Quote Originally Posted by H2oSki2Fast View Post
Prop don't gain or lose pitch (unless the ears are completely removed from the hub and welded back on.. They are measured in the center of the blade. Adding or removing cup can add or reduce slip, which in turns allows for the variation in RPM.

If the slip numbers don't jive, make sure the tach is reading correctly. Take GPS speed reading at every 500 RPM increments, also recording trim settings any anything else that may affect the readings. It really is the only way to truly figure out what the prop is doing. Take that info to the prop gurus and let them work their magic.
you can change pitch without removing the blade..