SIG BERKELEY MINI-ZILCH, 508mm WS .020-.051Authentic plans with Grade "A" materials and modern hardware The "Mini-Zilch" is a precision airplane. This ship has been flown many times; inverted flight, inside and outside loops, figure eights, etc., which are easily accomplished with this amazing little model. Specifications: Wingspan 20 in. Wing Area 95 sq. in. Length 13 in. Engines .020 - .051 in.3 2-stroke (diesel or glow) "Mini-Zilch" goes together fast and gives you the satisfaction of doing it yourself. Berkeley's Mini-Zilch Model Airplane Fit Features: Laser-Cut Balsa and Plywood Parts Full Size Detailed Plans Clear Plastic For Window Covering Material Wheels