Fire Burst
#1
Posted 12 October 2009 - 11:09 PM
Have been asked to create a large fireball effect (ground based) for an organised pyro meet.
Have at my disposal quantities of powerful flash powder, was considering using this as the burst perhaps underneath a large container of fuel.
Thoughts?
Chief
www.illusionfireworks.com - A SKY FULL OF MAGIC!
#2 Guest_PyroPDC_*
Posted 12 October 2009 - 11:56 PM
also please introduce yourself in the new members thread at let us know a bit about yourself and if you have any experiance with pyro.
Edited by PyroPDC, 12 October 2009 - 11:57 PM.
#3
Posted 13 October 2009 - 01:12 AM
But you need a small gerb (even a Titanium based garden fountain will do the trick.) to light above it to be sure that it lights the fuel, otherwise sometimes it lights and sometimes it doesn't. I have done this a few times. Also if the ground is stony, you best pick out all the stones you can in and around the hole the bucket sits in for safetys sake.
Petrol is VERY hot. Is has a high calorific value (which makes it good for it's proper job)so be a good distance away. Try mixing petrol with about 20% diesel to get a rolling mushroom cloud type effect with black smoke (assuming this is a daylight firing).
You will want to be at least 70 metres (minimum)away for safety including the heat given off for about 5 litres of fuel.
Otherwise as suggested you can use BP. Take a large mortar tube with a small BP maroon in the bottom. Put a double thikness bin liner in the mortar tube and add fuel. Tie the bin bags up and fire.
#4
Posted 13 October 2009 - 09:32 AM
http://www.flickr.co...57617343147696/
Would that do? : )
Edited by Creepin_pyro, 13 October 2009 - 10:04 AM.
#5
Posted 13 October 2009 - 02:31 PM
Posted my credentials in the 'new members' section, hope this instills some confidence
Yes i like the mortar idea, may be worth a try small scale with a 2" tube first. Although the 'fireball' is very column like and direct.
I think the mayo bucket would give a better rolling mushroom cloud type fireball. Maybe place a few bags of flour ove a FP charge close by for spread.
Chief
www.illusionfireworks.com - A SKY FULL OF MAGIC!
#6
Posted 13 October 2009 - 04:00 PM
I doubt you'll get a particularly impressive effect from a 2" gun. You may not get quite the same rolling fireball by rupturing a bucket from underneath...
EDIT:
There are a few commercial solutions which might be worth considering. Try HFM pyro for starters if you're interested.
Edited by Creepin_pyro, 13 October 2009 - 04:05 PM.
#7
Posted 13 October 2009 - 04:33 PM
So essentially i need a fairly low order burst to project a bag of fuel upwards and out of confinement for the best fireball?
(2" mortar would be for small scale test)
Chief
www.illusionfireworks.com - A SKY FULL OF MAGIC!
#8
Posted 14 October 2009 - 07:04 PM
Other than that, biggest fireball i saw came from a 10 inch air canon, was basically fitted with a heating element at the end, then filled with fuel, and pointed skywards.
Worked quite well, huge mushroom clouds, and depending on the fuel used, you can either have a fast, hot fireball, or a slower burning (dirty) fireball.
#9
Posted 15 October 2009 - 09:34 AM
This is for UKFR's annual meet.
Posted my credentials in the 'new members' section, hope this instills some confidence
Yes i like the mortar idea, may be worth a try small scale with a 2" tube first. Although the 'fireball' is very column like and direct.
I think the mayo bucket would give a better rolling mushroom cloud type fireball. Maybe place a few bags of flour ove a FP charge close by for spread.
Chief
The problem with flour is that is not very bright as a fireball compared to the diesel/petrol mix and doesn't always light. If you can get some Bakelite resin powder, Naphthalene or red gum that is much better but I would still recommend using BP rather than FP to lift and light it. The problem with FP is that is sometimes causes the fuel (liquid or powder) to travel so fast that the drops or particles move away from each other too quickly to allow the flame front to propogate through the fuel and you end up with it not lighting.
You might consider firing the powdered fuel through the petrol fireball from each side so that the petrol fireball lights it. If you were using 3 mortar tubes it might look like this ( /I\ )with the central tube having the liquid fuel and the outer ones the powdered fuel. If you have a flashy firing system I would suggest firing the powder fractionally before the liquid to ensure that it is passing through the liquid fireball as it begins.
#10
Posted 15 October 2009 - 12:20 PM
This will hopefully be ran through FireByWire, so what do you think, 0.5s delay between powder booster and liquid fuel?
Have had a lenghty conversation with another 'forum top trump' who is going to attend and assist, think we pretty much have it worked out.
Hopefully have video and photo's in just over a week
Chief
www.illusionfireworks.com - A SKY FULL OF MAGIC!
#11
Posted 15 October 2009 - 12:25 PM
They are right at the end of the video
www.illusionfireworks.com - A SKY FULL OF MAGIC!
#12
Posted 15 October 2009 - 05:35 PM
for relatively small fireballs is powdered tar.....very orange and smokey and quickly consumed.
the traditional napthalene obviously works but is a bit smelly.
i have also come across, blends of hexamine and acroides resin, again with blackpowder lift.
propane gas canons give good firebursts but are expensive
dave321
#13
Posted 18 October 2009 - 09:07 PM
#14
Posted 18 October 2009 - 09:30 PM
This makes me think of El Diablo : )
#15
Posted 19 October 2009 - 04:21 AM
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