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Yes, and, you'll notice, the harder you press the rudder (i.e. the higher the rudder angle), the more the ski slows down (the rudder becomes more of a "plow"). So, in essence, you are exacerbating the problem by trying to turn.
Then, once the ski is going slower than the wave, the wave pushes your stern around and you broach.
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MCImes wrote: One thing Don mentioned is that many rudders have a sharp leading edge, which is detrimental to turning. This is because although a knife edge is hydrodynamic when it is parallel to flow, as soon as the flow becomes non-parallel (like when you turn the rudder at all), it causes unstable vortexes on the trailing side of the rudder (also called Stalling i believe). When the rudder stalls, its turning potential drastically drops.
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