Aircraft Maintenance Technology

APR 2017

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GENER AL AVIATION 20 APRIL 2017 AIRCRAFT MAINTENANCE TECHNOLOGY tors for a much longer durability. Geiger engines are cooled at the engine perimeter with water. This was not really an issue on other liquid cooled-Wankel engines; the problem was a cooling of the rotating pis- ton which is enclosed in the hot engine. The rotor was in the past often insufficiently cooled by air as a coolant and lubricated with the addition of oil drops. In this point Geiger engines are differ- ent. Geiger uses two oil circuits and two oil pumps. On a pressure side there is a constant oil flow (over 2 gal./min.) in liquid form (not evaporated oil drops) to cool and lubricate the rotor internally. This oil circuit has a dedicated feeding oil-pump and an oil cooler. The warm oil is transported by a scavenging pump to the oil tank which is located just aft the engine, inside the space cage cre- ated by the engine (adapter) mount. This all-aluminum structure is bringing the Geiger engine in a much more forward location because it is 20 to 40 pounds lighter than other four-stroke engines. This engine adapter is being designed to fit the Rotax 912 engine mount. All engine moving parts (approximately 70 percent less than in conventional piston engines) together with the central drive shaft use ball bearings for easier maintenance. The rotor seals have been improved with new materials and coatings. According to Geiger the TBO should be at least 1,000 hours and will further rise. FUEL/OIL CONSUMPTION In the past the fuel and oil consump- tion of Wankel cycle engines was pretty high; today this has dropped with a use of electronic fuel injection to "normal" levels, according to Geiger. The 100-hp engine burns 4 to 5.3 gallons (15 - 20 GEIGER TWIN 2 A2 74 engine. REGISTER TODAY www.ebace.aero Join European business leaders, government officials, manufacturers, flight department personnel and all those involved in business aviation for the European Business Aviation Convention & Exhibition (EBACE2017). Visit the website to learn more and register today.

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