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| D_Hall |
 Posted: 08/06/2008 7:05 AM Post subject: |
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Donating Member
Joined: 07 Feb 2008
Posts: 509
1236.56 Spud Bux
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| McFear wrote: | | so has anything happened since the last rush job. |
Yeah, an insane number of things have happened. We've got what would normally be consider 2 year's worth of work that we're supposed to get done within the next year.
Translation? Gun is on the back burner again.  |
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| SpudFarm |
| Posted: 08/06/2008 9:51 AM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 2094
1180.73 Spud Bux
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| D_Hall |
| Posted: 09/11/2008 21:24 PM Post subject: |
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Donating Member
Joined: 07 Feb 2008
Posts: 509
1236.56 Spud Bux
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Found out today...
It got funded.
Which means it will very soon be an official project.
Which means three things....
1) I won't be able to talk about it once that happens (until press release).
2) It will have a defined schedule.
3) You folks will have contributed to something very real. Thank you. |
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| frankrede |
| Posted: 09/11/2008 22:11 PM Post subject: |
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Sangheili
Joined: 20 Jul 2006
Posts: 2999
548.49 Spud Bux
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AWESOME!
Congratulations!
Goodluck!
Keep us informed onto when its going to be done |
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| LikimysCrotchus5 |
| Posted: 09/11/2008 22:12 PM Post subject: |
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Brigadier General
Joined: 04 Sep 2007
Posts: 1060
2529.44 Spud Bux
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Ok, so since its not official yet, can you give us,
1) a time estimation on completion
Two words "Awesome" |
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| SpudMonster |
| Posted: 09/11/2008 22:48 PM Post subject: |
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1st Lieutenant
Joined: 08 Aug 2005
Posts: 253
195.26 Spud Bux
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| D_Hall wrote: | Found out today...
It got funded.
Which means it will very soon be an official project.
Which means three things....
1) I won't be able to talk about it once that happens (until press release).
2) It will have a defined schedule.
3) You folks will have contributed to something very real. Thank you. |
This is good. Very, very good  |
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| starman |
| Posted: 09/11/2008 23:24 PM Post subject: |
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Big Daddio
Joined: 11 Dec 2007
Posts: 1755
3637.09 Spud Bux
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| Sounds awesome! I assume the being quiet is a security clamp down? Or maybe just keeping quiet on account of hungry competition inside the great industrial complex.... |
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| Gippeto |
| Posted: 09/11/2008 23:30 PM Post subject: |
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Colonel
Joined: 19 Jan 2008
Posts: 677
1668.00 Spud Bux
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Congrats! An officially "funded" , ass kicking , name taking, spud gun. 
One small step for man,... one giant leap for spud kind.  |
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| starman |
| Posted: 09/11/2008 23:33 PM Post subject: |
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Big Daddio
Joined: 11 Dec 2007
Posts: 1755
3637.09 Spud Bux
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| Gippeto wrote: | | One small step for man,... one giant leap for spud kind. |
 Nice one Gippeto.... |
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| MrCrowley |
| Posted: 09/11/2008 23:39 PM Post subject: |
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Blizzard of Ozz
Joined: 23 Jun 2006
Posts: 6137
3165.90 Spud Bux
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Just curious, how much was the funding?
Or will you have to kill me
I can't wait to see this thing finished. |
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| psycix |
| Posted: 09/12/2008 9:37 AM Post subject: |
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Major General
Joined: 25 Jun 2007
Posts: 1830
291.34 Spud Bux
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Awesome!
You will post pics, vids and result data when its done will you? |
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| jimmy101 |
| Posted: 09/12/2008 11:45 AM Post subject: |
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Major General
Joined: 28 Mar 2007
Posts: 1762
7467.36 Spud Bux
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D_Hall that's great news!
Something that might help you...
In my setup I wanted to get the spark event in the data recording stream. You could record the trigger voltage to the HV system but there is usually a delay between when the HV circuitry is triggered and when the spark gaps actually fire. (My cheapo stungun takes anywhere from a couple mS to a few tens of mS to spark once the trigger switch is closed.) You would probably like to know when the sparks actually fired and not when the HV circuit was turned on.
It's not a good idea to have the tens of KV of the sparker anywhere near the analog to digital converter though since it'll fry it for sure. You can just step the voltage down to a more reasonable level with a big ass resistor and a small resistor but that tends to load down the HV a fair amount.
A small neon indicator bulb (NE-2) or a small zenon flashtube can be used as an additional spark gap in the HV circuit. Just wire one in series with the spark gaps and it'll flash when the gaps spark. No spark at the indicator means no spark at the gaps. (But spark/flash at the bulb does not necisarily prove there was spark(s) at the gap(s).) Point a photodiode (or phototransistor) at the bulb and you have a optoisolator that'll handle tens, perhaps even hundreds, of KV. Protect the whole thing from light by enclosing it in an opaque container. Here's my setup in a 35mm film canister. The HV input/output are the screws on the right, you can see the NE-2 bulb near the center of the perf board and the phototransistor is to it's left.
This one is probably good to at least a few tens of KV. The voltage rating is limited by the nearest approach of the wires on the HV side to the wires on the low voltage side.
As I was fidling with the above setup I noticed that it gave a signal even if the light path was completely blocked. So, another way to get the spark signal into the data stream is to just run a length of wire near the spark gap. The spark generates a lot of RF noise and most AD setups, even with only minor amplification, will pick up the RF noise the spark generates. The line input to a PC soundcard easily picks up the RF noise as long as at least part of the wire is not shielded. I'm sure your much more sophisticated data system will pick the RF up as well.
I suspect you may be grounding the "pipe dream" for safety reasons, so the RF from the firing gaps inside the gun might not make it out of the metal gun. The wiring outside the gun to the spark gaps might still make enough RF noise, or you could add an additional gap outside the chamber as a "radio transmitter". I think a NE-2 bulb would work as the external spark gap / radio transmitter and it would be a bit safer than having an exposed spark gap.
Spark gaps were one of the first radio transmitter designs. |
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| Ragnarok |
| Posted: 09/12/2008 12:31 PM Post subject: |
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Lord of Karma
Joined: 19 Dec 2006
Posts: 2542
6837.76 Spud Bux
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Oh dear, I think Killjoy is going to have to give up on the muzzle energy record. 
| MrCrowley wrote: | | Or will you have to kill me |
Working with the government gets you three surreptitious killings every year as a job perk, so it won't have to be him that kills you...
I could do it for you if you'd like. I've hardly killed anyone this month.  |
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| rp181 |
| Posted: 09/12/2008 15:26 PM Post subject: |
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Lieutenant Colonel
Joined: 13 Dec 2007
Posts: 467
52.76 Spud Bux
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| jimmy, thats a good idea, kinda like a rogowski coil (not really though ) |
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| D_Hall |
| Posted: 09/12/2008 17:46 PM Post subject: |
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Donating Member
Joined: 07 Feb 2008
Posts: 509
1236.56 Spud Bux
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| jimmy101 wrote: | | In my setup I wanted to get the spark event in the data recording stream. You could record the trigger voltage to the HV system but there is usually a delay between when the HV circuitry is triggered and when the spark gaps actually fire. |
Yes, we do that routinely on all our tests. We just use an inductive pick-up to gather this information.
Basically our set up is a cardboard tube with a coil of 50ish wraps of wire around it. The high voltage line goes through the tube. When current flows, we get an induced current/voltage in the coil. We record the signal put out by the coil.
Note that in some cases the current from the coil is fed into an old fashioned flash bulb (in addition to being recorded). This provides a blatant visual cue in all videos. |
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