I have the Katana with a MVVS 160 and here are my comments: The cowl color match to the fuselage is pathetic. I was almost tempted to repaint it. That is my only complaint on the construction of the plane. The rest of the construction is very sturdy and light for its size. A constructive suggestion to Creek Hobbies though would be to use built up tail feathers instead of the slabs of wood. This could save some weight and eliminate the tail heavy problem everyone is having.
The finished weight of the plane came in at 12 lbs even with the plane balanced at the rear CG location. This was found to be too far back for my taste and I added a few ounces to the nose. I also didn't use the red wheel pants to save on weight.
Flight performance was borderline with an APC 18x8 at 7300 RPM. I have tried different props at this size and smaller and this one seems to perform the best. I find that you need to get over the 7000 mark for this engine to kick in. This is also with the BCM inverted muffler. Verticals were okay. Loops can be done some what large. Take offs on grass are some what long. It appears to have problems over coming the drag from the grass. Were it seems to have most of the problems is in the speed. To get a prop that provides enough thrust , you sacrifice in speed. The speed envelope is reduced to a very narrow band. Knife edge is only sustainable at full throttle and full rudder( and thats one big rudder). But what is interesting is that the plane doesn't appear to be too heavy. Bringing the throttle down I would have expected a wing to drop when I reached stall speed. This did not happen, the plane just mushed over slowly without any wing tip stall.
I have only 4 flights it so far. I have some ideas about reducing some weight, and maybe trying a prop with more pitch to see what more speed will do.
Thats my two cents worth, take it or leave it.