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<p>The results of a two-propeller tilt wing aircraft static stability and performance  simulation utilizing a NASA-Ames computer code, Tilt Wing Application General  (TWANG), are presented with comparisons to actual test flight data. The Canadair CL-84  tilt wing aircraft was used as a model for the geometric data utilized by the computer  simulation. Aerodynamic data for the simulation were obtained from previous NASA  Ames research related to a four-propeller model. Variables used included a wide range  of parameters associated with flight conditions from hovering flight to maximum cruise  speeds at several different altitudes and wing tilt configurations. Longitudinal pitch  stability was the driving factor in determining aircraft static stability for the various flight  conditions. Results of the simulation indicate that the TWANG computer code provides  an accurate prediction of both generic and specific tilt wing aircraft static pitch  performance characteristics, as well as the additional capability of providing the required  mathematical parameters for incorporation into the NASA Ames Vertical Motion Simulator as software inputs.
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<br>Subjects: Tilt wing VSTOL aircraft; TWANG; TLTWNG!!; Longitudinal pitch attitude; Longitudinal stick position; Elevator position</div>
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Neiusma, William J., Jr.</div>
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