Second Stage ignition

[Misfit]

Hello, names Daniel. New to the forums and am excited to be here. I am working on designing my two stage rocket and am wondering, what would be the best method for in-direct ignition of the second stage. My plan was to use a perfect flite timer but wasnt sure if it would put out enough juice to light the igniter. Thank you in advance!

 

[tim cubbedge]

Welcome!
I use the aux channel on an RRC3 for sustainer ignition.
Others options are a MARSA54, Telemega or a Raven.

 

[CORZERO]

Please clarify what you mean by "in-direct ignition".

As for juice, you will find your answer in line one of the product description.

https://www.perfectflite.com/MT4.html

 

[Misfit]

in-direct: not being lit by the first stage ejection charge, but by another source

 

[cerving]

The Eggtimer Classic flight computer will do it, as will the Eggtimer Quantum in firmware that's coming out this week. (www.EggtimerRocketry.com)

 

[Adrian A]

Whichever altimeter you use, please do set it up to trigger on altitude, or speed or even better, altitude before a time cutoff, rather than just time from liftoff detection. Over the past few years, several people have gotten seriously hurt by airstart motors that were triggered by a false liftoff detection + a timer. Also, even without a false lifttoff detection, a pure timer could still ignite the second stage after a CATO of the booster, with the upper stage pointed in any random direction (including back toward you)

 

[cerving]

+1 on that. You NEED to be sure that it's going to be pointed up when the second stage lights.