Rcfury

I don't know how the edge holds knife edge flight but the extra is great. If it is anything like the extra you will love it. You are really going to like the Saito 100 it is a much stronger running engine than the OS 91. If I got a smoking deal on the OS I would buy one but if I had to pay full price I would get the saito. I have an OS 91 on my H9 ultra stik 60 and it is good. It dosen't pull like my saito or TT though. Best bang for the buck in a 91 4 stroke engine is the Thunder Tiger. I have 3 of them and they are all strong engines. I have one that has about 350 flights on it and all I have had to do is adjust the valves a couple of times. It pulls as hard as my saito 100 and will turn the same size prop at the same RPM as the saito. You will love your VF plane for IMAC practice. I was starting to do the intermediate sequences with my extra when I lost it. I have not been confident flying any of my other planes through these sequences. I had 250+ flights on my extra and knew it very well. I flew it at least 3 times a week every week for several months. I really used this plane alot and it was my first really good aerobatic plane. I was flying a 4*60 when I got the extra. After one flight I never flew the 4* again. I ended up giving it to my friend for him and his son to fly. I really need to get me another one. I will try the edge next time just because I want to see how different they really are.

Rick