Featherweight
 
Altimeters LLC
More performance.  More affordable.
The Raven Altimeter

August 8 update:  The Raven has a new revision, Raven2, based on a higher-capacity flash chip.  The new Raven2s are in stock and ready to ship in the 70G/35G version.    Look for a 38mm Featherweight Av-bay, including li-polymer battery, coming soon.

Raven Features:

Lots of high-quality recorded data:
  • 400 Hz axial accelerometer, +/- 70 Gs
  • 200 Hz lateral accelerometer, +/- 35 Gs
  • 250 G single-axis accelerometer available as an option
  • 20 Hz Baro data, +/- 0.3% accuracy!
  • 20 Hz voltage on each of 4 deployment outputs
  • 40 Hz output current
  • 20 Hz high-precision temperature sensor
  • 20 Hz for All flight events used for deployment logic.
  • Flight counter
  • All output program settings
  • Accelerometer calibrations used during the flight
  • Pad altitude ASL
  • 8 minutes of high-rate data per flight + 45 minutes

4 high-current, programmable outputs:

  • 9-Amp outputs compatible with all batteries from a single Li-Poly cell to a 14V pack.
  • Default output settings:
    • Mach-immune, accelerometer-based apogee deployment
    • Main deployment at 700 feet
    • Baro-based backup apogee deployment
    • Backup deployment 1.5 seconds after main deployment
  • Additional user-selectable output logic options can be selected in combination for each output:
    • Accel > user value 1 (ignition detection)
    • Accel < user value (burnout detection)
    • Filtered pressure increasing (baro apogee detection)
    • Filtered pressure decreasing (for staging)
    • Time > user value (simple timer)
    • Time < user value (vertical staging check)
    • Altitude < user value 1 (low altitude deploy)
    • Altitude > user value 2  (vertical staging check)
    • Altitude < user value 3 (landing detection)
    • Velocity < 0 mph (apogee detection)
    • Velocity < user value 1 (Mach inhibit)
    • Velocity > user value 2 (staging input)
    • Time delay after other conditions met (backup)
    See FIP page for programming screenshot
  • All of the above flight events are recorded at 20 Hz in the Flight Event Register, great for verification of the altimeter functions in test flights or simulated flights.
  • Screw terminal with 0.1" spacing
Only 1.80" long x 0.8" wide x 0.55" thick!

Simulated test flight:

A sophisticated built in test exercises all sensors and all outputs with a realistic simulated flight.  Verify that your ematches work with your battery, verify your flight program, and view all the recorded data from your "flight" without leaving your computer.
Compatible with the Featherweight Interface Program

The Raven has full functionality with either end up!


Available with an option for an on-board A23 battery holder and power switch.

Visible and audible readout of individual channel continuity and battery voltage.


User-calibration of accelerometer
Comparison:
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