Patents Assigned to Pratt & Whitney Aircraft of Canada Ltd.
  • Patent number: 4172572
    Abstract: An exhaust stub for a turbo-prop engine which exits from the aircraft nacelle at a location other than the aft end. A fairing is attached to the exhaust stub to minimize frontal area for a given exhaust stub exit area, but free of the nacelle, because of the requirement for the exhaust stub to move relative to the nacelle. An end plate is secured about the exhaust stub and fairing, substantially parallel to and at close proximity to the nacelle. The end plate effectively improves the performance of the fairing, by eliminating the effect of the gap in the nacelle around the stub and also the gap between the fairing and the nacelle. Improving the performance of the fairing reduces the magnitude of the exhaust duct wake which in turn reduces the momentum definiency in the wake flow; reduces exhaust duct drag; reduces mixing of the exhaust gases into the wake region; and reduces nacelle sooting by exhaust gases.
    Type: Grant
    Filed: June 9, 1978
    Date of Patent: October 30, 1979
    Assignee: Pratt & Whitney Aircraft of Canada Ltd.
    Inventors: Wilson C. Doig, John J. Sanderson