THE problem of undercarriage retraction has now been completely solved, and difficulties may occur only when the wheel has to be stowed flat under the wing as the motion generally requires a rotation about the centre line of the shock absorber.
Perriches, A.A. (1942), "Retractable Undercarriages: A Simple Method of Solving Geometrical Problems", Aircraft Engineering and Aerospace Technology, Vol. 14 No. 10, pp. 281-284. https://doi.org/10.1108/eb030948Download as .RIS
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