A modified thrust reverser that reduces noise and augments thrust on Pratt & Whitney JT8D-200 series engines is now being offered to Boeing MD-80 operators by Las Vegas-based Dugan Kinetics.
"A new stow position has been developed for the thrust reverser, where it has the new useful purpose during flight of adding thrust with no additional weight or fuel consumption. This position uses the reverser doors as an ejector during flight," explains Dugan Kinetics marketing director Jack Dugan.
The so-called EP-80 Ejector/TR surrounds the engine exhaust nozzle to suck the ambient air flow into its chamber causing this accelerated flow to mix with the engine's higher velocity exhaust flow. This mixing also reduces noise. Additional noise reduction is realized by reducing the engine pressure ratio (EPR) to the desired thrust levels for takeoff, climb and approach, according to the firm.
Dugan says the EP-80 Ejector/TR has been tested on the MD-80. Some testing has also been done with a Boeing 727.
"All tests have provided a total flight fuel savings range between 6%-12%. The 727 tests were done in 2007 and the MD-80 tests in 2008," he adds.
The company has not as yet released customer-related details.