I've started making my rotor plates for my delta hubs. I was going to use 1/4" aircraft ply, even bought some (Midwest), but it doesn't seem to be of the quality I remember, this made me nervous. I decided to go with 1/8" 6061 T6 aluminum to put my fear of eating a rotor to rest.
I had decided that I was going to use 3 blades per rotor, just because I'm lazy, that's 6 blades rather than 8 so I still get to make a lot of blades. I thought the triangle plate would be harder to cut that the square one of a four blader, but using my miter saw the triangle plates where easy to make.
http://www.netlabs.net/hp/soarrich/rotorplates.JPG
Now I have to make the blade holders....
To be continued.