The dimples is just one way to produce the turbulation. It's maybe better and maybe not. That's the point. Dimples on their own are not something magical. As I said, the dimples are just the way the golf ball makers do it as the dimples are not so easily damaged by hitting them with a big lump of metal on the end of a stick. Various models have successfully used thread and tape turbulators for years. And full sized stuff often can be seen to use "invigorators" made from little tabs of metal sticking up from the wings. Look at the wingtips of A4 Shyhawks for such an example.

A drill motor won't tell you what you need to know and they don't turn fast enough in any event. You need to run somehting like a geared electric model motor and monitor the watts inputed into the motor and vary the voltage, and thus the current as well, to achieve a constant RPM. By keeping the RPM constant and monitoring the voltage and current you're working with less variables and that makes your calculations easier and more meaningful. In any research like this you want to ensure you can keep as many things constant as possible. And to do this with your project that means either inputing a constant power and measure the RPM or running at a constant RPM and measure the power used.