they are just taken off 3-view scale drawings and scaled to 22" WS in an autocad program....we're heavy into the AMA 2610 scale and Open-B combat classes here....just thought this would be fun.....this is actually our gear from our "Micro Sumos" that we fly indoors....but these are alot faster flying than the Micro Sumo....same prop,motor,servos,esc and batt.......who says you have to grow up????