Back in the day, I made Cox rich by crashing and repairing and finally trashing the lead sleds they sold (five or six, as I recall). I doubt that the law of gravity has been repealed, and suspect that their CL models remain obese...

The Cox planes did allow me to figure out the basics of CL flight, but looking back, lighter woulda been MUCH better. Finally had great success with a Carl Goldberg Jumpin' Bean... quick to build, much lighter, would fly slower and was aerobatic, and my last .049 airplane - FWIW, my next airplane was a Veco .19 Papoose that was terrific... FFWIW, I never had problems with the Cox engines as long as it had good fuel, 2-3 turns open on the needle valve, a healthy glow plug and good battery, but that was then...

Good on ya for getting your kids up and flying [sm=thumbup.gif][sm=thumbup.gif]... Let us know how it goes!!