my sugestion is to seek out the local RC field and ask the questions of the fellows there and explain your purpose. we are builders of model aircraft and we are knowledgable about your questions. IT AIN"T a school yard project-- it costs money $$ and can be dangerous to spectators. we have to be resonsable to ourselves and to spectators. its not a school yard project. PERIOD. we will help you build but not fly in a school yard with student spectators. did I repeat myself enough to get the point across? dick