Choose a well-ventilated yet wind-free area to work in, such as a garage with doors and windows open for airflow ... Step 2: Sand the pipe. Lightly scour the PVC pipe’s exterior by hand with ...

[NightHawkInLight] a.k.a. [Ben] recently built an awesome high power air cannon out of PVC pipe. PVC air cannons ... this solution – it was hard to open and somewhat unergonomic.

Wind energy usually means elaborate set up with wind turbines stretching along the horizon. But Usha-Urja, a humble device ...