As has been pointed out, you have not specified if you have a 1.2 two stroke or four stroke. It will be a big difference. If its a Saito 1.20 four stroke then the power to weight ratio is not in your favor. The Saito 1.20 is kind of a dog compaired to the new Saito 1.15 that is about the same size as the Saito .91 but puts out like a 1.20. If you have an OS 1.20 ax then it will be rediculous power for the plane but you would not be the first. I recently read a thread where a 1.20 ax was installed in a Hanger 9 60 size Mustang. That being said the Corsair can be a handfull for the inexperienced. I have been flying for over 3 years now including a 50cc Aerowworks Extra 260. I recently picked up a Top Flight 60 size Corsair with a Super Tiger .90 two stroke in it that I hope to maiden today (the previous owner built it and never flew it). My point here is even with my other experiences I am going to aproaching this maiden flight with extream caution due to the Corsair's reputation. Aditionally every Corsair I have ever seen at the feild (two) has taken off, rolled left and planted.