Part 4 is here: http://www.youtube.com/watch?v=xw5f4QQTyFk
Inspired by George Plhak and Daniel Rojas (GreenPowerScience), this Parabolic Trough Solar Water Heater is to be one in a bank of four to heat about 80 gallons of water. It is designed to track the sun in a dual axis movement mode. In this video the rotating frame has been completed.
ancelgray AT YAH00.C0M
Andrew Ancel Gray