Second stage ignition

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JNUK

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I was looking through photos from the last NARAM and found this model:



If I am right, the second stage is ignited electronically. Could anyone explain how it is done on that type of models. I mean a type of the igniter, battery, control circuitry.

Any relevant schematics, drawings pictures are welcomed.

Thanks.
 

gdiscenza

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If that is for the internationals, the second stage is ignited through traditional gap staging.

Trip had a similar model at the July NOVAAR meeting.

G.D.
 

kjohnson

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On this particular model, the upper stage ignition was done using a Zitnan staging timer and a Quest Q2G2, which you can see poking out of the top of the booster.

Most of the US team uses something other than traditional gap staging, be it a timer (in the big booster that gets dropped quickly) or a wick of vitamin T, or simultaneous ignition like a cluster.

They CAN be done with traditional gap staging and that works great when using Estes motors. The euro motors aren't as reliable for that.

kj
 

JNUK

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Thank you very much for you response

What type of batteries is used to power the igniter?

What is "a wick of vitamin T"?

Are there any drawings/ photos of such models available on-line?
 

Rocketboy25

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Is it possible to get more information about,non electronic, staging in FAI contest rocketry.... ?
Regards from Germany ,
Jochen
 

kjohnson

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I've seen two non-electronic methods used.
1- a tube with a little black powder at the top that connects the 2 motors, is triggered by the booster burning out.
2- a small fuse in the upper stage motor lit by a 2nd igniter the same time as the booster is lit.

Both take a lot of practice to get right.

The gold medal winner for S1B at the WSMC used pretty much gap staging as deceived in the handbook of model rocketry, with a little BP on the booster to aid in upper stage ignition.

kj
 
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jadeross

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Good to your goal! I believe that it will be successful because you sounds enthusiastic in the things you do. I would love to see more photos of it!
 

astronwolf

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Both take a lot of practice to get right.
...and some engineering. The internal components need to be vented properly so that the flame front from the burned-out booster doesn't just pop the upper stage off.
 
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