"New " old material for experimentation. Answered
This video is about Nitinol memory metal engines that are basically Stirling heat engines and work on a very low temperature difference.
I first say this material while watching a video on the founder of 'The Venus Project'. He had small spring that he would stretch out of shape and the heat it - it would come back to its original form and shape. I thought it was neat but didn't see the potential of the material.
This video is from a 1970 CNN broadcast - when CNN was news instead of a propaganda machine.
The material is available on the web somewhere as others have purchased it since I showed them the video. At this point in time I am more of an information messenger and unable to partake in experimentation. So have at it guys and gals.