I found the perfect prop for the Corsair. It is a carbon fiber 3 blade Semi-Scale Biela 26” dia x 14” pitch prop. I was a little concerned about the high pitch and if it would slow down enough on landing. However it is not an issue at all. The engine idles very well at just over 1,000 rpm and lands nicely with just a touch of power. The prop weights about 1/2 of a pound more than my 3 blade 25-12 prop and I was able to remove the weight I made that went inside the aluminum prop hub.
The maximum RPM in the air is 6,500 now down from nearly 8,000 with the 25x12 prop. It does take longer to rev up and I would not recommend this prop for an aerobatic plane but for a scale warbird it is just perfect.
