This joint lecture by Airbus and Boeing will look at stall requirements, predictive validation and flight testing. The speakers will highlight where their respective approaches share common ground as well as exploring the areas in which they differ on technical approach.
The various ways of designing modern jet transports for the stall regime will be discussed. There are aerodynamic approaches, flight deck indications, and augmentation control laws to deal with the high AOA arena. The goal of augmented control laws for high AOA is common – no full aerodynamic stall or loss of climb performance should occur in the Operational Flight Envelope, in Normal flight control modes.
The validation techniques employed by both companies in preparation for a flight test campaign will follow. These include flight characteristic predictions based on wind tunnel data as well as pilot-in-the-loop simulation rehearsals. We will also briefly discuss simulation fidelity and the accuracy of stall and stall recovery characteristics. The potential for unexpected stall characteristics in the simulator will be broached (lack of buffet, non-linear roll-off, pitch rate effects).
The speakers will then review various flight testing that has been conducted. Flight test videos as well as animations will be utilized along with time-history data. Flight test peculiarities such as the highly trained nature of company test pilots and the fact that test airplanes are highly instrumented (including tail loads monitoring) will be addressed.
The presentation will close with a brief foray into what the future of transport stalls.
All RAeS Lectures are free to attend and we welcome both Members and Non Members.
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Paul Bolds-Moorehead, Boeing Commercial Airplanes Senior Lead Engineer for Stability & Control
Van Chaney, Boeing 777 Deputy Chief Test Pilot
Terry Lutz, Airbus Experimental Test Pilot
Stephane Vaux, Airbus Flight Test Engineer – Handling Qualities