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"Why risk a helicopter and crew when it is possible to insert operators by swarm?" JetPack Aviation asks, using this concept art to illustrate just such an insertion. (JetPack Aviation) ==================================================================== The 20th century was rough on cavalry. While the age of battlefield dominance by horse-borne fighters had long since passed, scouting and charging from horseback remained a part of warfare, especially irregular warfare; that is until trenches, barbed wire, machine guns and armored vehicles rendered that use for horses mostly irrelevant. Cavalry regiments traded in their mounts for armored vehicles, and for the most part the dream of nimble...

Mini gas turbine motorcycle Posted Oct 28, 2005, 11:00 AM ET by Eliot Phillips Russ W. Moore of Bad Brothers Racing has an awesome project on his hands. The motorcycle frame is from a Yamaha YSR-50. Smaller than a standard street bike and larger than a pocket bike it comes with a 50cc engine and is street legal. The gas turbine is being constructed from a Cummins ST-50 usually found in large trucks. The documentation is pretty thorough and covers the build from the beginning. It’s still in progress, the exhaust and pumps still need to be mounted, possibly a...