don't forget that weather conditions can change from minute to minute and so represent a factor, other than paddler fatigue and motivation, that will affect the accuracy and reproduce-ability of any measurement.
Nevertheless I am very sympathetic to the idea that deploying a skeg in a cross wind makes it easier for a paddler to paddle a further distance in a limited time period (i.e., increase his/her average speed) since fewer corrective strokes and leans are required.
Cartop Kayak Carriers
Pull-Up Strap Handle Kit
Recreational Kayak Paddle
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