It is very common for people to try different props on KRs to get better performance. If you do change your prop you need to be aware that a different prop constitutes a major change as defined by FAR 21.93. When you perform a major change you wind up back in the test phase if you have already flown your hours off. What your operating limitations say about major changes depends on how old your operating limitations are. Typically it requires that you notify the FAA of the major change and have them approve your test flying area for 5 hours before you fly the plane again. This is just like before with day VFR only with no passengers over sparsely populated areas, etc. with the logbook entry on completion of the successfull test flying. I assume that if you are still in your initial test flying phase that you don't need to notify them, but I am not 100% sure.
I would be the last one to tell anyone what they should do, but I wanted to bring this up because most people are not aware of this. Someone made me aware of this after they got in trouble for it. There are enough things that will bite us out there without stumbling into a rule violation that we are not even aware of. Know what your operating limitations say and know what each limitation means. From there you can do what you want. Brian Kraut Engineering Alternatives, Inc. www.engalt.com
