Well, Im back home from fiddling on the KR. Ive been trying a different prop from a guy in Dallas who was nice enough to mail it to me to try. Mine is a Prince P-tip 52x50 that has been thinned on the tips some. The borrowed prop is a standard Prince p-tip 52x54 that has not been thinned. I can turn my prop 3350 static and around 3900-4000 full power - speed around 180. The borrowed prop turns 3000 static and 3400 full power - 175 top speed. It seems that both had decent climb and cruise but one thin I noticed is that mine runs smooth as silk compared to the other. I know that mine is lighter by almost a pound and perhaps the higher rpm and thinner blade cause it to run smoother. I did a lot of test flying and fiddling with the two props/carb adjustments/ ram air sand so on. The best running configuration I have found is that which I have presently. My prop with the air being picked up in the cowl. The ram air tends to make the engine run rougher at top rpms due to running leaner, but if you richen it up the low end gets two rich. Perhaps I will customize my needle somewhat. I just installed a secone EGT probe on the left back to be able to make better and finer adjustments down the road. It may be that ram air has a negative affect on the aerocarb. Talking to WW he said there used to be an old trick of putting on a little carb heat at full throttle in radial engines. This would balance out the fuel mixtures to each cylinder better and help atomize the fuel. Since I am currently getting cowl air it may be slightly warm and help. Still have more testing to do but had to get it flyable to the College this next weekend. Hope all is well - Bill
