Sig ,Makes Some free flight with, Rubber Motor, Kits. With those kits you have the option, to put a small, Glow engine on it.You can do that with Guillows kits too,but ,I`ve never had good luck flying with them,Wrecked them all.Very nice displays though.The Sig kits Are great flyers though.Just another option..I can personaly tell you, that, the Cabinaire, and Tiger, that I gave my young nephews, were a big HIT ,with them. http://www.sigmfg.com go in there Click" Airplanes"then click "FF BIY Airplane Kits" you`ll find them.Just bellow those menus ,Check ,out ,the Herr Enginering, FF BIY Kits too.Haven`t built them, but have heard ,good things ..