My experiance converting to CS Prop
I did convert my RV6 from a Sensenich fixed pitch to a Hartzel CS compact hub prop after about 200 hrs flight time. Issue 1...does your Operations Letter permit it without getting a new Ops Letter from the FAA. It amounts to recertification & new Phase 1. My letter, which is from over 10 years ago, allowed me to modify without FAA or DAR assistance which some later letters will not permit. Issue 2...does your engine support the change such as hollow crank, Crankcase oil source, and governor pad on Accessory case or crankcase. My 0-320 had all this but the model number said it would not so one has to look.
What did I gain? Better takeoff performance since I can turn 2700 RPM on take off verses only 2200 RPM with the FP. Cruise? I feel, and I did not track the data well, that I lost some cruise speed slightly but gained rate of climb and better short runway performance. Landing? Airspeed control was not as critical with the CS verses the FP. With the FP airspeed had to be right on but CS allowed a wider tolerance and still land the plane which happens to be a taildragger. On landings the FP required me to start slowing about 3 miles from the airport to reach flap speed while the CS still requires some planning it is nowheres as critical.
Would I do it again? No question...YES!!! Is it needed, no, but it is very nice. I would rather go to a VFR steam gauge panel to save the $$$ for a CS prop if needed, BUT I would not fault anyone for going FP. The airplane changed from a small well balanced machine which handled very well to a more heavy airplane which smooths out any mistakes a ham fisted pilot can come up with (that would be ME!). The heavier prop added 15 pounds net to the weight and added some sort of gyroscopic qualities which adds considerable stability on the runway so it is a tradeoff. It makes you look like a better pilot than you really are...that's me again!! BTW, after I flew with this prop, I relocated to the New Mexico where there are mountains and high density altitudes and now I really like this prop!!!
I hope this helps with your decision.
Dick DeCramer
RV6 N500DD
RV8 Finish kit...CS prop planned
Las Cruces, New Mexico