I just wanted to say I had been asking people about harrier and the ucd 60. I finally got it. I put a 17x4W apc prop on my ucd 60 with ys 1.10 (5.5 cg) and it flew like a different plane!!! I had been flying 16x4W and 16x6. My least favorite was the 16x6 as it just seemed to be wiggly in 3d. The 16x4 seemed to be under proped and I was getting 10,500 rpms with it. I did not tack the 17x4W, but, it was amazing in flight. The hover would set in and I could just hold it forever. I got into a harrier having nevered harriered before (used full spoileron mix tied to elevator) and I was able to just drive it around with my rudder like a car. Could go higher, lower, staight.. ANYTHING. LIke a dream. Went up one end of the runway and turned around and came back down the other in harrier the full time. I am not saying I am a great flyer b/c.. I am not.. it was really like driving a car.. EASY!!

I biffed the landing and ate the prop... Very next flight I put the 16x6 on it and could barely hang it!! What is up with that!! I was in the process of doing an elavator wiggling around with the 16x6 and my engine died and I biffed the whole front of the plane.. could not get it out of the stall fast enough.

Has anyone else had this much of a radical change in 3d characteristics with the change of a prop? I am not posting this in regards to what cumn thru says with his combo. I was going to post and just read that. He seems to be very experienced and I really am not. I'm sure his combo works great. Makes me wonder though if you have tried the 17x4W cumn thru and what you thought of it (if you like the 16x6 better). and I would be curious if anyone else has tried this too (17x4w).. AMAZING.