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<p>The Joint Army/Navy Rotorcraft Analysis and Design (JANRAD) computer program was developed to aid in the analysis of helicopter rotor performance, stability and control, and rotor dynamics. JANRAD is an interactive, user friendly program, capable of accurately and quickly solving helicopter design problems at the preliminary design level. The program was written as a collection of MATLAB script and function files (M-files) using the 386-MATLAB version 3.5 programming language. The M-file janrad. in invokes the user interface routines and calls various analysis modules (M-files) which contain the appropriate analysis and output routines. Each of these modules use a common routine, trim.m, which employs blade element theory and a harmonic balance method for rotor trim. The program is limited to conditions of steady flight with no winds and is accurate at a hover and for forward airspeeds greater than or equal to 50 knots.
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<br>Subjects: Helicopter; Preliminary design; Rotor trim; Harmonic balancing; Blade element theory</div>
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Nicholson, Robert Kirk, Jr.</div>
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