[aprssig] Tracker3 9600 baud balloon tracker beta offer
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
> aprssig mailing list
> aprssig at tapr.org
More information about the aprssig