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Arthur Brown

Member Since 21 Sep 2003
Offline Last Active Aug 31 2019 05:42 PM

#88549 16" Shell of Shells The build and the shooting.

Posted by Arthur Brown on 22 October 2017 - 08:04 PM

It's a while, sorry!


Take a 16" pair of hemis, find which way they fit best (they are never truly spherical!) and cut off the top of one of them.



Drill and tube the fuse holes. and place the 3" shell inserts.


add tissue inside the 3" shell layer. Pour willow stars into the interstitial gaps between the hemi and the inserts. Then add an instant fused 6" shell in the centre and fill the space between tissue and the 6" inner petal with break on rice hulls (available from USA rice growers!). Then attach the upper ring of hemi and build up the tissue, inserts and willow stars to the top, then firmly fit the lid of the hemi.



After an initial pulling together and taping, the ball was passed to someone with a wasp and for the donation of lots of tape, it came back well wrapped and ready to fuse. The magnets were found and removed and the three pieces of time fuse fitted and crossmatched. 3lbs of coarse lift was in a bag and had a long QM leader and fixed to the bottom of the shell. Then I had to plait and affix the handle and the lowering rope so that it could be lowered gently into the tube. When it was all finally dried in the sun it went to the ready box for the dug-in mortar site and was dropped into the mortar in turn. 



Additionally the mortar tube was so far in the ground that there were steps down to the muzzle! A muzzle break would probably have been retained!

#88481 Drying stars

Posted by Arthur Brown on 11 October 2017 - 09:45 PM

An electric dehumidifier will work well. 

#88470 Star Formulas

Posted by Arthur Brown on 09 October 2017 - 06:06 PM

That formula is close to "tiger tail" which performs like a dud on the ground, but performs well when blown through the air. Try the star as you wish to use it and cut it small til you are confident that it will burn out before reaching the ground.

#88424 16" Shell of Shells The build and the shooting.

Posted by Arthur Brown on 27 September 2017 - 01:33 AM

After several years nurturing a friendship, an invitation was made available to me privately, to go o the USA, to a site licensed by BATFE and the local authorities there,  and build a shell!


This was something special of an invitation so it had to be something special of a product. PLUS I had to travel there totally inert, and return by air totally inert too. BUT ingredients could be ordered to be delivered at the site.


Here is the video, This is what a Brit did under a BATFE licence in the USA.



This was my first attempt at a shell! But a lot of design effort went into it. Probably 100 people from the USA were making things under the licence, some were recognised as being good builders and one UK builder made his mark.


I'm in a truckstop  on the way to LAX at the moment, so may not reply for some days.


I'll continue writing up the build with a couple of pictures from home, maybe next week. 


NO I will NOT share the invitation unless I know you well. No I will not advise you what to do. A 16" shell may be above 100gNEQ -I could barely carry that shell.


To all the ELO's watching, enjoy! It's pretty and it was all lawful in the BATFE licensed place. I have the skill to do it but the wisdom to NOT do it in the UK! I have to get through US and UK border protection yet!


#87261 Making thunderflashs ( electronic ignition)

Posted by Arthur Brown on 28 May 2016 - 02:37 PM


ALL small boys should do this!

#87260 Making thunderflashs ( electronic ignition)

Posted by Arthur Brown on 28 May 2016 - 02:23 PM

To exterminate moles look at  The pro tool has been available in the UK, whether it still is...

substantially less that £10 a pop, but boringly non pyro.  IIRC it's oxy propane or air propane.

#86904 Chemicals suppliers?

Posted by Arthur Brown on 09 March 2016 - 07:07 PM

The big issue is that to supply to an EPP certificated individual the vendor has to be and EPP certificated supplier. When you normally send out IBCs of various chems to businesses why would the big companies jump the hoops to become an EPP certificated vendor for the odd 100ml - 1litre. Also the ADR transport of chems is viable in tonne quantities but in 100g bottles expect a £50 surcharge.


Ebay may still be your best bet 


For a smaller vendor the test of "business" may be more flexible but will include business paperwork and the ability to receive packages between 0700 and 1630 -typical goods inwards times

#86019 Tech advice needed

Posted by Arthur Brown on 09 September 2015 - 10:17 PM

Once used for gasless delays, because the reaction is gasless the rate of reaction isn't pressure dependant hence they perform at altitude.

#85791 AP oxidised gerbs and lance Formula

Posted by Arthur Brown on 30 July 2015 - 06:50 PM

One of the "workshop not lab" means of telling the carbon content of steel is to hold a sample to a grinding wheel and watch the sparks, High carbon lots of nice sparks - low carbon nothing interesting. 

#85125 Static electricity inside the firecracker?

Posted by Arthur Brown on 06 May 2015 - 07:23 AM

Small tube salutes or maroons are as safe as you can get in pyro, BUT there is always a tiny risk of incident. Pyro is NOT inert so there is a risk, but it's small. BUT this incident is usually BAD and there is a lot of energy in flash.

#84815 Looking For Any Pyro Work

Posted by Arthur Brown on 18 April 2015 - 08:34 AM

Like every other business, contacts and contracts come to people who can sell. Doing the job is secondary. Many work providers have their usual people for every SFX job, BUT they also keep spare phone numbers of people who they know, who get the call if their first choice isn't available. Your first work will be at very short notice.

#84727 V-pan mortars

Posted by Arthur Brown on 07 April 2015 - 08:49 PM

The pans I saw were about 15" square by about 9" deep in a four sided pyramid made from 6mm ish plate steel. I've also seen cooking woks used! Also short firework mortars ( I have some 10" long 6" DIA mortars that work with BP. I also have some gas powered cannons.)  

#84018 For the locked post about height

Posted by Arthur Brown on 03 January 2015 - 02:09 PM

Strangely I don't care what the break height is! I just care that it's close enough to be interesting but high enough to be safe.

#83746 Explosives, legal amounts?

Posted by Arthur Brown on 15 November 2014 - 01:08 PM

It's far from hobby fireworks, I'd suggest that the chemistry is the easy part, getting planning permission and a HSE licence for the factory and process could be expensive and time consuming. Remember that AP always associates it's self with bad things. 

#83523 Is R-Candy ( Kno3 ) Illegal to make in the UK

Posted by Arthur Brown on 25 October 2014 - 10:07 AM

Well an aircraft in flight may not normally fly below 500ft above the locality, so if you have checked clear of local landing grounds and have good reason to say that your peak altitude will be less than 300ft, then that seems clear. If you have read and understood the ER2014 and the guidance on here then compliance with that should make you legal. Then it's up to you to ensure that you have appropriate safety distances and don't frighten the neighbours or animals.