OPJOSE, I have a question please. I'm up in Alaska, my dad's in TN and doesn't have a PC, so I'm asking this for him. He's got a Bobcat Jet 50 (like you've been discussing), and it won't lift. Here's the scoop: He's got a K&B 61 engine, and has tried 11x8, 12x6, and 13x6 props. He's got a big wheel up front (fixed gear) to have a positive incidence relative to the ground. The CG is correct based on your advice to the other gentleman's posting. He's got a 560 foot runway and when attempting to take off (yes- into the wind) it doesn't lift. It does make a really nice nitro r/c car. My dad's been building planes of one sort or another for over 50 years so he's hasn't made some novice error (like I make : ). Thank you, Gary [email protected]