Picture of remote model rocket ignitor
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

Picture of 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(
1-40 of 50Next »
vignesh12305 years ago
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
etywoniak5 months ago

One question: does one ignition completely drain the 9V battery? Could I use a rechargable one?

eatpie365 (author)  etywoniak5 months ago
I think that one battery would be good for at least ten ignitions. A rechargeable battery should be fine.

Thanks, I'll try to get a rechargable one, I've got a charger that has two 9V battery ports

jdelo2 years ago
hi can you make it without the illuminated toggle switch
if so could i have a rudimentary drawing
You should make one with a key for safety like the commerciall ones. Nice ible tho :)
EET19823 years ago
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.
eatpie365 (author)  EET19823 years ago
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.
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 "speaker wire" in hand for mid power launches. Continuity could be tested at pad before moving back to safe distance for launch. Any thoughts?
eatpie365 (author)  RocketMan19573 years ago
On this project, the LED only indicates power. Continuity testing was not a primary consideration in its design.
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.
rurun4 years ago
what can i use to ignitiate the explosive
eatpie365 (author)  rurun4 years ago
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.
PyroWork4 years ago
what does a spade tounge connectors look like?and how does it work??
eatpie365 (author)  PyroWork4 years ago
A picture of one is here: http://www.alliedelec.com/Images/Products/Small/512-4268.jpg

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!!
eatpie365 (author)  PyroWork4 years ago
Unfortunately, the device has been disassembled for a while so I can't make a video of it.
PyroWork4 years ago
Cn i use this to ignite fireworks??(^_^)
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?
chemist7116 years ago
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
temp chemist7115 years ago
you can just have a battery and a switch but this idea is saver.
I just used a battery and a 2ft long wire >D
eatpie365 (author)  chemist7116 years ago
Yes, you can do what you described in the comment.
Thanks I am gonna try it tomorrow
eatpie365 (author)  chemist7116 years ago
You're welcome.
TSC5 years ago
So somebody did make one of this I was going to try make one but now I can try makeing you'res!!!
chemist7115 years ago
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
eatpie365 (author)  chemist7115 years ago
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.
chemist7115 years ago
HHHHEEEEEEELLLLLLLPPPPPPP, can anyone answer my post below? thanks.
sd2295 years ago
If I wanted to add a second LED that lights up when the launch switch is pressed where would it go? Thanks, again.
eatpie365 (author)  sd2295 years ago
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.
sd2295 years ago
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
eatpie365 (author)  sd2295 years ago
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.
sd229 eatpie3655 years ago
Brilliant, thanks for your fast reply!
zoltzerino5 years ago
I made this the other night (not from this 'ible though). the rocket is a Cheap Estes thing, I launched it with a C5-3 engine and it went around 300-400ft.
engineer_016 years ago
ur really good at drawing
1-40 of 50Next »