OK, so its a bit too small for a bike and setup to measure lift rather than drag. I just wanted to share what my 16YO nephew built it for a science project. He did the construction and calculations himself, but of course it does help when your dad has a PhD is aerospace engineering… I really like the homemade manometer using windscreen washer concentrate mixed with food dye!
windsreen? what are you british? its a windshield. 
other than that its awesome.
Super freakin’ ultra awesome!
.
Kevin’s Australian. Hence the “wombat” nickname. So, yes, it’s a windscreen…
You could sell this to triathletes for the price of a new house.
Kevin’s Australian. Hence the “wombat” nickname. So, yes, it’s a windscreen…
dammit i should have deduced that.
Not to mention I’ll be back in Oz in a month, so I need to get back in practice. Else people will look at me and go “what are you, American?” 
Couple questions:
You’re using the motor to suck air through the test section as opposed to blowing it through, right?
What’s the motor/power source?
What range of test section q are you getting?
How did you design the converging section?
What are the converging and diverging sections made out of?
The U-manometer is a nice touch for sure. At higher AOA (or really just higher lift cases), does it still get accurate readings? It’s hard to get a feel for the size of the test section relative to the wing section…
Not bad for a high-schooler!
My brother would have to answer the specific questions, but he doesnt hang out here! I know the motor is at the back and draws the air through. The motor is a RC plane electric motor, hence the RC unit. The rest is past my paygrade!
This is cool.
Brings back memories of my 8th grade science fair project - built a wind tunnel, since I figured a demonstration type project would keep me out of class, since someone had to run it.
is he using something to smoothe the airflow on the way in? pack the cylinder with straws would probably work
Create a laminar flow with a few hundred drinking straws?
Probably for the full size version, when my sister in law can be persuaded to have half the house gutted!
Probably for the full size version, when my sister in law can be persuaded to have half the house gutted!
Just tell her slowtwitch said so. it must be done.
Kevin’s Australian. Hence the “wombat” nickname. So, yes, it’s a windscreen…
Well then throw another shrimp on the barbie:0)
Really cool BTW !
OK, so its a bit too small for a bike and setup to measure lift rather than drag. I just wanted to share what my 16YO nephew built it for a science project. He did the construction and calculations himself, but of course it does help when your dad has a PhD is aerospace engineering… I really like the homemade manometer using windscreen washer concentrate mixed with food dye!
We did something similar to this in my physics class with a vacuum and calculated drag info on different model cars. Best physics lab ever. We played with weather balloons and toy cars.
Not to mention I’ll be back in Oz in a month
officially hate you now!
eta: nice tunnel, mate!