Mon, Sep 23, 2:31 AM CDT

Probably the very first ever blended wing body

Other Apps Aviation posted on Jul 30, 2014
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Description


The basic idea of the revolutionary and highly innovative blended wing body is actually more than 100 years old. In 1910, Hugo Junkers got his patent for a thick wing providing space for payload, crew and engines. From 1915 on, this idea paved the way to the cantilever monoplane. However, it took until 1930, before airplanes grew so big that even wings with exceptionally thick airfoils were high enough to walk within them. Most well known being Junkers´ G-38 and Tupolew´s ANT-20 Maxim Gorkij. And now, the concept of a swept flying wing with low aspect ratio and strong tapper which can accommodate the payload in its center section has already been discussed for more than 25 years. Funnily, the minimum number of paxes or amount of payload, respectively, that is considered to be necessary to make such a concept work has not changed since then. Now this is how one of the aircraft might have looked as proposed in Junkers' international patent specification as issued by October 20th, 1914: A biplane with a thick lower wing and kind of a parasol above it. Insofar it does not contribute to his main merit considering the cantilever monoplane. With the thin upper wing being more a cambered plate than anything else and the the thin tail booms a considerable amount of wiring should still have been necessary. The large single propeller was intended to be driven by two engines located on either side of the cockpit in the center section. Power transmission via flat belts fits better into the time than shafts an bevelboxes. In front of the engines, there should be enough space left for passengers enjoying the great view out of the wing nose. Further outboard, baggage compartments are accessible through large cargo doors in the nose, meanwhile the the wing tips content the fuel tanks. As it is not clear how the tail was intended, I used the artistic freedom resulting from that. Probably, a single fin of this size would not have been sufficient anyway. The big horizontal stabilizer should be necessary as well to get rid of the pitching moment of the strongly cambered wide cord box-wing. Meanwhile rudders and elevator are conventional flaps, rolling is to be applied by torsion of the upper wing via the two pairs of wires. Airfoils: All by conformal mapping (Shukowskij 1.1 running under CVI LabWindows) Grapher 2.03 AutoCAD 2011 Corel PhotoPaint 7 (only for resizing and copying together) Notepad

Comments (4)


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woodywoo

10:53AM | Wed, 30 July 2014

Very cool modeling

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steelrazer

11:45AM | Wed, 30 July 2014

Nice modeling job, and fascinating information. Everything new is old!

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Stringy

6:26AM | Fri, 01 August 2014

Wondering how it would fly in Xplane. Never realised the swept wing concept was that old. Great job on the model.

Blechnik

7:36AM | Fri, 01 August 2014

Just try the Xplane! Swept wing? These are exactly straight at the quarter-chord-line! However, the first use of swept wings to ensure longitudinal stability with a tailless aircraft was done by Dunne in that time too. Meanwhile the idea of the swept wing in compressible flow was first mentioned by Busemann on the Volta-conference of 1935. The wheelchairgeneral

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e-brink

1:01PM | Sat, 20 September 2014

A fascinating design. Nicely shown.


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