RE: trainer plane lifespan
I have flown RC for over 2 decades, but I always have a trainer... Right nowe it is an Electric Telemaster, and it is a blast to fly! Other planes I had for very long time: a Super cub 1/4 scale over 15 years and a electric foamy, the Wingo, that has to have like more than 8 years... They come handy when you want to teach or show somebody how easy it is to fly:-)