angle of blades

[Kansas Rust Buzzard]

Since nobody else has posted here yet, I shall begin..... I am wanting to get my 18ft RR Eclipse going pretty soon, I have most of the dimensions I need however, I am really going to pump water with this mill and wanted any of you experts to give an opinion of the angle for the slots of the blades for the most efficient pumping. I have 14 MPH wind average here and its going to be in the open, I am just trying to figure out what the sweet spot is for degree. Thanks

[MAS (RIP)]

Not sure if a 10' would be the same but I cut mine on my Bridgeport mill and I set the head at 35 deg. I got the angle from some original parts.

[Kansas Rust Buzzard]

Thanks, I don't think its the same just because I read on the larger, 20ft and bigger, they changed the degree for the outer set of sections from the inner. I am just assuming they hit a happy medium on the 18 as the blades are pretty long. I have rebuilt a lot of L Monitors and I have seen two different degrees for 12 blade and the 13 blade section was 37 degrees, not sure if they were made at different times or just remade and not right?
Thanks

[windmillerman]

Ralph Weibush should know