Picked this up yesterday

Thanks for the link Jack

Today I've had somebody with a grinder remove the bit suggested. Just a slight ridge on a small part of it but I'll file that flat.

Am I right in thinking the union fitting 'sandwich' goes in this order:
Chamber side -----|rubber washer, burst disk(s)|-------- barrel side ...

Gone down a more popular avenue.

Just a quick mock up before thread sealing and fuelling pipe work.
http://i281.photobucket.com/albums/kk222/Tolemans/Mobile%20Uploads/243E6894-E8CC-4140-97A3-B72517D178EE.jpg

1" union - looks like fun trying to seal the tapered edge.
2" chamber with 1" plug for ...

Almost there.

Receiver and 555 box outputs a single 3v 1 second pulse down a 3.5mm jack
Black HV box contains charging circuit, caps, spark gaps and coils.

The doorbell I picked up uses 3 x AA batteries. The circuitry only uses 3v with the other 1.5 topping up power to the speaker.

Due to me already having the components, I opted for a 555 monostable 'one shot' circuit triggered by the speaker voltdrop. I'm powering the 555 circuitry from the 4.5v ...

Latest video http://i281.photobucket.com/albums/kk222/Tolemans/Mobile%20Uploads/th_D3D20893-20C9-4C34-8FEF-DC3A832D7809.jpg

Since my last post I have upgraded to a bigger coil. I got this one from a gas hob, and it has 2 secondary coils. I have joined these to give me one large secondary and lots ...

The capacitor must match or rate higher than your spark gap.

Whilst the over powered circuit is pushing 500/600 volts, the cap is only getting to 200v (in my case) before the spark gap dumps it through the second coil.

I'm using 2 x 400v 0.1 micro farad in parallel to give 400/ 0.2 respectively ...

Hello fellow crazy people.

I know there has been posts on camera flash ignitions but I would like to share my experience. As you can guess my circuit board looked nothing like the one in the very good 'how to' here. Credit for the inspiration.

To start with I found a camera, a non disposable type ...

Hello to everybody at Spudfiles from the Midlands, England.

I have some questions regarding a hybrid I'm planning with my girlfriend. I've built 2 combustion launchers in the past but looking for something that is more of a challenge to build. Of course the increased power is also appealing ...