Bal Merkur II, as did indeed any Komets thus re-engined. The type was widely used by Deutsche Luft Hansa, which had some 30 Merkurs operating at one time, and was also exported to Brazil, China, Colombia, Japan, and Switzerland.
The Do C and Do D were follow-on military designs, the former a trainer exported to Chile and Colombia, the latter a floatplane torpedo-bomber built for the Yugoslav Royal Navy. The designation Do T was used for a landplane ambulance version.
- Do C III Komet I
- First of the Komet series
- Do Komet II
- Do Komet III
- larger, more powerful four-six passenger version.
- Do B Merkur I
- Do B Bal Merkur II
- Do C
- Military version of the Komet III
- Do C-1: Two-seat fighter.
- Do C-2A: Recognition version.
- Do C-3: Recognition version.
- Do C-4: Do-10, development of C-1.
- Do D
- A much revised floatplane torpedo bomber version for the Royal Yugoslav Air Force
- Do T
- An ambulance version
Specifications (Merkur II)
Data from European Transport Aircraft since 1910
- Crew: one
- Capacity: eight passengers
- Length: 12.5 m (41 ft 0 in)
- Wingspan: 19.6 m (64 ft 4 in)
- Height: 3.56 m (11 ft 8 in) 
- Wing area: 62.0 m2 (667 sq ft)
- Empty weight: 2,100 kg (4,630 lb)
- Gross weight: 3,600 kg (7,937 lb)
- Powerplant: 1 × BMW VI water-cooled V-12 engine, 450 kW (600 hp)
- Maximum speed: 200 km/h (124 mph; 108 kn)
- Cruise speed: 180 km/h (112 mph; 97 kn)
- Range: 750 km; 405 nmi (466 mi) 
- Service ceiling: 5,200 m (17,100 ft)
This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (July 2011) (Learn how and when to remove this template message)
- "Les avions Dornier". Les Ailes (8): 2. 11 August 1921.
- Serryer, J (19 February 1925). "L'Avion Dornier "Komet" III". Les Ailes (192): 2.
- Hooks Aeroplane June 2016, p. 52.
- Hooks Aeroplane June 2016, p. 51.
- Hooks Aeroplane June 2016, pp. 52–53.
- Hooks Aeroplane June 2016, pp. 51–52.
- Stroud 1966, p. 246.
- Donald 1995, p. 347.
- Stroud Aeroplane Monthly January 1984, p. 39.
- Donald, David, ed. (1997). The Encyclopedia of World Aircraft. Leicester, UK: Blitz Editions. ISBN 1-85605-375-X.
- Hooks, Mike (June 2016). "Dornier Rising". Aeroplane. Vol. 44 no. 5. pp. 48–53. ISSN 0143-7240.
- Stroud, John (1966). European Transport Aircraft since 1910. London: Putnam.
- Stroud, John (January 1984). "Wings of Peace—Part 4: Dornier Komet and Merkur". Aeroplane Monthly. Vol. 12 no. 1. pp. 34–39. ISSN 0143-7240.
- Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. p. 327.
- World Aircraft Information Files. London: Bright Star Publishing. pp. File 892 Sheet 26.
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