I've got an LT-40 Flew very nice with a 40 la the 46 la has more power and runs Great as well. Go with the 46LA to start out with. You will love the Plane and the Engine! I have had the Plane 4 Years now and I do alot with it. I have a bombay door in it and I Pull Banners with it! I also put a Magnum 91 four stroke in it after three years of refreshing my flying skills. Go with the 46 LA or a 70 Four stroke you'll love it!