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MiniTimer3

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MiniTimer3

Price: $78.00

PerfectFlite MiniTimer3 Staging Electronics:

Dimensions: 1.5"L x 0.9"W x 0.5"T
Weight (without battery): 7 grams
Extras: Mounting screws included

Launch 2-Stage Composite-Propellant Motors With Confidence!

Staging composite-propellant motors is different from staging black-powder motors. The reason has to do with how composite-propellant motors, like the Aerotech single use and reloadable motors are ignited.

Composite motors need to be fired-off with an igniter that is inserted all the way to the top of the propellant. Because of this, they cannot be staged using the same techinques as those of black-powder propellant motors. Your rocket needs to carry a complete ignition system inside the rocket to fire off the igniter in the upper stage motor.

MiniTimer3 with battery and igniter.

Simple to wire, all you need is a little screwdriver!

(Note: AA batteries are recommended for igniting FirstFire igniters.)

You will also need a small but powerful battery, and an igniter (these are not included). For composite propellant motors, Aerotech First Fire Jr igniters are recommend. But this staging controller can also fire off all other types of igniters such as the standard Estes igniters.

The type of battery you'll need depends on the igniter used and recomendations are included with the instructions.

Follow this link (youtube video) for a demonstation. This video shows a recent rocket that I built where the minitimer is used to ignite an Aerotech E15 while in flight. Listen for the sound of the second engine lighting one or two seconds after liftoff. Clip also includes onboard video!

Other Features

Can be used with cluster motors!
It is easy to set delay time, and this can be done right at the launch field. The timer is adjustable from 0.6 seconds to over 60 seconds in 0.1 second steps.
There is a beeper on the unit. This does three things:

Provides igniter continuity check - It beeps when you hook up the igniter, letting you know everything is hooked up properly.
Power-up reporting of current delay time setting - After you set the delay time by holding down the "program" button, the unit will beep back the time so you can confirm everything is set correctly.
Post-flight siren - It makes a siren noise after it is done working. This gives you an audible aid to help you find the rocket after it has landed.

High accuracy digital time setting is retained in EEPROM memory even with power removed. This means is that once you set the time, it stays in memory forever (or until you set in a new time).
Uses secure screw-down terminal blocks for battery and igniter. This means there is no soldering required to hook anything up. All you need is a small screwdriver to attach the wires.
Rugged "surface-mount" construction and internal self-diagnostics assure reliability.

Technical Specifications

Operating voltage: 4.8V to 10.5 V (3.0V to 4.8V at half current rating)

Operating current: 1.0 ma no continuity, 3.0 ma with continuity

Maximum firing current: 97.6A for 1 ms, 64.5A for 10 ms, 33.9A for 1 second

Continuity check current: 75 uA/V

Timing range: 0.6 second to over 60 seconds in 0.1 second steps

Timing accuracy: +/- 3% typical

Operating temperature: 0C to 70C