<p><BR/>Replying to:<BR/><DIV CLASS='Discussion_PostQuote'>The power produced by a windmill (or more strictly a wind turbine, since I doubt you will be wanting to mill grain) is proportional to the density of the air/atmosphere, and the cube of wind velocity. Since the atmospheric pressure on Mars is only about about 8 milliBar (compared to 1 Bar on earth), for a given wind speed a wind turbine on Mars would produce less than a hundredth of the power it would produce on Earth. <br />Posted by newtons_laws</DIV></p><p> </p><p>Ah this can be countered by making the vanes on the "windmill" proporational to the push created by the Martian winds. If what you say is correct, then a vane would have to be 4x as heavy to be used on Mars in comparission to the wind vaned used here on Earth. I can see it now, an Earth made vane would simply bend in different angles until it came off of the shaft and spun away at mach 1.<br /></p>