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cork fireball doughnut


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#1 dave

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Posted 02 August 2016 - 09:53 AM

check this video out.
the doughnut is at about 4-08 secs
 
looks like a relatively simple welding job to create



#2 Karl Mitchell-Shead

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Posted 03 August 2016 - 07:00 PM

Hmm where to buy cork dust?!

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#3 dave

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Posted 03 August 2016 - 07:53 PM

it is available in the uk ;)

fine as flour ! ;)



#4 pyrotrev

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Posted 12 September 2016 - 04:26 PM

Quite pricey though. I wonder if normal wood flour (£13 for 5Kg delivered) would be as good?? Might try some in a 3" mortar if I can scrounge it from my local equestrian people. 


Trying to do something very beautiful but very dangerous very safely....

#5 dave

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Posted 12 September 2016 - 05:54 PM

i doubt if wood flour would give the same result,

but for that price its cheap enough to try

 

another one that has been used which may be cheaper is walnut dust



#6 Arthur Brown

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Posted 12 September 2016 - 06:51 PM

As with all SFX the videos don't tell the full story. No mention is made of the propellant -could be flash based or BP based -could be an article or a substance.

 

LOTS of fine powders will fire when suspended in air. Coffee whitener is one, bulk flour is another -ask any bakery (a bakery near me had a flour dust explosion in a bulk tank and the smell of burnt toast was all pervading for several days)


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Keep mannequins and watermelons away from fireworks..they always get hurt..

#7 pyrotrev

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Posted 13 September 2016 - 08:53 PM

i doubt if wood flour would give the same result,

but for that price its cheap enough to try

 

another one that has been used which may be cheaper is walnut dust

If you search for "sawdust cannon" on YouTube it would seem to have some promise. Time to buy some I think  <_< 


Trying to do something very beautiful but very dangerous very safely....

#8 Arthur Brown

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Posted 13 September 2016 - 10:52 PM

With things to burn for SFX the first need is cheapness! A "source" for cheap fuel is essential. I did a 40 litre fireball for someone once, but the fuel was Jet Fuel from an aircraft that was going into maintenance and would be emptied and that fuel not reused so the fuel was available FOC! 40litres at pump price would have been £50 at the time.

 

Cremora is a coffee whitener easily and cheaply available in the US -a bit like Coffee Mate in the UK but having a cheap and secure source of a fine dust is always a help. Cork dust is good if you have a cork factory near you, likewise Walnut shell dust -is there a local source...


http://www.movember.com/uk/home/

Keep mannequins and watermelons away from fireworks..they always get hurt..

#9 dave

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Posted 08 August 2017 - 08:34 PM

Quite pricey though. I wonder if normal wood flour (£13 for 5Kg delivered) would be as good?? Might try some in a 3" mortar if I can scrounge it from my local equestrian people.


where do you get wood flour for that price ?
it has other uses too

#10 PeteyPyro

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Posted 03 September 2017 - 12:58 PM

Sawdust is usually too coarse, and sourcing the finer wood flour can be difficult




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