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Stromburg, Stromer and Stromerle

Some photos and explications to the tailles wing concept "Stromburg"

by Michael Schönherr  info@m-schoenherr.de

 

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The first 5m- Stromburg with central elevator and ailerons without slots.

Nurflugel-meeting Tannheim September 1986

 

 

 

 

The first Stromburg had best performance but sometimes unacceptable stalling characteristics. Shaping the elevators with slots as "external airfoil flaps", elsewhere called "Junkers doublewing" was the solutio.

Weiler/ Monzingen September 1986

 

 

The modified 6 m- "Stromburg E" with extended middle-section and external airfoil flaps at the wingtips.

A Super 8 Nizo movie-camera is just being prepared for wool fiber tests.

Stromberg, Summer 1987

 

Book:

 

"Faszination Nurflügel"

 

The criteria for designing a Nurflugel with "M-V- form" are described

 

(1988)

 

 

 

Stromburg E passing by in low level flight with 1.5 kg Photo camera on board. Today the ailerons are elongated in the direction to the inner side of the wing. At the droop-tips they lie now in the trapezoidal wing shape but are still designed as external airfoil flaps.

Tannheim, Nurflugel meeting September 1988

 

The Stromburg utilized the special lift-distribution in the center of swept wings, also called "mid-effect". For investigating that phenomenon we filmed wool fiber experiments on board . Left: Approaching the airfield of Tannheim at foen-conditions. We used the Nurflugel-meeting in 1988 also for testing!

 

 

 

 

For the very stable flying Stromburg E it is no problem to thermal in a distance up to 1000 m. Her 6 m wing span comes up to the half of a manned sailplane!

Manubach, spring 1987

 

 

The biggest and the smallest radio controlled Stromburgs. The big one with mounted video camera before half-hour filming. the former 3 min. film-camera was out.

Duchroth, southwest-hill, about 1991

 

 

Freeflight "Solarstromerle" (Solar flyer)

Stromberg 1987

 

 

Solarstromerle with one blade airscrew, equilibrated by an opposite positioned weight. The ready to fly model weighed only 45 grams. Wingspan 70 cm

1988

 

 

 

With 4 small solar cells Stromerle performed slow climbing flight paths , which flattened when curving. This was desired, otherwise he would buzz off. So after some circles he landed as requested. The Stromburg-concept is suitable for solar flight because there are no shading wingtips as with other flying wing types.

 

 

 

 

The 3.7 m allround glider "Stromer" over the east-hill of Duchroth.

Mai 1989

 

 

First aircraft towing of the Stromer.

Simmern, summer 1989

 

 

The 2,7 m Nurflugel "Stromschnelle" (means "rapid"). It was designed for high sweep angle (35°) high maneuverability and high strength as well as for step-free wing adaption (section and washout) to low and high speed flight. This was largely successful. Despite the high wing load "Stromschnelle" can fly comparatively slow and fast until sustained vertical dives

 

 

 

 

 

In the foreground the 6 m Stromburg, she will soon be towed by the big Wilga (left) up to 500 m. Behind Stromburg a modified 4.3 m Stromer with aspect ratio 23. Far back Werner Boder with his yellow 4 m Stromer. Since 1991 the ailerons of the bigger versions are elongated over the droop tips- angles as it can be seen on Werner´s wing (red coloured flaps).

Simmern, Mai 2001

 

 

 

The 1,6 m "Foto-Stromer" for the archaeological prospection.

The Plettenberg-drive 220/25/5 with a 14 x 9,5 airscrew and 10 x 800 mAh cells lifts the 1,5 kg total weight with a flight angle of 45° to the sight limit at about 250 to 300 m altitude. Then the photos are shot during glideing flight with motor off. If wished, the basic altitude can be achieved several times. In the one year period 2000/2001 "Foto-Stromer" performed about 50 accident-free photo flights and shot about 1000 air photos, among them several ones with new archaeological detections*. The original model was a 700 g electro-glider from 1998 with a speed 400 gear drive, 13 x 7 airscrew and 10 x 500 cells. Here the link back to the air-photos: LuftbilderE

--------------------------------------*published in "Aerial Archaeology by Remote Controlled Micro Aircraft" AARGnews 23 (September 2001)

 

 

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