O.S. Wankel Type 1-49 NSU Rotary RC Aircraft Engine – Graupner Rare O.S. Wankel Type 1-49 rotary model aircraft engine with original Graupner box. True NSU Wankel rotary design, not a radial engine. • 4.9cc (0.30 cu in) • Glow plug rotary engine • European Graupner version (Best-Nr. 1800) • Very smooth turning • Original speed controller mounted • Includes original box (shows age and wear) This is a hard-to-find collectible engine, ideal for a vintage RC build, rotary enthusiast, or display piece. These are becoming increasingly difficult to find, especially with the box. Sold as is due to age. Please review photos for condition.