If you search the outer reaches of the internet you will find all sorts of web sites and videos purporting to answer to free energy in the form of perpetual motion machines and other fantastical ...

Humans have been sailing various seas and oceans for thousands of years, and using boats for potentially even longer than that. But as a species we wouldn’t have made it very far if it was only ...

In the previous issue we visited Cornell University’s wind tunnel to see how wind flows around an asymmetric spinnaker. We learned a lot, of course, especially the importance of being dynamic with our ...

This year’s anticipated launch of the Planetary Society’s "Cosmos 1" spacecraft may usher in the long-awaited age of solar sailing. The performance of such spacecraft could be optimized with a simple ...