Just finished with several months of experimenting and trying to find a more efficient Thermoelectric generator.  Each unit is sized at 19 mm x 15.8 mm x 9.5 mm and produced an average of .735 volts at 132 degrees Fahrenheit (55.55 degrees Celsius). Wired 13 units together to produce 9.56 volts. Pretty happy with the results, will have to create a more efficient way of wiring and mounting if I decide to move forward with this tech. Almost finished with my new rocket motor design, will soon be 3D printing pieces and will use the prints for casting. It will take time to save up for the metal casting equipment, so hopefully by the middle of 2017 I will have some more updates. Have a new baby about to be born so extra time will be hard to come by.