What engine are you putting in your Tucano? My son and I both have PC9's and it took us a while to get the engine right. We started with Magnum 52FS which went ok, then tried Thunder Tiger 54 FS which are a good motor but mine didn't like being inverted. They both died after a couple offlights and ended up with Saito 72 FS motors which are brilliant. We didn't have any problems with the tank position with any of the engines but ours are Seagull models. Just make sure you fit a remote glo to the engine. They only cost $10 and save a lot of messing around with glo drivers. The plane looks very good, if I didn't have the PC9 I would consider one of them