[NRV Rocketry] Questions about outfitting an avionics bay with power-safety flags

[Kathryn Worley]

*Hi Thomas,
*
*Thanks for  the updates.  Please **un**-subscribe us from your mailing
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*Best regards.
*

On Wed, Jul 6, 2011 at 12:33 AM, Thomas Weeks <tweeksjunk2 at theweeks.org>wrote:

>  This is a question for you high power guys who have been shooting H and
> up birds for years.
>
> Background:
>
> -------------
>
> So my first HP rocket is about ready to fly... and I plan on using it to
> get my L1 (H) and L2 (J) certifications. The L1 is no problem. Up, pop,
> float down. But as most of you know.. L2 certification also requires a
> written test (no problem) as well as "Active recovery", or a way of
> measuring your altitude and ejecting multiple chutes at precisely the right
> times to safely recover my rocket.
>
> Well.. I've now mostly built my avionics bay, or "e-bay" and wired in a
> GWiz LCX flight computer:
>
> http://www.facebook.com/photo.php?pid=1049573&l=3b9cc7e689&id=1844028171
>
> http://www.facebook.com/photo.php?pid=1052820&l=fde4de7d63&id=1844028171
>
> http://www.facebook.com/photo.php?pid=1052821&l=8f9d1e56c2&id=1844028171
>
> http://www.facebook.com/photo.php?pid=1052825&l=878029acee&id=1844028171
>
> http://www.facebook.com/photo.php?pid=1052823&l=079bcf0bff&id=1844028171
>
> http://www.facebook.com/photo.php?pid=1052824&l=d39d643ca4&id=1844028171
>
> Here are some other pictures of other people's e-bay construction and
> products:
>
> http://www.vanderbilt.edu/USLI/2011/media.php?gallery=jan_19_2010
>
> http://www.apogeerockets.com/electronics_bays.asp
>
> http://www.rocketryplanet.com/content/view/2960/95/#axzz1RIL7aYxk
>
> My Question:
>
> -------------
>
> Anyway.. my question for Bob and other experienced Rocketeers..
>
> What should I use for my flight computer's power safety switch?
>
> So you're supposed to have a power arming safety circuit to ensure that
> your ejections charges don't blow before you launch the thing... They
> usually look something like this:
>
> http://aeroconsystems.com/cart/products/RBF4-47-10.html
>
> And are hung off something like a 1/8th " audio jack (where the normally
> closed circuit is open when the audio plug is in... and removing it
> completes (or closes) the circuit.. and powers up the computer). However.. I
> hear that the flight vibration can really make those switch contacts bounce
> around, which can reset the flight computer.. which leads to big expensive
> crashes. So a lot of folks use these high-G rated switches like this:
>
> http://aeroconsystems.com/cart/products/PCB_Screw_Switch-110-0.html
>
> or
>
> http://www.aeroconsystems.com/electronics/switches.htm
>
> Not nearly as cool/sexy as the "yank it out" audio plug that I want to use.
> :)
>
> So what do you other HP folks recommend? Slide switches? Hard wired
> toggles? Audio jack/plugs?
>
> Tweeks
>
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>


-- 
*~Kathryn Worley
*(540)998-8752
50piggietoes at gmail.com
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