Ed Anderson wrote:

Ok, Perry

    I found a diagram with how pitch is measured.  It looks like its
measured from a surface parallel to the face of the propeller to the chord
of the blade at each station point.  I will take those measurements at 3"
stations out from the hub center line.

Ed Anderson
Matthews, NC
RV-6A N494BW
eanderson@carolina.rr.com

Come to think of it Ed. Just moving the stick back and fourth
while the tail is tied to a tree with the long rope and full
engine RPM will bob the nose up and down.

Paul Lamar

Ed, it doesn't matter if you measure the angle relative to the thrustline or relative to the
plane of the blades, I just need to know which.  One is 90-(the other).  The prop program I
use actually simulates the prop at each station and sums up the total effect. Pitch isn't
necessarily the same at station 10 as it is at station 15 for example.  The program wants
blade angle at each station in degrees through the chord line of the blade, not the flat back
side or some other reference.
Once I get that data I can simulate your prop and we will see if the results match your
experience.  Then I can simulate LAEV at various pitch settings for comparison.

Perry

 
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