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New wind tunnel measurements published

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BLOG - THE GOSSIP

Monday, July 06, 2020

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New wind tunnel measurements published

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Aniprop Blog Header

The company Aniprop in Göttingen who is well renouned for his pioneering work developing FESTO Smartbird got noticed about our work and finally offerd us to make tests in their wind tunnel. We therefore created a new profile exclusively for these tests. The profile was made from wood and other light materials carring the aeroflexible surface.

Data of Measurement

Wing depth

300mm

Wing width

820mm

Re

7,9 E+04 ... 1,49 E+05

u0

4 m/s ... 7,5 m/s

cA_max

2,01 (4m/s) ... 2,068 (6m/s)

Gliding ratio

ϵ = ~53

Wind tunnel height

800mm

Wind tunnel width

1100mm

Force measurement

2-dinemsional 3 point measurement, Force measurement cylinder

drive & control of attack angle

step motor 1,8°/step

In the first Run we measured at different attack angles and zero wind speed to have a reference for the balance point. Then after several runs at different speeds we gained polar diagram curves showing us the performance of our wing. Luckily the results turned out to be better than expected. at every speed we measured our cA (german) / cL (english) parameter produced values above 2.0 which is actually a very high value. Usually good airfoils create a cL of around 1.5.
When measuring the cW (german) / cD (english) parameter we had an rather strange result that this parameter turned out to be slightly negative at his best point. The results were so far independent from the cL parameter. By shifting the force center a few millimeter away from the measured force center in the first run the cD values could be corrected to more plausible values. Thus cD so far remained unclear.

Polardiagramme AFAX-4ms2D 02 xs

Image 1: Polar diagram comparing conventional Airfoils (violet) with aeroflexible Airfoils (blue+green)

The comparison of the blue and green curves in the polar diagram shows another interesting feature and is another evidence of the performance of the aeroflexible surface. The green curves indicates a profile which has only a partial aeroflaxible coating while the blue curve indicates a profile which is entirely coated with an aeroflexible surface.

Finally we would like to thank Dr. Wolfgang Send for his support and contribution to our aeroflexible project.

 

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felixschaller.com
Bergstr 8
85567 Grafing
+49-8092-2302-856
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Skype: ftc-creative


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Münchner Merkur

Schaller's technology can not only applied on wings of future aircrafts but also increase the power outout of wind turbines. with bionic propellers from less wind more electrical energy can be obtained.

Münchner Merkur
( Newspaper )

Mario Bicher

To change the perspective and to break out of the familiar, that's what also Felix Schaller feels obliged. For his work and reflections on Bionic Wing Construction he received the Querdenker Award in November 2012

Mario Bicher
( Editor in chief / Modell-Aviator )

Saschka Unseld


Top qualities: Personable, On Time, High Integrity

Saschka Unseld
( Artist, Pixar Studios )

Michael Banks

I would highly recommend Felix to any potential employer as he not only holds a vast array of skills and talent in relation to 3D but works well within a team environment. I found him easy to get along with, which was echoed through his immediate peers working at the time on the Odd Socks project.

Michael Banks
( Asset Mgr. - Photonvfx.com )

Nir Loewenberg

I worked with Felix on several commercial projects at suedlich-t. Felix has very good lighting and shading skills but also good rigging skills. It was easy to get along with him, on a personal and professional level.

Nir Loewenberg
( 3d Digital Artist / Südlich-t )


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