[aprssig] Tracker3 9600 baud balloon tracker beta offer

Scott Miller scott at opentrac.org
Thu Dec 19 10:21:58 CST 2013

You've said that before, but my own results haven't been as good. 
Sounds like a good question to put to the YL - she did her PhD work in 
heat transfer.  Maybe we can come up with some models and run a few 
experiments to see how they match up.


On 12/19/2013 5:29 AM, Robert Bruninga wrote:
>> it finally froze after sunset.  A fast-rising balloon in daylight
>> would probably be fine, but I'd still recommend more than
>> the 1/2 inch foam that we used for insulation.
> For daytime flights, insulation is not needed at all.  I've never
> understood this concentration on foam especially -white-foam when the
> balloon payload is in -bright-sun the entire flight.  Just put the payload
> in a clear plastic coke or water bottle.  Provides flotation as well as
> solar heating.
> Our first one back in 1990 something had 3 layers of concentric clear
> plastic bottles and it overheated.  Have flown a few small ones since, but
> still need to do a well instrumtend flight to find out if one-layer is
> sufficient.  My present plan is a clear very light weight plastic water
> bottle and the payload (painted black) wrapped with one layer of bubble
> wrap inside the bottle.
> This also satisfies the ballistic cushion requirement also.
> Bob, WB4APR
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