Affordable & real pyro explosion effect!! - Page 2 at DVinfo.net

Go Back   DV Info Net > Special Interest Areas > Techniques for Independent Production

Techniques for Independent Production
The challenges of creating Digital Cinema and other narrative forms.


Reply
 
Thread Tools Search this Thread
Old October 18th, 2005, 02:52 PM   #16
Major Player
 
Join Date: Jun 2005
Location: Houston, TX
Posts: 344
I always wondered if I could fill a balloon with some volatile lighter than air gas and then light a fuse going up into the tied balloon, then let it go...

It'd make a nice round explosion. Would look good on film, too! Pseudo-Death Star explosion, anyone?
Stephen Finton is offline   Reply With Quote
Old October 19th, 2005, 09:47 AM   #17
Major Player
 
Join Date: Aug 2005
Posts: 272
7 parts aluminum powder to 3 parts potassium perchlorate. This stuff needs no containment. It will detonate uncontained, but I have used cardboard tubes as a vessel, sealed them with an electric match and set them off electrically. It is extremely stable.

Lots of boom. A tube about 4 inches long and 2X the diameter of my thumb placed inside an old top loading VCR, vaporized the thing. Take a plastic butter tub (like the ones that Blue Bonnet or what have you come in) and fill it half way up with Coleman gas (white gas) for the obligatory cinematic fireball.

This goes off on cue as it is electrically triggered. We built a makeshift camera sheild out of plywood and a clear polycarbonate plate that the camera looked through.

I will try to dig up one of our test videos that we did this with.
__________________
B-Scene Films

Last edited by Shaughan Flynn; October 19th, 2005 at 12:07 PM.
Shaughan Flynn is offline   Reply With Quote
Old October 19th, 2005, 11:13 AM   #18
Regular Crew
 
Join Date: Oct 2005
Location: Las Vegas, NV
Posts: 67
Just make a nice intense blue flame with an acetylene torch, this will provide the proper mixture of acetylene and oxygen. Then snuff the flame and fill a balloon with the gases and tie it off.

When we were younger we tied toilet paper to these things and lit them on fire - the waiting was very intense as these babys are LOUD. Our first experiment set car alarms off over 1/2 mile away. Our later expirement that went extremely wrong turned off all the streetlights in my neighborhood and the shockwave rattled houses over three miles away.

I can link to pictures if anybody is interested.
Alec Lence is offline   Reply With Quote
Old October 19th, 2005, 11:22 AM   #19
Major Player
 
Join Date: Aug 2005
Posts: 272
Alec, you are a man after my own heart.
__________________
B-Scene Films
Shaughan Flynn is offline   Reply With Quote
Old October 19th, 2005, 11:49 AM   #20
Regular Crew
 
Join Date: Oct 2005
Location: Las Vegas, NV
Posts: 67
LOL, I'll take that as a yes --


This was two party balloons, toilet paper fuse
http://community.webshots.com/photo/...56146386TruQrr

Seven party balloons, taken from 1/2 mile away
http://community.webshots.com/photo/...56146422Xrwlon
make sure to view full

I don't have pictures of what my garage looked like after a balloon exploded while we were filling it as we were all standing in the street, blind, deaf and screaming. So like I said, be careful.
Alec Lence is offline   Reply With Quote
Old October 19th, 2005, 12:08 PM   #21
Major Player
 
Join Date: Aug 2005
Posts: 272
LOL sweet!

What did you take those pics with tho? A cell phone?
__________________
B-Scene Films
Shaughan Flynn is offline   Reply With Quote
Old October 19th, 2005, 01:31 PM   #22
Major Player
 
Join Date: Jan 2005
Location: Vero Beach
Posts: 392
Next thing you know you guys will be farting in a bag and touching that off......
Jim Montgomery is offline   Reply With Quote
Old October 19th, 2005, 02:36 PM   #23
Major Player
 
Join Date: Jun 2005
Location: Houston, TX
Posts: 344
Quote:
Originally Posted by Jim Montgomery
Next thing you know you guys will be farting in a bag and touching that off......

Did you know that the elderly produce elevated amounts of static electricity due to reductions in skin oil? This coupled with increased amounts of gas due to weaker consitutions has been pinpointed as the cause behind spontaneous human combustion.

I will post pics of my grandfather on that fateful Christmas morning of 1993...





;)
Stephen Finton is offline   Reply With Quote
Old October 19th, 2005, 02:51 PM   #24
Regular Crew
 
Join Date: Aug 2002
Location: Atlanta, Georgia
Posts: 1,892
Quote:
Originally Posted by Jim Montgomery
Next thing you know you guys will be farting in a bag and touching that off......
Hahahaha LMAO!!

You can produce pure hydrogen by placing tin foil in a bottle filled with drain cleaner (caution: reaction gets very warm!). Then place a balloon over the neck and allow it to fill with the hydrogen. When at capacity, pinch it off, remove from the bottle, tie it off with a string (the fuse) and light the string and it will go off way up in the air as hydrogen is lighter than air and did I mention, very flammable. When the fuse burns up to the balloon, there should be a nice flash in the sky.


Quote:
Originally Posted by Shaughan Flynn
7 parts aluminum powder to 3 parts potassium perchlorate.
Potassium Chlorate mixed with table sugar produces an intense flash when the mixture is lit but apparently neither will ingnite seperately. If it is placed in a plastic straw, a continuous whitehot flame will shoot out like a blow torch or the shuttle's solid rocket boosters.

Sodium metal will violently snap, crackle and pop emitting colorful flying sparks as it rapidly decomposes when placed in a dish of water. It will decompose slowly or melt when left exposed to air.

Last edited by James Emory; October 19th, 2005 at 06:52 PM.
James Emory is offline   Reply With Quote
Old October 20th, 2005, 08:02 AM   #25
Major Player
 
Join Date: Aug 2005
Posts: 272
Here is an example of the Perchlorate solution with white gas. That's a VCR by the way.

http://www.netnance.com/boom.avi
__________________
B-Scene Films
Shaughan Flynn is offline   Reply With Quote
Old October 20th, 2005, 09:04 PM   #26
Regular Crew
 
Join Date: Aug 2002
Location: Atlanta, Georgia
Posts: 1,892
The explosion sound was similar to those in Looney Toons cartoons. At first, I couldn't open the video. I then right clicked, hit properties and saw a button that said something like unlock. It played after that. I've never seen that option before.
James Emory is offline   Reply With Quote
Old October 21st, 2005, 01:26 AM   #27
Regular Crew
 
Join Date: Oct 2005
Location: Las Vegas, NV
Posts: 67
The acetylene bomb "boom" is similar in quality to a 10-gauge shotgun blast at point blank with a resonance similar to the most horrific thunder rumble imaginable, depending on the size of the bomb.

btw, that was a circa-2001 Sony Handycam, bitmap extracted from Premiere, not a cellphone ;-)
Alec Lence is offline   Reply With Quote
Old October 21st, 2005, 06:27 PM   #28
Wrangler
 
Join Date: Jun 2002
Location: Vancouver, British Columbia
Posts: 8,308
You know, somewhere in Hell, Darwin is saying "go ahead, light that fuse, prove me right... wuss."

Anyway, I'm scratching my head here trying to figure out what kind of disclaimer to add to this thread.

So far my favorite is:
PLEASE FEEL FREE TO TRY THIS AT HOME. WE WON'T MISS YOU.
__________________
Need to rent camera gear in Vancouver BC?
Check me out at camerarentalsvancouver.com
Dylan Couper is offline   Reply With Quote
Old October 22nd, 2005, 10:31 AM   #29
Major Player
 
Join Date: Aug 2005
Posts: 272
Quote:
PLEASE FEEL FREE TO TRY THIS AT HOME. WE WON'T MISS YOU.
ROFL!

That was shot on Hi-8 in the late 90s. A buddy of mine is a gaffer that sets up those kinds of effects and he was the one that built the explosives. We were situated about 1/8th of a mile away using his standard explosive trigger box driven off of a car battery.

As soon as we had blown one off we had to look at the tape because from our vantage we could not see much. The location is the Mojave desert about 90 minutes north east of the city of Mojave. Pretty much desolation and no one for miles.

We also had some fun with Primacord, but that is a subject for another day :)
__________________
B-Scene Films
Shaughan Flynn is offline   Reply With Quote
Old October 26th, 2005, 11:07 AM   #30
Inner Circle
 
Join Date: Jul 2002
Location: Centreville Va
Posts: 1,828
I have a sudden urge to build a beercan bazooka, wonder why.
hehehe
Joe Carney is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > Special Interest Areas > Techniques for Independent Production

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 11:48 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network