This will have nothing to do with the original question, but I could no longer ignore a couple of the above posts. I've been a modeler since early childhood, over 50 years, and have built lots of models. Flew my first R/C in 1960. Over the years, I've found that rubber power free flight to be the most challenging aspect of model aviation. I think almost anyone can buy an arf or rtf trainer and learn to fly it in a weekend or two, but if you will ever watch a competitive rubber F/F clawing for altitude then transition into a long, flat glide, you might get hooked. Jim