I was wondering why not much is being done to develop a lite-weight mag and be done with batteries & Glow on say 20cc & bigger RC engines. I drew up a sketch that popped into my mind and you can "kinda see" what I am posting about. I wish more of the good talent out there would help us all (working together) to develop such a lite weight mag. I think the main rotor could be made from about 1/8 inch plate aluminum attached to a hub or machined from much thicker piece of aluminum. A real lite coil must be found & magnets that could be attached to the rotor. With the pic-up coil facing back-side of rotor a more narrow set-up would be good. The pick-up surface would be flat instead of curved to match new flat surface. Please add any ideas and data to this thread. Here is sketch below! Capt,n