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An experimental study is performed to investigate the possibility of relaxing the octane requirement of a Rotax 914 engine equipped with a pre-chamber jet ignition system. A pre-chamber jet igniter with no auxiliary fuel addition is designed to replace the spark plug in cylinder two of the test engine and is evaluated across engine speeds ranging from 2500 to 5500 RPM. Experiments are performed across both normally aspirated and boosted configurations using regular 87 AKI gasoline fuel. Normally aspirated results at 98 kPa manifold absolute pressure show a 7-10° burn rate improvement with the jet ignition combustion system. Tests to determine the maximum load at optimal combustion phasing (no spark retard) are then conducted by increasing boost pressure up to maximum knock limits.

The paper reviews the current status of flight test, certification and in-service experience with the latest members of the Airbus Industrie commercial aircraft family - the A330, A340 and A321 - as well as efforts under way throughout the Airbus system to improve the efficiency of its manufacturing business performance, including the development of a new, highly productive tool, the Airbus Super Transporter.