Catto Prop Pro and Con
Pros:
1) It is easier to hold the nose off the ground on landing since the front end is lighter (A friend sold the CS prop off his -6A and installed a 3-blade Catto after bending the nose gear on landing.).
2) If you do screw up a landing, there is more ground clearance.
3) My -9A goes a calibrated 6 mph faster than Van's -9A demo (as determined by CAFE) but a higher RPM.
4) I know of two sixes that gained top speed after installing Catto's, one from a CS and the other from a 2-blade wood prop.
5) Pilot/paggengers have remarked than my plane seems smoother and quieter.
Cons:
1) My Catto has several chips after only 180 hours, and I have only landed on paved strips.
2) It is necessary to reduce the RPM in rain.
3) With less weight on the nose, it is easier to get in an aft CG condition.
Leland
RV9A with an unmodified O320D1A