Induction coils- help needed badly!

[A-BOMB]

I'm trying to made an induction coil, and I need some help with it have a battery its 9.6 volts and I don't know it amperage. What I need to know is how many wraps of wire I have alot of 16 and 20 gauge wire a 5 inch iron rod for the core. My other problem is what wire for it I don't what a tazer I want to make this for a remote controlled spudgun tank it uses up to many rocket inginters (it uses one each fire and its semi-auto. So please help all those electronily inclined and for the timer I was thinking a old cd attached to a motor and brushes and peices of tinfoil on top and there spaced to it turns it on and off to producedes a spark.

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[J]

Get hold of a car ignition coil, all the work's done for you. You would need a good few thousand turns on that core to get a reasonable spark, winding these aren't fun!

As for a switch, use a relay in oscillating mode (you should be able to work out how to wire it up this way).

J

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[A-BOMB]

Thanx, J put I tried that already the coil and battery and spudgun on the RC tank was to heavy for it to move. And I thought I saw on your site that a coil should have a 1 turn to 100 and I have the time and the wire and an old motor coil rewraper that I got at an aution for returning the winding of motor and magnets.

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[J]

That's reminded me that I REALLY must update my site to include the new design.

If you're using an induction coil, it's really the total number of turns that counts rather than the 'ratio' (there is only one coil, tapped near the bottom). The coil works on back-emf as you probably know, so the higher the inductance the better. High inductance = lots of turns.

You'll have to experiment. If you're worried about weight, you could use a motorbike coil. The relay weighs virtually nothing, and the battery pack (are you using a model racing type?) you'll need anyway for the tank.

The type of coils I use for my stun gun use ferrite cores, and this gives them much better efficiency than Iron cored transformers. They don't require as many turns on the primary, and thus as many on the secondary to get the same power out.

The design on my site should work, even a small voltage multiplier should ignite a FA mixture.

J

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[A-BOMB]

J, would a coil from a weed eater work?
You see that the eletricity for the coil comes from a magnet that goes past it on a wheel would I be able to just work a coil from a old brigges@straton to work it has only two wires one to the spark plug and another one.

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[J]

Explain 'Weedeater'.

J

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[PYRO500]

I think he means one of the magneto coils.

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[EventHorizon]

Weedeater=string trimmer

http://www.northwestpowertools.com/lawnandgarden/trimmers/gt2000.htm

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[J]

Ahh, a strimmer :-)

I doubt you'd get much of a spark using a motor coil for this, but it might be enough to set off the mixture.

J

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[A-BOMB]

Since, I got my trimmer working again I'm not going to use that coil so i'll take the coil of my neinghbors wood spilter its a briggs@straton 8HP electric start would that work?

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[J]

Why don't you try it and tell us? I've said what I think about using a coil from a motor.

J

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[A-BOMB]

OK, J I'll get the coil and tell you what happens if it works.

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[A-BOMB]

Well J, I didn't nick the coil but made my own I made a video of the sparks made by them it on Ctrl_c's FTP named induction coils 1-3 by A-BOMB.avi look at it and see how my first coil verevs my 3 compare.

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[J]

It looks good, did you use the spinning CD idea for 'chopping' the DC? Can you give us some details of how you made the coil? It looks like quite a thick arc.

J

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[A-BOMB]

My first coil uses that cd thing I talked about, but the second and theird ones both use different systems. The second one uses an old electronic metranome, I ajusted the speed regulator to make the arm move faster than usual and I glued a washer to it and used and old nail finder to a scr and to the battery and coil. The theird coil I made used a brushing and terminal end from an old motor and a toy motor to turn it and that one works the best. And the coils the first coil I used a modified transformer that I rewound, the second the same and the theird I wound one on a 2.75 inch ferrite rod that I got out of an old cb radio and wound it with 3589 turns on 18 gauge on the secondary (it was all the wire I had) and a primary of 15 turns of 10 gauge. And the first ran off of a tripple A battery the second of a 9volt, the theird off a 9.6 volt RC car battery and boy does that last one hurt when you get shocked with it!

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