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Published online by Cambridge University Press: 28 July 2016
The co-ordinate system used is shown in Fig. i.
The axis coincides with the axis of rotation and the plane is chosen parallel to the plane of rotation.
The plane serves as a longitudinal datum plane for the airscrew blade, and is perpendicular to the planes of the cross-sections of the blade. The axis OX is drawn in the direction of the radius from root to tip.
* As no other co-ordinates but those of the centroids are used throughout the remainder of this work the “ barred ” symbols will be abandoned.