Search Results

The feasibility of a unique semi-tailless aircraft configuration that utilizes a split empennage, mounted outboard and aft of the main wing trailing edge (“scissor-tail”) is examined. A description of the combined analytical/empirical model of the tip vortex flow field as a function of the geometry to evaluate the effectiveness of this type of empennage is included. An evaluation of the performance and stability and control of the “scissor-tail” is performed to determine the applicability of the configuration to a general-aviation aircraft. Results show good agreement between the analytic/empirical model and available performance data. Results also indicate that the configuration is controllable, stable and a good candidate for a general-aviation aircraft.

Recently, a significant level of interest has been expressed in the development and application of ducted fan propulsion systems, similar to those used in radio controlled scale model jets1,2, for experimental replica jet aircraft3,4 and possibly for certified aircraft. The authors have developed a preliminary design tool from methodology5 previously developed and calibrated for the McDonnell-Douglas NOTAR™ helicopter pneumatic anti-torque system. The design tool, PDF (Preliminary Design Ducted Fan), is an aero/thermodynamic analysis program which simulates the internal flow of the fan/duct systems in a systematic component build-up approach.