Wilesco 01617 Dynamo, Used on D18 , M66 &M66/2 &D409. Can be used on lots of applications. The Wilesco M66 Dynamo is a high-quality drive model that has been developed for use with a Wilesco steam engine. It converts the kinetic energy generated by the steam engine into electrical energy, reaching voltages of 3-4 volts. The Wilesco steam engine utilizes heat energy to convert it into mechanical energy, and by connecting the Dynamo, the mechanical energy is then converted into electrical energy. This Dynamo is ideal for lighting self-developed steam workshops.