Performance and Vibration Analyses of Lift-Offset Helicopters

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/ijae/volume-2017/1865751/figures/1865751.fig.003a.svgz" name="1865751.fig.003a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Cross-over angle of 0°</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/ijae/volume-2017/1865751/figures/1865751.fig.003b.svgz" name="1865751.fig.003b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Cross-over angle of 90°</td></tr></table>

<div>Definition of cross-over angle of coaxial rotor (azimuth angle is based on the rotor rotating counter-clockwise direction).</div>

International Journal of Aerospace Engineering

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Figure 3

Figure 3: Performance and Vibration Analyses of Lift-Offset Helicopters 