I have just done the air-test on my new prop and it “does what it says on the tin” !
T/O and climb performance are still as good as before, I expect the thinner blades are more efficient….but improvement in the cruise is very good. For the same cruise rpm as before I’m getting 8 or 9kts increase (13%) or if I cruise at my previous 60kt( good for nav calculations) rpm is 150 to 200 less. I am running cooler on CHT and Oil temp as a result. I am very pleased with the results.
It also looks every bit 1917 / 18.