[jdkskyking]

Nice work! In looking at the original pitch, my seat of the pants engineering would think that was way too conservative of a pitch. Especially for a side load cooling system. Proud of you for tackling this. Definitely not a job for the faint of heart. Let us know how it performs and of course sounds. I imagine you would hear more air movement. On a side note, my only concern would be the age of the plastic fan blades and them now handling a slightly larger load. Not sure what new blades cost or of the company thinks they are good for life.


New blades are $36 each. Yes I plan to replace them.
My VICKERS V20 pump is limited to 37 HP so pitch change makes a significant difference. Wing-Fan rep suggested 35°, he felt the same. His comment was nobody with a side radiator uses 20°. 
I’m going to re-pitch to a lesser degree, probably 25° until I can figure out more about what the higher pitch does to system load. As long as the fan speed is not in the high mode (high=fan rpm equals engine rpm), I think 25° or 27.5° will improve my situation. 
JK