Saturday, April 21, 2012

Austria - 1917 Lohner D.I 10.20 series 111

Some Times Life Just Gets Strange

Things have been hectic around the studio. I am supposedly officially retired and getting on with the work I choose. Unfortunately others I know seem to think since I am retired I have empty hours that I should fill with projects they want me to do for them. Add a internet connection issue and I have not had much chance to post or read the blogs of my friends. Hopefully things will settle down and I can get back to a normal (as normal as it gets in this madhouse) routine.

The Ill Fated Lohner D.I 10.20

I have previously posted one of the earlier prototypes of this type. I finally finished up the profile of the last incarnation of this design. Austria seemed to have a difficult time creating original designs which could compete with the aircraft of their enemies. They invested so much time and resources into inferior designs.

Lohner DI - 10.20 Type AA sn. 111.01

Lohner DI - 10.20 Type AA sn. 111.01 - 1917
Lohner DI - 10.20 Type AA sn. 111.01 - 1917

This is the original prototype, known as the type AA. Despite its sleek lines The performance left much to be desired. It was rebuilt with conventional wing struts and wires. This did yield any real advantage.

Lohner DI 10.20B sn. 111.02 - 1917

Lohner DI  10.20B sn. 111.02 - 1917
Lohner DI 10.20B sn. 111.02 - 1917

I had originally posted this profile a while ago. I include it here to show the evolution of the design. This nw build was the second attempt to solve the problems with the design. Once again the "I" struts have returned and the lines are still rather sleek. Unfortunately there was not much improvement in performance. As with the Type AA, the type B was retired.

Lohner DI 10.20 sn.111.03 - 1917

Lohner DI  10.20 sn.111.03 - 1917
Lohner DI 10.20 sn.111.03 - 1917

This is the final version of the Lohner D.I. Gone were the "I" struts and the fuselage was simplified. The rudder was smaller that the previous prototypes.

The Lohner Series 111 aircraft company was an Austria-Hungarian prototype single seat biplane built in 1917 by Lohnerwerke GmbH. The fuselage was a laminated wood construction. The wing struts were an "I" requiring no wires tor structural stability. Power was provided by an Austro-Daimler engine generating 185 hp (138 kW) The design went through several changes during the development process. Three prototypes were built. The performance of the aircraft was not an improvement on existing models already in production. Lackluster flight results led to Flars not approving the D.I for production.


  1. Grosz, Peter, the Austro-Hungarian Army Aircraft of World War One, Flying Machines Press, 2002, ISBN 1-891268-05-8

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