If your project needs a strong, lightweight battery power source, this discounted
Great Planes lithium-polymer 3-cell battery pack could do the trick. Rated at 11.1V 720mAh, this $27.99 battery pack is wired and ready to juice up and go. Tipping the scales at a lithe 1.85oz, it wont weigh you down, either. Tower Hobbies also carries a
Great Planes charger for $24.99 that is ideal for charging these picky LiPo battery packs. Youll also need a 12V battery to supply the charger.—Dave Prochnow

(Image: Tower Hobbies)

It takes two sets of wings to Tango-this unmanned aerial vehicle (UAV) from Draganfly Innovations uses tandem front and rear wings pitched in opposite directions (front set up, rear set down) to significantly increase its stability in the air, which makes it easier to control. Available as either a remote-controlled UAV or a fully autonomous drone, the fiberglass Tango uses a camera [A] in its underbelly and a 2.4-gigahertz radio antenna to send TV-quality live video to your computer.