[Discuss] Near-space balloon: Foam ball located and purchased

Mr. Clif EMAIL HIDDEN
Mon Oct 31 13:57:08 PDT 2011


How about a small net laundry or shopping bag. Then it naturally holds 
the sphere together. You can tape the netting to the sides of the camera 
lenses, etc...

      Clif

Rick Osgood wrote:
> Ben, so your idea would be to have the cord come through the sphere via a
> hole in the top and then attach to the inside of the bottom half?  I want
> to make sure I understand your idea correctly.  That sounds like it could
> definitely work and I like that it would remove the requirement for extra
> reinforcement on the top half.  Only downside would be having the rope
> going through the payload where it could get in the way of the electronics.
>
> Laura, I think the zip ties idea could be cheap, simple, and effective.  It
> would be nice to have something that didn't require cutting and replacing
> the zip ties every time we open and close it though.
>
> The last balloon I did, we just had a threaded rod going all the way
> through the center of the payload vertically.  There was a washer and a nut
> on each side to hold the two pieces tightly together.  Then a small
> horizontal hole was drilled through the threaded rod at the top so we could
> stick a sort of hook through it where the line was attached.  The threaded
> rod was nice and strong but it will add more weight and then you have a
> metal rod going all the way through the center of the payload which can
> make the inside electronics layout more difficult.  You can see it in some
> of the photos from this site:
> http://www.toddfun.com/2011/02/20/high-altitude-balloon-launch-2/ .  Here
> is one example photo:
>
>
>
> On Mon, Oct 31, 2011 at 1:29 PM, Laura Harris<EMAIL HIDDEN>  wrote:
>
>    
>> Ohh- that looks good, Ben.
>>
>> One idea for holding the halves together is to use a pair of extra-long
>> nylon zip ties running longitudinally at 90 degrees to each other- grooves
>> formed in the surface would keep them from sliding off. They're strong and
>> light and they avoid the need for any hardware.
>>
>> ------------------------------
>> *From:* Ben Hallert<EMAIL HIDDEN>
>> *To:* Laura Harris<EMAIL HIDDEN>
>> *Cc:* Rick Osgood<EMAIL HIDDEN>; "
>> EMAIL HIDDEN"<
>> EMAIL HIDDEN>
>> *Sent:* Monday, October 31, 2011 1:12 PM
>>
>> *Subject:* Re: [Discuss] Near-space balloon: Foam ball located and
>> purchased
>>
>> May I suggest that instead of attaching the cord to the top, we run it
>> down and attach it to where the battery bay is?  This way the whole
>> thing is 'sitting' on the cord and we can cut any weight created by
>> reinforcements that would reach to the top of the sphere.  Namely, the
>> only 'strength' needed would be at the bottom where it's already
>> planned to exist.  This also reduces risk of retrieving just the top
>> of the sphere.  :)  I've attached a modified version of the drawing.
>>
>> - Ben
>>
>>
>>
>> On Mon, Oct 31, 2011 at 12:51 P.M, Laura Harris<EMAIL HIDDEN>  wrote:
>>      
>>> The ball comes split in half so it's just a matter of holding it
>>>        
>> together in
>>      
>>> flight. I've attached a pic of a sketch showing a preliminary idea for
>>> construction.
>>>
>>> ________________________________
>>> From: Rick Osgood<EMAIL HIDDEN>
>>> To: Laura Harris<EMAIL HIDDEN>
>>> Cc: "EMAIL HIDDEN"
>>> <EMAIL HIDDEN>
>>> Sent: Monday, October 31, 2011 10:54 AM
>>> Subject: Re: [Discuss] Near-space balloon: Foam ball located and
>>>        
>> purchased
>>      
>>> Sweet!  Do you plan to mold something around the sphere?  I'm curious to
>>>        
>> see
>>      
>>> your final design and how we will be able to open it up and mount
>>> everything.
>>>
>>> On Mon, Oct 31, 2011 at 9:53 AM, Laura Harris<EMAIL HIDDEN>  wrote:
>>>
>>> I found a 12" dia hollow polystyrene foam ball and purchased one. Should
>>>        
>> be
>>      
>>> here in a few days. This is it:
>>> http://www.plasteelcorp.com/mm5/merchant.mvc?
>>> This dramatically accelerates the build progress. :)
>>> L
>>>
>>>
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