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When a rod with the fishing length of line is moved, which part of the rod start bending first?  From tip side, from butt side or both simultaneously?  (Max Satoh)

    I don't think we could cast rods that actually began bending first in the butt section.  Though  they may feel like the butt begins to bend before the tip, in that case the rod would not be able to support its own weight.  Would it?  (Harry Boyd)

      My impression based on observation has always been that they bend progressively from the tip to the midsection and then into the butt.  (Larry Puckett)

        I should be more strict in cases.

        Let's assume a rod moves translated: If the rod receive force by movement, it's inertia force. Then, entire part of the rod will receive the same acceleration, as a result, entire part of the rod will start bending thought the degree of the bend is different to each part.

        Let's assume the tip top has stronger load while rod stays unmoved: It must start bending at tip top and the load would be passed toward butt side.  This would be more typical if the rod is soft enough.

        Let's assume the rod (steel for instance) is hard enough which does not bend. Probably butt portion would slightly bent, but within the rod each part still receiving  moment force and bend very very slightly.

        How about this?  (Max Satoh)

          Here you are talking about something slightly different than the loading of the line.  You're talking about the mass of the rod accelerating, and the inertia of the rod tending to keep it at rest.  You'll notice that even without the mass of the line attached.  You will notice it more with the line attached, since the mass of the line is then added to the mass of the rod, and as you accelerate the rod, you accelerate the line, increasing the inertial moment.  Acceleration does interesting things to a body at rest.  (Mark Wendt)

    Since energy, like water, flows in the path of least resistance, I would think that it starts at the tip, until the tip is parallel to the energy path, then as the energy increases, and more resistance is met by the taper, the rod bends further down the shaft.  (Mark Wendt)

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