Plans for building wind turbines from brakedrums are now available in 2 flavours:
UK and "North American"
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The UK version is available from me and also from Picoturbine in the USA
It includes information suitable for North american readers.  This page is to clarify the differences and similarities
The "N American" version is taught by Robert Budd at workshops in Ontario.
and is based on the UK plans, modified for a larger brakedrum.
Here are some basic dimensions for the two versions.
There are diagrams below to help you identify what the dimensions mean.
UK version N. American
       
Vehicle
Transit van
Ford 3/4 ton truck
  
 
(long wheelbase)
E or F 250 or 350
  
Internal diameter
254mm [10"]
306mm [12"]
  
number of magnets
20
16
  
Magnet length
64mm [2.5"]
76mm [3"]
  
width
32mm [1.25"]
51mm [2"]
  
thickness
20mm [3/4"]
25mm [1"]
  
Air gap diameter
212mm [8 5/16"]
251mm [9 7/8"]
  
lamination diameter 
204mm [8"]
245mm [9 5/8"]
  
thickness
64mm [2.5"]
76mm [3""]
  
       
Coil former leg length
76mm [3"]
76mm [3"]
  
overall length
96mm [3.75"]
90mm [3.5"]
  
width
22mm [7/8"]
33mm [1 9/32"]
  
thickness
2.5mm [3/32"]
2.5mm [3/32"]
  
no. coils/ phase & total
10 & 30
8 & 24
  
Wire size
0.8mm diameter
0.7mm diameter
  
 
20awg
21
  
wire turns per coil
24
36
  
nominal voltage delta
12V
12V
  
star
24V
36V
  
 
      

There are also two different designs for the blades.  The "N American" blades are larger.
 

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