Allows for rapid ramp up and deceleration. As such, many makers of homemade mead recommend either shaking a pitcher with a gallon or simply buying one of those stirring paddles. The paddle is designed to be inserted into a drill and then used to stir the wort with mechanical power. Several considerations. 1) Paddles are difficult to use in gallon bottles. You need to find the right angle and push a little. 2) The two blades only rotate and work when you run the drill at full speed. Make sure you are using a high torque drill with a fully charged battery. 3) The racquet is a bit difficult to clean and disinfect. a little quirk. Is that better than shaking the hell out of 1 gallon bottles? Of course. Difficult to clean and difficult to use? Yes. Take this into account when purchasing.