The fields are:
Delay (0 - 9 sec, default 2.0 sec):
The delay between when the launch detect trigger occurs and when the channel fires.
From: (LDA, Accel, default LDA):
Selects which event starts the timer. LDA causes the timer to start when the LDA altitude has
been reached, Accel causes the timer to start when the Accelerometer launch detect has been
reached. See the Global Settings section for a discussion of the difference between the two.
Velocity: (OFF, 100-800 fps, default OFF):
The MINIMUM velocity that must be reached in order to fire the channel. The default is OFF,
i.e. don't use this check. If your rocket does not meet the minimum velocity at the time of firing,
the channel will not fire and an entry will be logged to let you know that it was because of the
velocity qualification failing.
Check (@Trigger, Anytime, default @Trigger):
When to check for the Velocity threshold. @Trigger is the default, it checks it ONLY at the
time of the timer expiration; if you're not going that fast at that time, the channel will not fire.
"Anytime" means that if the velocity threshold is reached anytime prior to the timer expiration it
will fire the channel.
Altitude (OFF, 100-10000', default OFF):
The MINIMUM altitude that must be reached at the time of the timer expiration for the channel
to fire. The default is OFF (don't check).
Deviation (OFF, 5%-25%, default OFF):
Selects the allowed deviation between the barometrically computed altitude and the
accelerometer's integrated distance, for off-axis detection. See the discussion below.
Pulse Width (1-9 secs, default 1 sec.):
Controls the width of the pulse sent to the deployment channel. If you're using an ematch or an
ematch-derived igniter, you can safely set it to 1 second... ematches typically fire in a few
hundred milliseconds, at most. If you have a nichrome-derived igniter, you may want to set it to
two or three seconds, or even more... you can easily test your igniter with the test feature (see the
Appendix).
Setting Up Two-Stage Airstarts with Your Proton
Before you do anything, you MUST use some kind of simulation program to map out the flight, so
that you have a very good idea of what altitude and velocity your rocket will be attaining at three
critical points: burnout, separation, and sustainer motor ignition. Knowing when these should occur
is the key to a successful two-stage flight.
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