A few pics...

I do like the simplicity of a piezo ignition. I figured I already needed a battery for the fan, so a stun gun seemed to be a reasonable choice.

I tried piezos from lighters, and they are pretty unreliable and weak. I never did try the larger piezo units found in gas grills.

The BBQ grill ignitor I ...

I like to use the LM2577 DC-DC Adjustable Step-up Power Converter Module - you can find them on eBay for just a few bucks.

I use it to run the fan on 3 or 4 AA batteries.

Really small - I put it in an altoid tin with fan and ignition safety switches.

'Tis true. Most of the sellers have a list of restricted locations in their ad.

If a friend were to disassemble the stun gun and send you the HV unit, it could then be considered an ignitor. It is no longer a stun gun any more.

$9.79 with free shipping. Save money buying several at at time - I got a three pack for $26.00

http://www.ebay.com/itm/VIPERTEK-VTS-880-15-Million-Volt-Self-Defense-Rechargeable-Mini-Stun-Gun-/370781131349?pt=LH_DefaultDomain_0&hash=item5654471255

I don't have any relationship with this seller ...

10x - Yikes!

I suspect your potato disintegrates almost instantly.

And then scorches on to the inside of the barrel.

I'd love to see it, though.

I ran HGDT for the pistol - 246 FPS. Not nearly as fast as it's bigger brothers, but it will make my son happy.

I fooled around thinking about a hybrid, but I went for simplicity.

The cannon at 4x/90 psi should deliver a supersonic spud - or else mashed potato spray. That might be interesting ...

The cannon uses a propane metering system connected with an air tool quick release coupler. Much lighter to handle that way - it already looks pretty goofy with the 10 foot barrel attached.

The rifle uses butane measured by a syringe. The pistol will be the same.

The cannon and rifle use little 1 ...

Hi All,

I've been lurking long enough - time to go legit.

I've made two spud guns with the advice gathered here and elsewhere.

I've been using the VIPERTEK VTS-880 Stun guns found on ebay for about ten dollars or so for ignition sources.

What's nice about these is that they are small, and the HV ...