The Sky Demon is truly a stick and tissue modelers model. The original Sky Demon designed by Tim Bucher was published in the “stick and tissue modelers album” as a micro electric Free Flight model.  The BMJR Sky Demon deviates only slightly from the original to accommodate E-20 components and to comply with the E-20 rules.  Wing area is 69 sq. In. and flying weight of our model is 29 grams, covered with Japanese tissue with nitrate dope.