Click to enlargePerfectflite MiniTimer4 Digital Timer MT4A

The Perfectflite MiniTimer4A is a precision digital timer that can be used for ignition of sustainer motors in multistage rockets and ignition of air-started auxiliary motors. It can also be used for accurately timed deployment of recovery devices in lieu of the sometimes variable delay times associated with the motor's built-in delay grain. Delay time can be set with 0.1 second resolution via an on-board pushbutton.

The MiniTimer4A includes a built-in, accelerometer-based, IC trigger for automatically initiating the delay on launch. The only external items necessary are a 9V battery and an on/off switch. Igniter continuity is reported via a built-in beeper, which doubles as a post-flight locator siren. Maximum speed and maximum acceleration are also reported automatically.

The MiniTimer4A's extremely high current capability allows the use of virtually any igniter type, as well as multi-igniter clusters. When powered by a suitable battery, firing 50 ematches simultaneously is possible!


-Easy to set delay time is field adjustable from 0 to over 99.9 seconds in 0.1 second steps.

-Can be configured to trigger on main motor ignition or burnout.

-Includes on-board accelerometer.

-Beeper provides audible igniter continuity check and powerup reporting of current delay time and battery voltage. Also reports maximum acceleration and speed of rocket after flight, along with siren to aid in rocket location.

-High current capacity allows use of multiple igniters in clusters.

-High accuracy digital time setting is retained in nonvolatile memory when power is turned off.

-Uses secure screw-down terminal blocks for battery and igniter.

-Rugged SMD construction, stringent QC testing, and internal self-diagnostics assure reliability.

-Backed by a full three-year warranty.


-Dimensions: 1.2"L x 0.9"W x 0.6"T

-Weight: 0.25 Oz

-Operating voltage: 5V to 16V

-Operating current: 4.5ma

-Max. firing current: 100A for 1 ms, 65A for 10 ms, 45A for 1 second

-Trigger Type: Accelerometer

-Timing range: 0 seconds to over 99.9 seconds in 0.1 second increments

-Trigger threshold range: 2G for 0.5 sec to 5G+ for 0.2 sec

-Timing accuracy: +/- 2% typical

-Acceleration limit: 15G (best accuracy)

-Acceleration limit: 23G (accelerometer)

-Acceleration limit: 100G (timer function)

-Operating temp.: -40C to 85C

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