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High Performance Small Aircraft Engines

(1) RX50 is a Single Stage Wankel Rotary type engine producing up to 52 Hp at 10,000 RPM, vibration free, weight approx. 25kgs, made in Germany. If you want a small light weight engine running like a turbine without vibration, yet producing high power, the RX50 rotary engine is for you. See the smooth running power curve of the RX rotary engine as compared with sharp power cycles of a two-cylinder piston engine below: 

Power Curve/Peak Line: RX50 Single Cylinder Rotary Engine (Smooth) vs.  Two Cylinder Piston Engine (Sharp)

　

James, from the USA, is a FAA certified helicopter flight instructor, examine the RX50 core in his hands. 

Finally, there is an engine designed specifically for light helicopters with electronic fuel injection and constant revolutions.  This is the one many have recommended. If you would like to know more about this engine, please e-mail us, or contact Hirth of Germany.

(3) Mz201 and Mz202 are 2-cylinder inline two-cycle engines,  rated at 45 Hp and 60Hp.  The fuel consumption is low due to the double CDI ignition system with variable ignition points.  A single Tillotson diaphragm carburetor is standard. It comes complete with electric starter, exhaust system, wiring harness, air filter and weight about 31 kgs. 

NOTES:

RX-50 (Following FAQs from the engine maker.)

Are there plans for a larger horsepower version? 

Yes, a two stage 80 HP version is in development now. Look for this engine to be available in 2 – 3 years...

Can this engine be mounted on other aircraft ? 

Yes, the Factory will work with you on the modification of the engine mount. Also look for other manufacturers to be offering this engine on their aircraft in the future.

So – what is the market niche of the rotary engines? 

Applications where customers look for a turbine like feel of the engine, a steam engine like torque curve, an engine weight which is lower than the weight of a 2-stroke engine, the ruggedness of a 4 stroke engine and an engine which burns low octane fuel without ringing.

Can this engine be mounted upside down? Look for an answer soon.

What does an overhaul cost? Look for an answer soon.

Does the rotary engines have dual "aircraft style" ignition circuits?  

The 4-stroke rotary engines have single CDI ignition. To modify the engine for "dual ignition" would make the product too expensive. We don't have plans to do so. In the case this dual ignition is a "MUST HAVE" for you please pick any other engine type/brand with dual ignition.

To mix 40:1 oil in fuel mixture is additional work – do you plan to use a wet sump pressure lubricated system in the future? 

No. We will stay with the 40:1 mixture. Like explained – our market niche is "engine weight".  

What are the advantages of present day rotary engines?

(Following excerpt courtesy from an EzyCopter dealer for description of a typical rotary engine.)

There is a rumor circulating in the industry, that Rotax may in the near future stop supplying engines to the ultralight industry. While this is just a rumor, it is good to see that several other ultralight engine manufacturers are either entering the market or improving their engine products.

Over 35 years ago, there was a four stroke engine used in snowmobiles called the Wankel. While the engine had great potential, it also had numerous problems, one of these being "heat". But technology has advanced a great deal in the past 35 years, and it appears with this advance, the problems associated with the Wankel engine had been eliminated.

The Wankel engine was invented in Germany and was originally licensed to Mazda, to produce the Mazda rotary engine. While the Mazda rotary engine, uses the same principles as the Wankel engine, the present day rotary engine is a totally different design.

For those not familiar and with the rotary engine we will try to give you a very simple explanation. The piston engine has a crankshaft connected to pistons that move up and down in cylinders, at the top of each stroke the piston is forced by an explosion back down the cylinder. Since the piston and crankshaft have to stop at the top and bottom of each stroke at great deal of vibration is created.

A Wankel engine has a disk, shaped like a triangle, that rotates in a circle, thus there is no top and bottom of the stroke, which practically eliminates vibration. In fact the demonstration model run had no rubber mounts to dampen the vibration at all. Yet looking at the engine you could see no vibration, and when reached out and touch the engine one would not feel vibration.

The Wankel is a four stroke engine, and it is liquid cooled, the aircraft Wankel engines are unique in that they use both a charged oil lubrication system and charged water cooled system. These two cooling systems, plus the use of nickosil coating have eliminated the heating problem which plagued the early Wankel design.

The Wankel engine comes to the customer with single or dual ignition, fuel injection, exhaust system, electric start, alternator with several cooling systems available depending on aircraft make and model. The reduction drive system is a belt drive available in two ratios a 2 to 1 reduction and a 3 to 1 ratio. The factory recommended TBO is 2000 hours or three years.

When asked how many of the current aircraft Wankel engines have reached 2000 hours the factor representative indicated that the factory aircraft has just over 1600 hours on it, with two other aircraft with over 1000 hours on them. It is also reported that these engines have had no problems to date. Another example the factory representative gave was that there are several go-cart racing teams in Europe using the Wankel engine who have over 400 hours of racing time on them, with the engines having never been taken apart. This compared to the piston engines that they formerly used where they had to be disassembled every 5 to 10 hours.

Well now for the tough question. How much money? After all there are only seven moving parts in Wankel engine! Well you had better sit down. The 35 hp single rotary engine which weighs 79 pounds was quoted at $6300 American! The 75 hp twin rotor Wankel engine which weighs in at 109 pounds was priced at $8850 U.S. dollars.

It was pointed out that while the single rotor engine was quite a bit more expensive than say a 2 stroke Rotax 447, the investment was in a four stroke engine, with a longer life cycle, better fuel economy and better reliability.　 

祐祥直升飛機股份有限公司 / 台中市中部科學園區科園一路5號 

E-Mail: clin@mail.com / ezycopter@yoshine.com  

Tel: (04) 2462-7889  Fax: (04) 2463- 9165

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Last Modified :03.21.2007