Hovercraft

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Q: The rules state that mechanical relays are allowed.  What is defined as a mechanical relay, ie: Songle relay board? (section: 3 / paragraph: g / sub-paragraph:  / line: 2)

A: A relay is an electrically operated switch and a mechanical relay is one which operates by having a part that mechanically moves to complete the circuit. Please be aware that some commercially available mechanical relays (or boards with such relays) may include prohibited components such as diodes and integrated circuits, and would not be allowed.