This project is an ignition system for estes model rockets. It is powered by a 9V battery, so the rocket engine has a 99% probability of igniting correctly. It has a safety switch, an armed LED, and a launch button. It closely matches the safety specifications of the commercially available ignition system. this project is relatively easy, takes about 1 day, requires drilling, and soldering is optional.

disclaimer: I will not be responsible for any damage, personal injury, or death resulting from the use of this ignition system. always use the correct rocket, engine, launchpad, and recovery system. never allow anyone within 15 feet of the rocket when the ignition system is armed.

Step 1: get the supplies

Here is the list of supplies. They are all available at radioshack.
momentary-on pushbutton switch (launch button) Catalog #: 275-644 2.69
red LED assembly catalog # 276-270 $1.99
SPST lighted safety toggle switch Catalog #: 275-601 $4.99
9V battery clip (only 1 needed-pack of 5) Catalog #: 270-325 $1.99
9V battery Catalog #: 23-875 $3.99
5"x2"x2.5" project enclosure Catalog #: 270-1803 $3.69
4:40 round head machine screws (2 of the 1" length needed-pack of 42 assorted lengths) Catalog #: 64-3011 $1.99
4:40 hex nuts (6 needed-pack of 30) Catalog #: 64-3018 $1.99
#4 flat washers (4 needed-pack of 100) Catalog #: 64-3022 $1.99
#6 spade tounge connectors(2 needed-pack of 10 #6 and #8 connectors) Catalog #: 64-3044 $1.99
45 feet of 18AWG solid wire Catalog #: 278-1223 $5.99
Mini 1-1/4" Alligator Clips (2 needed-pack of 12) Catalog #: 270-380 $2.79
total cost: $36.08
wire stripper
electrical tape
drill with 1/4" and 1/2" bits(
I cleaned up the messy schematic (it works perfectly) and made a one that looks easy to understand.
What program did you use to make that? Please e-mail me a link, sam.greenwald@ymail.com<br />
<p>One question: does one ignition completely drain the 9V battery? Could I use a rechargable one?</p>
I think that one battery would be good for at least ten ignitions. A rechargeable battery should be fine.
<p>Thanks, I'll try to get a rechargable one, I've got a charger that has two 9V battery ports</p>
hi can you make it without the illuminated toggle switch <br>if so could i have a rudimentary drawing
You should make one with a key for safety like the commerciall ones. Nice ible tho :)
Hi how are you? Love the instructable. I am building it tomorrow. Do you know how much current is needed to ignite the engine? I'm just curious is all. I see that if you buy the ignitor from Estes it needs 6v and your version has 9v. Which is fine. It's the needed current i'm confused about. Thank you in advanced for reading this confusing comment.
I haven't specifically measured the current involved, but my understanding is that my version uses a 9v battery to apply more energy (higher voltage) to the ignitor than the standard version and reduce the probability that it fails to get hot enough to ignite the rocket engine.<br>One 9v battery is also easier to mount and connect to the circuit than 4 AA or similar batteries.
Cool. Sounds good to me. Thank you for your reply :).
Does the LED show Continuity for igniter or just power on? I know the cheap Estes controller has light that comes on for testing. I am trying to find plans/ideas for a 12V controller with battery near launch pad and relay control (so can use &quot;speaker wire&quot; in hand for mid power launches. Continuity could be tested at pad before moving back to safe distance for launch. Any thoughts?
On this project, the LED only indicates power. Continuity testing was not a primary consideration in its design.<br>The regular controller presumably does continuity testing by passing a small amount of current through the igniter. I don't know how small that would need to be to not actually ignite the rocket engine.
i think it is funny, they say never allow anyone withing fifteen feet of the rocket, but they give you about 9 feet of cord on the ignition.
what can i use to ignitiate the explosive<br>
The model rockets are ignited by specialized igniters that are available nearby model rockets in stores. Each igniter contains some conductive material with very high resistance. When current is passed through an igniter, it heats up enough to ignite the propellant.
what does a spade tounge connectors look like?and how does it work??
A picture of one is here: http://www.alliedelec.com/Images/Products/Small/512-4268.jpg<br><br>It connects a wire to something else, in this case a screw.
ohw..i get it..cn u make a vid in testing this??email me for some instructions..hehehe..adammoscosa@yahoo.com..NICE WORK BY THE WAY!!
Unfortunately, the device has been disassembled for a while so I can't make a video of it.
Cn i use this to ignite fireworks??(^_^)<br>i really wanna try this!!!THIS IS SOOO COOL!!!!!!!!!!!!Best instructions ever..this is the only instructions that i understood..NICE ONE!!
would it be possible to replace the led with a buzzer that goes off when you press the launch button?
If so, could you provide a schematic?
Ok awesome, so does this mean that I can literally just strip back the insulation on the wires and splice them at one point, or do I need some special adapter that they all are connected with? Thanks
you can just have a battery and a switch but this idea is saver.<br />
I just used a battery and a 2ft long wire &gt;D
Yes, you can do what you described in the comment.
Thanks I am gonna try it tomorrow
You're welcome.
So somebody did make one of this I was going to try make one but now I can try makeing you'res!!!
Ok. The funnythibg is have followed this and built it and it works. I am still trying to understand how the current is flowing through this circuit. Could someone explain to me where the current is entering the circuit, where all it goes in what order once inside the circuit, and finally where does it exit the circuit and does it exit the circuit At more than one place? Help would be appreciated. Thanks
The current enters the circuit at the battery. If the safety switch is closed (on), the current follows one of the following paths: 1: through the LED in the safety switch and back to the battery 2: through the other LED and back to the battery 3: If the launch button is closed (pressed), the current goes through the launch button, through the ignitor in the rocket, and back to the battery. All the current leaves and enters at the power source (battery) - that's what makes it a circuit.
HHHHEEEEEEELLLLLLLPPPPPPP, can anyone answer my post below? thanks.
If I wanted to add a second LED that lights up when the launch switch is pressed where would it go? Thanks, again.
The LED would go between the launch button and the rocket. Be sure to connect it with the correct polarity. A resistor would probably not be necessary because of the resistance of the ignitor in the rocket.
I've just bought the components from Radio Shack UK and the toggle switch that came only has two connection points and a hole on the bottom. What should I do? Thanks
Connect the wire that would go to the 'power' terminal to one of the connection points on the switch. Connect the wire that would go to the 'acc' terminal to the other connection point.
Brilliant, thanks for your fast reply!
ur really good at drawing
Thank you for the compliment.
i need help. when i type in the model number for the lighted safety switch, it comes up with a similar switch that isnt lighted. i know it doesnt matter much but i would just prefer a switch like that.
The description of the switch does not say that it is lighted, but it is. There is a small LED at the end of the toggle that lights up when the switch is in the on position.
OK, thanks.
I am kinda new at this, and I am trying to follow your diagram. One question I do have is for example, when the wire coming from the ground on the safety switch goes down and to the right and beings to go in the direction of the rocket, what does the black dot mean right there where the wire coming from the negative side of battery going to LED crosses it. Does that mean that you splice the wires there? Same thing for the line coming from the ACC on the safety switch going to the launch button, what does that black dot mean? Thanks
The black dot means that the wires should be connected. The ground terminal of the safety switch, the ground wire from the LED, and the ground wire from the rocket should all be connected to the negative terminal of the battery. The acc terminal of the safety switch should be connected to both the launch button and the LED.
YO i have some questions to ask. 1.) i made my own version the other day (with a 9v) and it didnt work. why? 2.) im also new to rocketry and im wondering how far do you have to be from a level 1 or 2 home made rocket using B6-4 engines? 3.) where would be an appropriate place to launch, would an oval do? well i think thats it... for now cheers
the launch site cant have ANY trees or powerlines or anything tall.
looks far more reliable and professional then those crappy Estes igniters
i figured out ur diagram but wat are all the screws and washers 4???
Nice Instructable: 5 Stars.

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