Release Notes for Version 1.8.1

Bdale Garbee

<bdale@gag.com>

Keith Packard

<keithp@keithp.com>

- This document is released under the terms of the - - Creative Commons ShareAlike 3.0 - - license. -

Version 1.8.1 includes an important bug fix for Apogee Lockout -operation in all flight computers. Anyone using this option -must update firmware.

This release also contains a change in how flight computers -with accelerometers deal with speeds around and above Mach -1. In previous versions, the flight computer would completely -disregard the barometric sensor above 330m/s (around Mach -1). Now, the data from the barometric sensor is reduced in -effect without ever going away entirely. This prevents early -drogue deployment for flights which spend considerable time -above Mach 1.

1.8.1 also contains a couple of minor fixes for AltosUI when -analyzing saved data files.

1. AltOS

AltOS Bug Fixes

-Handle time value wrapping in Apogee Lockout -correctly. Without this, apogee lockout would sometimes -prevent any drogue charge from firing. -
-Change Kalman filter on flight computers with accelerometer -to continue using the barometric sensor even at high speeds -to avoid unintentional drogue deployment during -deceleration. -

2. AltosUI and TeleGPS Applications

AltosUI New Features

-Add new Huge font size to make text even bigger on high -resolution monitors. -

AltosUI Bug Fixes

-Prevent some crashes when reading older saved flight data -for graphing or KML export. -
-Load frequency preference at startup. The loading code was -broken, so you’d see only the default frequencies. -