wi can be found using the Biot-savart law, as the velocity induced at each point on

the lifting line by the entire vortex system.

There are 3 components:

1. Velocity induced by the starting vortex. Neglect, because the starting vortex is so far away.

2. Velocity induced by the bound circulation. Zero: the bound vortex induces no velocity along its own axis.

3. Velocity induced by the tip vortices + vortex sheet. In practice, we bundle these together, because

and consider the tip vortex to be just a strong segment of the vortex sheet.

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