[aprssig] Tracker3 9600 baud balloon tracker beta offer

Robert Bruninga bruninga at usna.edu
Thu Dec 19 07:29:49 CST 2013

> 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.


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