Hi everyone, As part of a project, I need to rotate a horizontal solid aluminium cylinder of approximately 15kg mass, 15cm radius and 8cm height such that its surface speed is a constant 160km/h. I need a D.C motor capable of achieving this. The acceleration of the wheel does not matter much - around 1-2m/s^2 is okay. I know I need to convert the speed into RPM, and that I've done: approximately 3000RPM, but what reading should I look for to know whether the DC Motor will be able to supply this output of 3000RPM? I don't think it is as simple as getting one that reads 3000RPM, because there is the torque rating, the voltage, the current, etc. If possible, I want to use around 90V because it will reduce power losses in the motor. But what's the link between HP and speed of a motor? It's quite confusing. As you are aware by now, I'm quite a beginner at mechanics. Kindly give me some guidelines or suggested specifications, or tell me if I need some more starting information. I just need to know how I can select a motor suitable to drive this cylinder around at 3000RPM. Any help would be greatly appreciated.