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Featherweight Blue Jay 2 Plus

Price: $110.00
  In Stock 9

The version of the Blue Jay that can program the outputs to fire e-matches before apogee, for multi-stage flights.

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Product ID FABlueJayplus
Manufacturer Featherweight
Date Added
11/22/2024
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The Blue Jay2 is the new and improved version of the Blue Jay!

The Blue Jay2 altimeter is the easiest rocketry altimeter to install and use. With its built-in magnetic switch, just connect a battery and your e-matches and you are ready to take your rocket to the pad. Turn the altimeter on with the included magnet and the Featherweight UI phone app connects over Bluetooth to show you everything you need to know that the rocket is ready to fly. 

Includes standard magnet and mounting hardware.


The Blue Jay altimeter is the easiest rocketry altimeter to install and use.  With its built-in magnetic switch, just connect a battery and your e-matches and you are ready to take your rocket to the pad.  Turn the altimeter on with the included magnet and the Featherweight UI phone app connects over Bluetooth to show you everything you need to know that the rocket is ready to fly.  Then when you walk up to the rocket after it lands, the phone automatically downloads and displays the flight data on your phone.  The Blue Jay includes the most important features of the Blue Raven altimeter at about half the price.

Easy installation and connections

  • 1.45" long by 0.65" wide, fits into an 18mm Estes BT20 tube
  • 4.7 grams
  • Mount in any orientation
  • Two screw terminals per e-match
  • Mounting holes for 4-40 screws (included)
  • Magnetic switch has approx. 2" range
  • Compatible with any size battery up to 12V (1s lipo recommended)
  • The two outputs are designed for e-matches
    • Apogee channel settings are customizable, with default apogee settings use 3-sensor voting for apogee detection
    • Main channel settings are customizable with default main chute deployment at 700 feet above the pad (AGL)
    • Automatic current limiting to 1 Amp
    • Automatic brownout protection by turning off outputs if onboard voltage drops too low.
    • Continues to operate after power interruption for approx. 15 msec
    • Default main chute deployment at 700 feet

Sensors and data recording

  • 3-axis acclerometer (+/- 32 Gs) and gyros (+/- 2200 deg/sec) used for on-board inertial navigation (raw measurements not recorded)
  • 50 Hz barometric sensor altitude and temperature
  • 50 Hz tilt angle, roll angle, and predicted tilt +3 seconds
  • 50 Hz vertical velocity, down-range horizontal velocity and cross-range horizontal velocity
  • 50 Hz battery voltage and continuity voltage on both outputs
  • 50 Hz recording of all flight events used for deployment logic

Easy operation with the Featherweight UI app

  • The ground test capability remotely tests your charge sizing while automatically recording slow-motion video
  • At the pad, know when your rocket is Go For Launch from your phone screen.  No more listening for beeps on the pad or peering into vent holes.
  • All the data from your flight is automatically transferred to your phone when you walk up to the rocket after it lands.
  • Easily modify the default deployment settings with screens tailored for easy access to the most common functions like low altitude main chute deployment, or go for the custom deployment setting screen to get access to the 22 flight events and thresholds that can control each output channel.  The Plus model allows outputs to fire before apogee for advanced use cases like multi-stage flights.
  • A sophisticated built-in flight simulation exercises all sensors and all outputs.  Verify that your e-matches work with your battery, verify your flight program, and view all the recorded data from your "flight" from your phone.
  • All recorded data can be saved as text files you can share or email with all the capability of your phone.
  • The app provides over-the-air (OTA) embedded software updates to your Blue Raven hardware so that your Blue Raven can take advantage of all the new features and improvements as they become available.
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Search words
altimeter, featherweight, blue jay