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Member Since: March 1, 2006

Country: United States

  • The batteries are lithium primary cells that behave well under heavy loads and at low temperatures, and are about half the weight of alkaline cells. We use them on all our balloon flights. The voltage drops more than the data sheet implies at -40C, but they do work well in the cold. LiPo may beat them for energy density, but certainly not for simplicity.
    The FAA regs for a balloon ("unmanned free balloon" in their terminology) are pretty easy to meet if you fly the <12lb total payload string <6lb in any one package on a latex balloon during daylight hours, but my understanding is that they are decidedly unfriendly toward AAVs, so autonomous rendezvous is out.

  • I've done this unintentionally almost every time I've fabbed a board at home. |:
    My favorite technique for holding headers and most other parts in place for soldering is some "normally closed" tweezers.

No public wish lists :(