9 replies to this topic

[dave]

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

[Karl Mitchell-Shead]

Hmm where to buy cork dust?!

[dave]

it is available in the uk

fine as flour !

[pyrotrev]

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. 

[dave]

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

[Arthur Brown]

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)

[pyrotrev]

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   

[Arthur Brown]

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...

[dave]

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

[PeteyPyro]

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