I have the arf version and I have an OS 90 in it and it is flying just fine. Here after I get my building table cleared off some I plan on pulling the covering off and recover with ultera coat chrome to copie my Giant Scale P-47. That way I will have two of them a big one and a little one. I also plan on sheeting the wing sos I can put bomb drops on it the mechanical retracts are working just fine except for a rough landing once and a while (have to straighten the gear wires out) also plan on trying to build gear doors for it also. If you guys noticed that the area under the fuel tank is hollow. On mine I took and cut out about 1/2" under where the tank would be to about 1/4' from the outer sheeting of the belly and them used some skinning ply to enclose this area sos the hot air from the engine could be vented out of the cowel down the belly pan to the turbo exhaust. This works quite well for my bird and greatly inproves the looks of here too. So now all I have sticking out the cowel is the muffler. If I had a scanner I would post some pictures of what I did and I think you guys would realy like it. My batteries are located above the fuel tank.