48 replies to this topic

[cooperman435]

I have access to loads of what I believe is hdpe tubing with good thick walls that Im using currently for mortar tubing myself.

Ive tested one of my 2" tubes to destruction and found the parts that seperated from the tube were very thin flimsy stretched peices of plastic and traveled only 10 to 15 metres. To show the strength of the pipe though I had to use 100g of my balsa bp and put 5" mdf plugs in the ends screwed and glued in to stop them popping out.

There is definately 2"id with a wall thickness of 6mm and 3.5"id with a wall thickness of 12mm and a range of others 1 or 2 smaller 1 between and 3 or 4 bigger that Ive not measured yet.

Let me know what ya after and Ill do what I can

[sizzle]

In order to provide a faster service to their customers SP Fireworks have requested that all orders from the UKPS come through myself. So anyone wishing to purchase any products from SP please PM me.

[Wyvern]

I just recieved my 20 hdpe mortars today from pyrogear.net, and very happy i am too.

They have 5mm walls, 18" long and a realy thick plug, cant wait to try them out

Edited by Wyvern, 05 March 2007 - 08:21 PM.

[Wyvern]

Just built the first of the racks to accomodate my mortars





Note the holes so that a pole can be inserted into each side to keep it upright and steady

Edited by Wyvern, 18 March 2007 - 12:41 PM.

[Wyvern]

Lucky old me!! i managed to get some off cuts of HDPE off the guys working down the road from me, about 9ft in all so thats 4x4" mortars, the pluds are drying as we speak

[Caramanos2000]

I already made Fiberglass mortars, figured cost is about $3 to $4 USD per foot of finished mortar with resin and cloth. I would like to try HDPE or UHMWPE. Look at these at: http://www.mcmaster.com/
Part Numbers: 8705K141, 8705K721. Which would be better for 1" shells? And will this platic even work?

[pudi.dk]

Recently found a ~180 cm long 4" diameter pipe.
I identified it as a PE plastic by setting it on fire. If it's floating on water it is either PP or PE. If it drips while burning a sample it can only be PE. Now the question is which kind of PE?

There is a density difference on PE plastics but i don't think I can measure the density precisely.
Anyone got some good ideas on how to find out?

[Wyvern]

i have a feeling that will blow to pieces, it looks far too thin for mortar use

[Caramanos2000]

I would say cut a 8" length and set of a few dummy shells with some lift, then overload it to see what happens when it blows. If it hold and doesnt shatter I suppose your safe.

[pudi.dk]

Hmm.. I might just cut it in two pieces and try some dummy shells with one of them. But that will take some time since I will get killed by the neighbours if I fire it in by backyard.

What is the normal weight for a 4" ? Both round and cylinder.

Edited by pudi.dk, 21 April 2007 - 12:45 AM.

[cooperman435]

Honestly mate I wouldnt even consider that as mortar tubing!

Even if it holds a lift its not to say next time it wont shatter and PE does shatter to my recolection.

HPDE is acually weaker than PE but it has more elasticity so can contain the shock load of a lift charge going off better. Also HDPE will stretch and tear into wafer thin peices (instead of shatter) which only sends out very light weight feathery shrapnel.

[pyrotrev]

It's difficult to see from your photo exactly how thick the walls are on your tube, but to give you an idea the one piece HDPE (not MDPE) mortars I use have a 6.5mm thick wall for 102mm (4") ID. These don't shatter when over stressed, they give various stretchy bits as per Coopermans description. If you're worried about it's nature the firsttest I would make is to cut a short slice off and give it a good clout with a sledgehammer to see if it shatters or not.

[pudi.dk]

Uhm.. it's ~3.6mm

It doesn't shatter, its kinda soft, but hard at the same time.

[sasman]

Eh

Edited by sasman, 29 September 2007 - 07:34 PM.

[maxman]

Sasman, why dont you use fiberglass from sp fireworks they will last alot longer and they are very light.