The two hub disks are 12mm marine ply, both sides coated with glass woven mat and epoxy. There is a cut-out in the outer disk to allow access to the mounting nuts.
Holding this in my hands has made me realise a few things which need to change to support these blades in a Cape Town storm:
- The 12mm shaft is too small - I have bought 20mm bar to use instead, with matching bearings
The 42mm pipe I use as a pole is too weak. I have bought some 50mm pipe to replace the 38mm pipe I used before for the mounting bracket
Watch this space!
PS: If a few people want blades of this size and order together, the manufacturer has said they are willing to make a special price.