I have been talking to Master Airscrew / Windsor propellor and the are going to make some more 3 blades. I did start a survey on the SS website as I don't think I had signed up here yet. I took the printouts over to them and am hoping the will come out with 10x5, 10x4, and 11x5,and 11x4. Will let you know if anything comes of it. If Jeff sells enough , maybe he will produce more. His price range of $8.00 > $10.00 for these sizes would allow more flyers to experiment.
Bruce