digger

Somewhere in Europe there is a project to make a 600amp electrolysis cell to make chlorate, and it's actually so easy that it's scary. The concept of permitting people to acquire perc is so infinitely preferable to effectively forcing people to make and rely on chlorate with all it's long forgotten difficulties and incompatiblilties.

 

Hopefully no-one is tinkering with some very small use permitting system while parliament attempts to negotiate Brexit. After that who knows.

 

Business class isn't worth the money -same plane same seats same cold tea, just a curtain to justify £1000 on top of an economy ticket. But yes some parts of the USA are very pyro friendly -but take care for the places that are totally pyrophobic. It's as odd as state and county lines and even Indian reservations.

 

ONE person who thinks I know them can ask for an invitation to a USA make week. ANYONE can join PGI and go there for the week and chat/beer/make all they want. 

Business class is worth the money, maybe the same seats on short hall, but on long hall you get a bed (well a full reclining lay flat seat), proper pillows and blankets and and al a cart menu with a nice wine list!

I used to have loads but it's slowly disappeared, I'll ask about getting more to mill down if you like but can't promise as I'm not sure if it was a one off batch at the time.

I wonder where that came from?

Anyway Tinderbox if you need a kilo or two pm me, you will have to mill it yourself to the required powder (very very easy).

Wow that is cheap, it does not look too bad either. Shame they don't have any of the better rooms still available.

KLM operate a flight from Bristol Via Schiphol. I think it is about £220, I know it is a bit expensive (this comes down to about £60 if you have some air miles and a flying blue card).

The transfers are about 2 hours in Schiphol and the flights are at sensible times.

I don't know if you have been through Schiphol, but as airports go it is great if a little large (I've been though there about 50 times this year).

I highly recommend going from local airports in the UK via Schiphol rather than getting a crappy flight from Stansted or having to turn up 2 hours early at Heathrow, Gatwick or Manchester (along with expensive parking and having to drive to the airport rather than a cheap taxi ride).

At my local airport I usually turn up about 10 - 15 minutes before boarding starts and walk straight onto the plane (must check in online though as check in has to be done no later than an hour before boarding).

1.) Does the society welcome amateur experimenters? Assuming they show appropriate sense and respect regards the various subjects open too discussion obviously?

2.)  how to I go about getting membership? I did look for a subscription option or subbies area..

3.) I can see a lot of content is unavailable to public members like myself so assume there is a subscription process??

1.) Yes, that is one of the things the society stands for. You will need to ensure that you comply with the appropriate legislation, on which there has been extensive discussion on this site.

2.) http://www.pyrosociety.org.uk/join/

3.) See 2

Hope that helps

These are about as simple as it gets. There will be many ways of doing these, but this is what I do.

1.) Place BP charge in a small plastic bag with the ematch and tie off/seal (a couple of stars here can be useful). There is no need to turn this into a maroon by wrapping it endlessly with tape unless you are using pans and not mortars.

2.) Drop down the mortar diameter of you choice. (Yes just a normal fibreglass mortar)

3.) I then put a very thin walled bag into the top of the mortar and fill the powder into it letting it start to slide into the mortar as I fill it.

4.) When the correct amount is in the bag I close the neck, tie it off with tape or a zip tie and snip off the remainder of the bag.

5.) Let the plug of powder in the bag fall to the bottom of the mortar (may need a gentle push).

6.) Fire at will

OK the next questions will be what size charge and how much powder etc.

Well the options are endless here depending on exactly what effect you want.

I like 6" mortars with 2 - 4 kg of powder with about 60g - 90g of lift depending on grade etc, for nice big fireballs rolling 30ft + into the air. You can feel the heat on your face from a good distance away, nice.

Cost well the depends on what you pay for the BHT, from a chemical distributer I would expect up to £4 a kilo, I pay 25p to a £1 and no I'm not telling where I get it from as I don't want any competition for it.

The sequence below is of a 6" lift, it is not pure BHT (about 60%) as I tuned the colour towards the yellow side for this one. You can see the barbed wire fence which is about 20 - 30m from the mortar IIRC for some idea of scale.

Veline wern't designed to be made with acetone.

This was just a later method developed as parlon (chlorine donor) happened to be acetone soluble.

You will note the formula has dextrin in it which is the binder. This is activated with water not acetone. The alcohol in the water mix is just to break the surface tension, try with as little alcohol in the mix as possible as this improves the strength of the finished star.

OK. How I would tackle this problem is to look at the minimum ignition energy required to initiate the flash powder.

There have been plenty of military studies done on this.

The following link is to a military study that details this information. Page 275 has the minimum ignition energy for a relatively standard flash powder.

http://www.dtic.mil/...df&AD=ADA096248

The next stage is to calculate the maximum static charge that the container can generate/hold to see if you can give a positive 100% guarantee.

That leaves a little bit of homework for you to do. However 0.37J is a large charge, so I am guessing that it is not possible to generate a potential difference large enough to generate a spark of this energy. So let us know how you get on with the research.

a red indian rocket? Sorry I could not help it (apache)

Just a quick one

Your equation does not balance, you have kg.m/s^2 on one side and m/s on the other so the = sign can't apply.

how do you intend to solve the force applied by the lifting charge?

The problem is the gap as you are aware.

This is a tricky one, but not unsolvable. I guess you are going to do an annular gas flow calculation about a sphere, I guess Navier Stokes will offer the best modelling possibilities. But with a few assumptions it may be possible to simplify the solution somewhat without affecting accuracy too much.

Are you going to do a gas pressure iteration based upon standard burning rates, gas production and the usual thermodynamics including the adiabatic index.

I have not looked into the modelling in any detail, but I guess you will have to rely on published drag tables to solve the derived fluid flow equations in this instance.

I look forward to seeing your solution.

This is the area that UKPS has spent a great deal of time to resolve.

If you intend to manufacture these devices to a specific pattern each and every time then it could fall under practical use.

If you are designing your own rocket motor for testing then this is not practical use. You could for instance be testing the repeatability of the design and try 10 motors and monitor the results of the flights to determine the process of production is sound. You could also try different grain structure to observe how this alters burn rate and consequently performance of the motor, nozzle shapes, sizes etc etc etc so you should be able to do almost endless experimentation which means that it is not for practical use!.

However you will still have to apply for and get an explosives certificate to allow you to do this as has previously stated in the post.

You definitely won't be getting an explosives licence with great expenditure of time and as Rod says Money

No sorry, I was wrong you do need acquire and keep for 100g. The rules have recently changed.

No way as far as I know to colour the smoke (maybe black is possible), due to the heat.

OK.

You are correct you can effectively make a 100gram (fuel weight) rocket motor with rocket candy without the need for any form of licence for experimental testing purposes. There are no listed ingredients or explosives involved.

The issue could be, where are you going to fly it?

The rocket motor would be considered an unclassified explosive and hence can only be transported by road to a place of testing with the prior approval of the HSE.

Nope you can't add any dye to rocket candy to make coloured smoke. It unfortunately burns to hot, which destroys the dye.

OK, ORDCON is simply "Black Powder Ordnance Conference", which is just a conference that talks about various topics including the legislation and how it affects certain groups.

HT1 is hazard type 1 (the .1 in 1.1), so no big deal as BP has always been HT1 as far as I am aware.

The regulation with respect to the storage of BP and shooters powders has been the same since MSER 2005 (although new version out soon). You can find a copy here http://www.hse.gov.u...priced/l139.pdf check out page 95 onwards for the rules. They are not too onerous. Basically all you need to do is ensure your box is in a locked room, no big hassle.

Hope this Helps

I use manilla tissue paper. It is very thin, but retains more strength than normal tissue and can be glued easily. 

This is the stuff I use http://www.conservat...ory.aspx?id=309