William Robinson writes: Having lot of interest in renewabe energy, I came across solar Stirling Machines, which could have become very popular in remote areas where electricity is scarce. Countries like Indonesia, India, and middle east has abundant solar power, still I do not see Stirling Machines anywhere except couple of experimental setup. I wanted to ask the experts here, what could be the reason? Delayed start is not an issue and hundreds of applications can live with delayed start including waste heat recovery mechanisms. I am planning to build one for the third world countries. Do you see any reason why this may not fly?