O.S. NSU Wankel Rotary Engine Powered Vintage Flying Wing. Assembly and Flight by NightFlyyer.

SEE Specs, History, Price and Links below. The Rotary Wankel Engine's outstanding performance helped me decide what engine to put in Donovan's Combat Clipper. This is the old fashioned way of making airplanes, so enjoy the build, the engine run, and the Flight.
Back in the 60's John Donovan began manufacturing and selling the Combat Clipper flying wing. It was mostly used for combat flying. Well I got one last year and decided to build it with the Graupner NSU Wankel. When I lived in Southern California, I had the Wankel on my Red Pylon Racer with V tail. So when it came time to build this Clipper, I decided that this was the engine to put on it. It is a real screamer, uses lots of fuel, but is almost vibration free. Here are some more facts on the Wankel.
The Wankel engine is a type of internal combustion engine using a rotary design to convert pressure into a rotating motion instead of using reciprocating pistons.
It's four-stroke cycle takes place in a space between the inside of an oval-like epitrochoid-shaped housing and a rotor that is similar in shape to a Reuleaux triangle but with sides that are somewhat flatter. This design delivers smooth high-rpm power from a compact size. It is the only internal combustion engine invented in the twentieth century to go into production.[1] Since its introduction the engine has been commonly considered rotary engine, though this name is also applied to several completely different designs.
The engine was invented by German engineer Felix Wankel. He received his first patent for the engine in 1929, began development in the early 1950s at NSU Motorenwerke AG (NSU), and completed a working prototype in 1957 NSU then licensed the concept to companies around the world, which have continued to improve the design.
Thanks to their compact design, Wankel rotary engines have been installed in a variety of vehicles and devices such as automobiles (including racing cars), along with aircraft, go-karts, personal water craft, chain saws, and auxiliary power units. The most extensive automotive use of the Wankel engine has been by the Japanese company Mazda.
Felix Heinrich Wankel (August 13, 1902, Lahr, Baden -- October 9, 1988) was a German mechanical engineer and inventor after whom the Wankel engine was named. He is the only twentieth century engineer to have designed an internal combustion engine which went into production
On license with NSU /Wankel, O.S. Engines manufactures the 49-PI (Newer Version) to extremely close tolerances.
They are excellent quality and at $699 list, (Tower sells them for $450), they surely should be. Mine was much less, back in the day....
Compact, quiet and almost vibration-free!
The Newer 49-PI is ideal for boosting power in small-scale planes, reducing weight in mid-size craft and for dependable, user-friendly service in any application.
· Two needle bearings, a ball bearing and rotary design's inherent smoothness make it a very quiet and virtually vibration-free option in power.
· Venturi offers more power by increasing airflow into the carburetor.
· Muffler can be angled in different directions for increased mounting versatility.
Mine can't!
SPECIFICATIONS:
Stock Number: OSMG1401
Displacement: 0.30 cu in (4.97 cc)
Practical rpm: 2,500-18,000 to 20,000
Output: 1.27 hp @ 17,000 rpm
Weight: 11.8 oz (335 g)
Includes: glow plug, muffler
Recommended props: 9x6, 9x7, 10x4, 10x5, 10x6, 11x4, 11x5
Thanks so kindly for watching.
Please take a moment to subscribe and also to rate this video.
Best Regards,
Dave Herbert
Academy of Model Aeronautics # 8221
Contest Director, Leader Member, Scientific division.