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#1 yomgui Aug 27, 2011 08:43 AM

pictures of the wind tunnel
 
Entrance cone of the wind tunnel:

http://g.rouby.free.fr/images_WT/IMGP0704.JPG

Even the belt was not enough to curve the four parts in the right position!
The curve is simply parabolic function.
The entrance cone is kind of too short, but I needed place…

http://g.rouby.free.fr/images_WT/IMGP0705.JPG

Inner side surface is not perfect.

http://g.rouby.free.fr/images_WT/IMGP0706.JPG

Build up with some improvisations.

http://g.rouby.free.fr/images_WT/IMGP0707.JPG

The “honeycomb” (balsa) was a bit complicated to make and is still a problem, slowing down the airflow but much better for steadiness (believe or not!).
The anemometer used as reference for speed measurement:

http://g.rouby.free.fr/images_WT/IMGP0708.JPG

Speed is only around 53 km/h in the test room, limited by the low pitch of the wind tunnel propeller(s) and the poor performance of the motor that spinning it.

http://g.rouby.free.fr/images_WT/IMGP0710.JPG

The entrance cone should be easy to remove and replace.

The door of the test room:
http://g.rouby.free.fr/images_WT/IMGP0711.JPG

USB cable:
http://g.rouby.free.fr/images_WT/IMGP0712.JPG

This is just to prevent the door from falling when speed comes back to zero:
http://g.rouby.free.fr/images_WT/IMGP0713.JPG

Pitot tube installed for “velocity distribution” tests:
http://g.rouby.free.fr/images_WT/IMGP0714.JPG

From upside:
http://g.rouby.free.fr/images_WT/IMGP0716.JPG

Exit cone from the inside:
http://g.rouby.free.fr/images_WT/IMGP0720.JPG

Wind tunnel motor speed control:
http://g.rouby.free.fr/images_WT/IMGP0721.JPG

Exit cone:
http://g.rouby.free.fr/images_WT/IMGP0723.JPG

2800 tr/min, rated 900 W dead lawn mower motor and 2 graupner 20x12 props (needs 4 blades 20x20 and a good motor).
http://g.rouby.free.fr/images_WT/IMGP0724.JPG


http://g.rouby.free.fr/images_WT/IMGP0727.JPG


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