The human-powered helicopter probably doesn't look like what you'd expect. It doesn't resemble a typical helicopter at all. In fact, it looks like it's built using K'NEX. They actually used carbon fiber tubing, styrofoam and a lot of superglue — so, it's not too far off. Looking at it, you'd ...
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It may look like it's built from an erector set, but the X16 Crosby by GearHead Archery is a crossbow unlike anything we've ever seen. At 4.25lbs, it's the lightest crossbow on the market and has a firing speed of 340 fps. Constructed from all carbon fiber, it's not cheap...at all. A $1,999 price ...
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