Flight notes for UBSEDS2

Flights.md

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+## UBSEDS2
+
+Launched from EMF 31/08/2014. Joint flight with CUSF (JOEY rtty/turbo)
+and SUSF (UKHAS repeater).
+
+AAA battery and surgically attached 16MHz crystal. Measured 80mA
+current draw, no power saving for the ublox 6.
+
+Revision C Atmel SAM D20 microcontrollor (bit-banged SPI)
+
+140g free lift on a 100g Hwoyee.
+
+4 hours battery life, much less than expected. Low temperatures?
+
+Watchdog enabled, 64 seconds timeout (based on ULP32k oscillator, so
++-50%)
+
+

Notes.md

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+## PCB Weight ##
+
+The density of FR4 is 1,850 kg/m^3. If we assume a PCB area of 12*50 =
+600 mm^2...
+
+For a 1.0mm PCB: 600 * 1.0 * 1.85 = 1.110g
+For a 1.6mm PCB: 600 * 1.6 * 1.85 = 1.728g