RE: Nitro Planes Bobcat
I also lost one that was uncontrollable immediately after take off. My mistake was that I forgot a basic rule of balancing. If the fuel tank is in front of the CG, balance with the tank empty. If the fuel tank is behind the CG as on the Bobcat, balance with the tank full. I CG'ed with an empty tank. When I fueled it, I had put about eleven ounces behind the CG making it extremely tail heavy. You know the rule, a nose heavy plane fly's poorly but a tail heavy plane flys only once.
Al Burman