24 replies to this topic

[dr thrust]

yep i understand there rigorously tested, but yer know "sh** happens" and misfires occur i nearly got wiped out by a pin wheel! i lit it stood a couple steps back... BANG!!.. NOTHING LEFT ! but a pin
i'll just remenber to lite and "run like the wind"

Edited by chris m, 19 April 2010 - 07:52 PM.

[rocketpro]

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Edited by rocketpro, 06 August 2010 - 11:04 AM.

[phildunford]

A certain major UK display company had to send all it's imported 3" shells back to China recently, because they were breaking at random heights...

Sh** does indeed happen!

[pyrotechnist]

Other words dont trust imports lol and use good old English produce, I wish!

[dr thrust]

well opened it up anyway, the propellant grain is black powder based no resin binder, weighing in at 23g( minus the clay nozzle)
interestingly enough i was expecting it to be a simple end burner, but indeed it had a core 40mm in depth, by 4mm dia, fused its full length
another interesting point was at the other end in which they had dispensed with the clay end-plug and the problem of engineering a pass-fire in to it in the production process, by using hard clay flakes mixed with the blackpowder,making in affect consumable end-plug, clever! anyways here's the pics so you can see what im bangin on about!

[Vic]

I would think the bp clay mix would act like a cheap and easy delay.

[rollie]

I would think the bp clay mix would act like a cheap and easy delay.

On pyroguide it does state that the Chinese commonly use clay mixes as delays

[dr thrust]

clever stuff indeed, a wonder how one would go about producing the clay flakes?

[pyrotechnist]

Instead of clay use sawdust, dried grass, or for the flakes of clay I assume they press blocks of clay and break them with a hammer. Maybe the clay is bound with wax to keep its form.

[CCH Concepts]

could you not grate the clay with a cheese grater?