[Texascavers] Crank-lights

2014-02-27 Thread David
I would like to see a savvy caver reverse-engineer a crank-light specifically designed to power a tiny LED headlamp as your 3rd source of light.

RE: [Texascavers] Crank-lights

2014-02-27 Thread Stefan Creaser
Why does one need to reverse engineer it, David? Are you saying that the ones available to date are not suitable - guess they're not hands free allowing one to use ones hands to cave with, or not robust enough to cope with caving? Cheers, Stefan From: David [mailto:dlocklea...@gmail.com] Sent:

Re: [Texascavers] a caver video

2014-02-27 Thread Nancy Weaver
loved the ending monologue/rant. Hauling tanks back to the entrance on an aborted dive trip in Honey Creek, thru seeming miles of sucking mud, I grumbled to myself that I was going to take up knitting. years later, I did. So there is still hope for the nettlebed explorers.

[Texascavers] RE: [SWR] Fwd: [Mocaves] Mammoth Cave

2014-02-27 Thread Mark.Alman
Time to close it down to all access, especially if cavers are involved. Don't want them nasty ol' cavers spreading WNS! Mark Alman From: swr-boun...@caver.net [mailto:swr-boun...@caver.net] On Behalf Of Bill Bentley Sent: Wednesday, February 26, 2014 7:12 PM To: s...@caver.net; Cave Texas;

Re: [Texascavers] hand-warmth powered flashlight

2014-02-27 Thread Mark Minton
This concept gave me an idea for a possibly more practical application for cavers. Obviously we can't go caving while carrying a flashlight in our hands, but one could perhaps design a helmet and/or cave suit that captures both body heat (thermoelectric) and motion (piezoelectric or

Re: [Texascavers] hand-warmth powered flashlight

2014-02-27 Thread Lyndon Tiu
In the movie The Matrix, the machines use humans as a power source. This is the beginning of the end for us. On Thu, Feb 27, 2014 at 11:04 AM, Mixon Bill bmixon...@austin.rr.comwrote: Very clever. The press release had an error. Humans aren't walking 100 volt light bulbs; they give off ~100

Re: [Texascavers] hand-warmth powered flashlight

2014-02-27 Thread Les Ward
I asked my best friend, a recently graduated electrical engineer that created a thermoregulated charger for his final project, about his thoughts on this idea and this was his response: Energy density is too low. Even LEDs require a few hundred milliamps to provide useful illumination. To get