B. Snyder near Tampa, FL wrote to me about a solar heater he is building with his sister to heat a hot tub. They are making fine progress as...

I had specified what I had hoped to be a readily available, inexpensive and reliable gear motor for the actuator of my DIY tracking paraboli...

We have a large west facing deck which can become unbearably hot on a summer afternoon. I used old tv antenna towers to create horizontal st...