Sands of Luce: kite buggies and components of force

We enjoyed watching the kite buggy racing on the beach at Sands of Luce. In the picture the wind is coming towards me bu the buggies are moving left and right. The kites are rigged to be pushed at an angle to the buggy's direction of motion that is less than 90 degrees. This means that you can resolve the tension in the strings to one component along the direction of motion that makes the buggy moves forward and one force perpendicular to the motion that will try to pull the buggy over. Inspection through binoculars suggests that the kite is not the same on both edges and is wing-like. Pulling on the strings means it catches the wind differently to enable the pull from left to right or from right to left. It seemed very skillful with the drivers concentrating more on the kites than the direction in which they were going!