doc: Document the Apogee Lockout setting

[fw/altos] / doc / altusmetrum.xsl

diff --git a/doc/altusmetrum.xsl b/doc/altusmetrum.xsl
index 885c573e15b3b684ad5540753405bd467f192d34..39b3998a5154f35e35fa9042b56222b79340e736 100644 (file)
--- a/doc/altusmetrum.xsl
+++ b/doc/altusmetrum.xsl
@@ -2183,6 +2183,20 @@ NAR #88757, TRA #12200
           way quite happily, including Keith's successful L3 cert.
         </para>
       </section>
+      <section>
+       <title>Apogee Lockout</title>
+       <para>
+         Apogee lockout is the number of seconds after boost where
+         the flight computer will not fire the apogee charge, even if
+         the rocket appears to be at apogee. This is often called
+         'Mach Delay', as it is intended to prevent a flight computer
+         from unintentionally firing apogee charges due to the pressure
+         spike that occurrs across a mach transition. Altus Metrum
+         flight computers include a Kalman filter which is not fooled
+         by this sharp pressure increase, and so this setting should
+         be left at the default value of zero to disable it.
+       </para>
+      </section>
       <section>
         <title>Main Deployment Altitude</title>
         <para>