The speed at which a slung load can be carried under an aircraft is often limited by the onset of divergent oscillations. Simulations using highly-resolved airloads maps are described, in an effort to determine divergence speed. Airloads are obtained using the Continuous Rotation technique, which converts the discrete-attitude static airload measurements problem to a periodic problem amenable to closed-form analytical description. Free-swing tests of scaled models are performed in a wind tunnel with and without initial perturbations, to capture quantitative and qualitative records from encoders and from video, also capturing the likely modes that amplify. Results are presented for a cuboid and a porous box, the latter with and without one side closed. The roll divergence mechanism, the coupling of roll and yaw frequency, seen in swing tests is clearly observed in simulations run on the cuboid, both when yaw is forced and when the model is free.
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