Small VAWT design

I made a series of videos on designing a small lift VAWT. It needs some editing, but it might be helpful.
This first one is just an introduction:

 

The second video talks about choosing dimensions for the turbine:

 

This discusses the tip speed ratio TSR:

 

A bit about the Betz Limit:

 

This one covers the angle of attack on the blades:

 

This is how I chose my airfoil:

 

This is a little more technical talking about the Multiple Stream Tube model:

 

And finally, selecting the blade chord: