[Discuss] Near-space Balloon: A couple more drawings
Sun Nov 6 11:28:36 PST 2011
Something came up this morning and I will not be able to attend the NSB meeting
this afternoon. I have included my notes in hope that a discussion will be
started on these subjects. If someone could please take real basic notes or an
outline of the topics discussed today so that I can rehash with Rick on Monday,
that would be great. We could possibly start making brief notes for each
meeting and post to the wiki for those that can't make the meeting. We could
start an agenda for the meetings also.
1. Secondary Tracking Device
2. Battery Considerations
3. Radar Reflector
-Secondary location device
In my research I have found many sites that have strongly recommended a
completely seperate tracking device. in the chance that the primary fails, stops
transmitting, or battery dies. I am a huge proponant for redundancy and think
this would be a good addition to the payload. We could possibly hang it from
the primary payload, although that would not be as sexy. I have been looking
into both radio beacons and cheap cell phones for this purpose. I have most
recently been researching cheap GPS enabled prepaid phones with additional
software. One piece of software that I found was www.mapmytracks.com. This
would be a simple and cheap way for a backup tracking system.
Many sites reference using only non rechargable lithium batteries in their
payload. When concidering the temperatures found in high altitude (-40C) non
rechargable lithium batteries are the best choice. Has anyone else done any
research on this subject?
The last item I have for discussion is whether or not we need to include a radar
reflector to our payload. I have found that many near space balloon projects
include a reflector. This will make it possible for aircraft to detect our
balloon. I thought the FAA guidelines required a reflector, however I have seen
several balloons that did not include one.
From: Ben Hallert - Vipmail <EMAIL HIDDEN>
To: Laura Harris <EMAIL HIDDEN>
Cc: "EMAIL HIDDEN"
Sent: Fri, November 4, 2011 1:34:38 PM
Subject: Re: [Discuss] Near-space Balloon: A couple more drawings
If we call it Creswell Maker Space, then our enemies would have a more difficult
time finding us.
On Nov 4, 2011, at 11:51 AM, Laura Harris <EMAIL HIDDEN> wrote:
I almost put a break in the line to indicate "some unspecified long length". :)
>I was going to ask about the name this evening at the shop- I picked up
>'society' in one of the emails. I'll change all instances.
From: Rick Osgood <EMAIL HIDDEN>
>To: Laura Harris <EMAIL HIDDEN>
>Cc: "EMAIL HIDDEN"
>Sent: Friday, November 4, 2011 10:38 AM
>Subject: Re: [Discuss] Near-space Balloon: A couple more drawings
>Looks good Laura, thanks for working on that. Looking at the second image (the
>one that includes the balloon) I want to mention that normally people tend to
>stick a 20-30 foot piece of rope between the parachute and the balloon. I can't
>recall the exact reasons for this but it seems to be the usual way of doing
>things. I realize it's impractical to include that in a diagram like that
>Also, I'm not sure where "society" came from but it might be worth mentioning
>that our group's name is actually Eugene Maker Space.
>On Fri, Nov 4, 2011 at 10:17 AM, Laura Harris <EMAIL HIDDEN> wrote:
>The plan x-section gives a better picture of the reinforcing rib layout. The
>main assy dwg is a statement of the obvious but still nice to see how it all
>goes together :)
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