Why does moving weight Aft Cause Lee Helm

If you attached a keel to a coke bottle and pushed as though you were the wind on the coke bottle amidships, the coke bottle would slide side ways through the water. Now move the keel further back, the front of the coke bottle would turn downwind. When the crew moves aft more of the boat aft is in the water. It is like moving the keel back. Lee helm is when the boat by it self wants to turn down wind. You counter this by moving the tiller to the lee (wheel to weather). Moving CLR aft creates Lee helm. The water is pushing back to windward as the boat slides sideways through the water. The center of effort of this water push effect has moved aft which acts to turn the back of the boat upwind which is same as turning the front of the boat downwind.