My first curling hack was to attach a speedometer to a tiny RC monster truck wheel and mount both on the end of the broom. When playing as a sweeper, I would s

My first curling hack was to attach a speedometer to a tiny RC monster truck wheel and mount both on the end of the broom. When playing as a sweeper, I would slide along and touch the wheel to the ice as the thrower released the rock to get an accurate speed reading of the rock. Especially during draw weight shots where you're trying to hit the button, this aided the call as to whether to sweep or not. The idea may have been good, but the nuances of curling and the fact the ice is constantly changing speed throughout the game made the data not very useful. In the end, a well trained 'eye' was just as accurate and much quicker to make the call.