Danish Naval Air Service Flying Boats


Any landing you can walk away from, is a good one.
13 January 2009
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I am trying to update my database and have come up against a wall.

Does anyone have any information on the flying boats built by the Orlogsværftet for the Danish Naval Air Service between 1919 and 1920.

The designations for these are are follows:


Any information would be helpful.

You may already have the following from online sources. If not, I hope it is useful or of interest.

The latter has photos of the F.B. I, F.B. III, F.B. IV, and H.B. I. Different images of the F.B. I, F.B. III, and H.B. I appear on Johnny Balsved's Danish Naval History site. The restored F.B. I is on the Teknisk Museum site.

Orlogsværftets OV-flyvebåde F.B. I

The OV-flyvebåde F.B. Is were really the two Donnet-Lévêque boats imported in 1913. These two-seat, trainer/scouts (built by Franco-British Aviation Co, Paris) were originally named "Mågen" (Seagull) and "Ternen" (Tern). (Mågen becomes a generic name for all Marinens Flyvevæsen flying boats, later combined with an airframe identifying number.)

In 1914, Orlogsværftets rebuilt and re-winged the Donnet-Lévêque boats (reportedly improving flight characteristics). At this stage, the names "Mågen 1" and "Mågen 2" were applied. (On 12 Sept 1915, "Mågen 2" was dropped from a hoist at Copenhagen and the damaged airframe was later discarded.)

In 1921 Orlogsværftets, received the rights to the design and the designation F.B.I (Flyvebådsbiplan I) was retrospectively applied.

Engine 80 hp Gnome-Rhône rotary
Span 11.6 m
Length 7.90 m
Empty 439 kg
All-up 707 kg
Max. 100 km/h

Orlogsværftets OV-flyvebåde F.B. III

The F.B. III was an original flying boat design of the same single-engined, pusher layout as the Donnet-Lévêque design and the serving F.B. II. The first the F.B. III was completed in October 1915. Ten airframes were produced, all which served at the Flyvebåds station in Copenhagen. The type was in service from 1916-to-1924. The F.B. IIIs were powered by a range of engines.

Engines 100 hp Curtiss OV-type V-8, 100 hp Gnome-Rhône Monosoupape rotary, 100 hp Mercedes D.I 6-cylinder inline
Armament 1 x 8mm Madsen machine gun, 4 x 9 kg light bombs
Max. weight: 975 kg
Span - 11.18 m
Length - 8.49 m

Mågen 4/14, O.V.3, 100 hp Curtiss, lost N. of Sjælland, Fall 1916
Mågen 14(2), O.V.18
Mågen 5/12, O.V.6, 100 hp Gnome Monosaupape
6/11, O.V.7, 100 hp Mercedes, crashed at Avedøre
Mågen 11(2), O.V.13
Mågen 15, O.V.9
Mågen 16, O.V.11
Mågen 17, O.V.20
Mågen 18, O.V.16
Mågen 19, O.V.17

Orlogsværftets OV-flyvebåde F.B. IV

The F.B. IV was a more powerful version (200 hp Curtiss) of the F.B. III. Only two airframes were built but the numbering is confusing. The original Mågen 21 (O.V.15, May 1917) was replaced by another Mågen 21 (O.V.21, July 1918). In September 1918, Mågen 22 (O.V.23), was created by rebuilding the original Mågen 21/O.V.15.

No Specs available

Orlogsværftets OV-flyvebåde F.B. V

The F.B.V were three unarmed trainer versions of the F.B. III. Used by the Marinens Flyveskole from 1919 to 1921. Dimensions as per F.B. III. Powerplant was a 100 hp Curtiss OV-type V-8.

Note that Orlogsværftets applied serials without the "Mågen". Normal MF service number were applied as shown below:

Nr.6, O.V.26
Nr.7, O.V.28
Nr.8, O.V.29, crashed 20 July 1920

Orlogsværftets OV-hydro biplan H.B. I

The four H.B. I "pontonmaskiner" served as recce/trainers alongside the flying boats at FBS Kbh (Flyvebådsstation København) from September 1918 to February 1924.


Engine: 1 ea Curtiss 160 Hps. (later replaced by the 160 Hps. OLV engine)
Armament: 1 x 8 mm Madsen LMG, 4 x 7.5 kg bombs
Max. 100 km/h
Loaded 1,600 kg
Span - 15.16 m
Length - 10.05 m
Height - 3.85 m

23/14, O.V.22
24, O.V.24, crashed 19 April 1919
25/15, O.V.25
26/16, O.V.27
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