I suppose that the 'truth' (is there such a thing
) is something in between, a mild flex would be the optimum for the following reasons:
- A too stiff board will not flex and released the accumulated energy as a spring (similar to loading the lines), besides that it tends to ruin your knees on the long range.
- A too soft board will damp the pop and you will be pulled by the kite before the board straightens back, pushing the water for proper timing of the popping reaction.
My feeling is that well designed carbon boards can meet the best compromise.
From all boards I tried, the carbon ones were those that best pitied my legs on all types of water.