Jump to content


Photo
- - - - -

Rubber stars


  • Please log in to reply
22 replies to this topic

#1 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 25 posts

Posted 05 October 2019 - 01:57 PM

I have been trying to make red and green rubber cut stars following ned gorski formulas from sky lighter. First batch looked good but when my shells break only a few actually ignite. Took my time on next batch and really milled and screened it all, but they still seem hard to light, with a lighter anyways, when I put the stars on top a fuse or in a pile of coated rice hulls, they ignite, so do the first batch. So I'm not sure why they're not igniting when shell breaks? Can anyone point me in the right direction?...the second batch i also used finer magnalium thinking it should help it ignite and burn faster

#2 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 25 posts

Posted 05 October 2019 - 02:00 PM

Forgot to ask, should a lighter held to the stars easily ignite them?...lighter takes a while to ignite

#3 Mumbles

Mumbles

    Grandmaster

  • Admin
  • PipPipPipPipPipPipPipPipPipPip
  • 11,517 posts
  • Gender:Male
  • Location:Above You

Posted 06 October 2019 - 02:06 AM

Are you priming the stars? This is typically a layer of comp on over the star which ignites easily and can burn pretty hot. Metallic fueled colored stars like you're making will effectively require some priming.
Just so you guys quit asking, here is the link to the old forum. http://www.xsorbit2....forum/index.cgi

The sky is my canvas, and I have 2,113 pounds of powdered paint in the workshop.

#4 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 25 posts

Posted 06 October 2019 - 05:28 AM

Yes Iam doing a hot prime and a parlon black powder prime after that

#5 Arthur

Arthur

    Firebreather

  • HE Qualified
  • PipPipPipPipPip
  • 3,125 posts

Posted 06 October 2019 - 05:56 AM

How do you cut the stars? If you roll out a sheet of comp then cut it, try dusting the table surface with prime, and dusting the top surface of the star mix with prime.

 

If the star formula permits, use a prime of BP ingredients and maybe add some silicon metal powder. 



#6 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 25 posts

Posted 06 October 2019 - 06:58 AM

I dont have any silicone powder at the moment, and it must be something stupid I'm missing or doing wrong, I dust both sides of patty with the hot until it no longer looks wet, then cut them, put them in a big tub, finish off the hot prime while swirling the stars, I wet with denatured alcohol after they're cut to pick up the prime, then same method for adding the parlon black powder prime. They look good and dusty when I'm done, rough outside surface. Then when its show time they dont work very good, this is all new to me so maybe with more tries they will get better. But I followed the instructions closely that were posted on sky lighter, I bought their red rubber screen sliced star kit, should they ignite easily when a lighter is held to them?...I completely line the inside of my 3 inch shells, fill with coated rice hulls, then it looks like only a handful are igniting.

#7 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 25 posts

Posted 06 October 2019 - 07:06 AM

Is the shell breaking too hard?..I wrap my 3 inch 7 times with 1 inch tape, nice thud, loud break, but being new i dont know if this is too much maybe? Thanks for everyone's suggestions so far and input, and any more is greatly appreciated.

Edited by Foxfire87, 06 October 2019 - 07:06 AM.


#8 pyrokid

pyrokid

    Pyrotechnician

  • HE Qualified
  • PipPipPipPip
  • 611 posts
  • Gender:Male
  • Interests:Pyro, soccer, guitar.

Posted 06 October 2019 - 10:13 AM

The Parlon content of the outer BP prime seems suspicious to me. Chlorine donors typically have some flame inhibiting properties. Stars have their highest velocity immediately after the break and it may be that they are being blown out while this poorly optimized outer prime layer is burning. I would move to replace the Parlon in your prime with red gum if you are binding with alcohol. Unless you have some aversion to water or the formula precludes its use, I would use an H2O - dextrin system for the prime.



#9 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 25 posts

Posted 06 October 2019 - 10:35 AM

No honestly this is just what the skylighter site calls the prime, there is no parlon in the prime though, I just thought it was called this because it's being used with a parlon star?. Sorry if I made it confusing but this was what I read so I call it "parlon black powder prime" because that is how they worded it

#10 Arthur

Arthur

    Firebreather

  • HE Qualified
  • PipPipPipPipPip
  • 3,125 posts

Posted 06 October 2019 - 10:50 AM

Fast primes sometimes burn away before sufficient heat has been passed to the star. Clean burning primes usually burn to hot gasses that go away. Prime with bp ingredients and silicon (it's a metal used in powder form) burn slowly and the silicon forms silica as a fused droplet on the star which passes lots of heat easily.


  • pyrokid likes this

#11 Mumbles

Mumbles

    Grandmaster

  • Admin
  • PipPipPipPipPipPipPipPipPipPip
  • 11,517 posts
  • Gender:Male
  • Location:Above You

Posted 07 October 2019 - 07:24 AM

There's a handful of skylighter rubber star tutorials. Do you have a link to the one you're following?
Just so you guys quit asking, here is the link to the old forum. http://www.xsorbit2....forum/index.cgi

The sky is my canvas, and I have 2,113 pounds of powdered paint in the workshop.

#12 davidh

davidh

    Pyromaniac

  • HE Qualified
  • PipPipPip
  • 96 posts
  • Gender:Male

Posted 07 October 2019 - 05:20 PM

They should light when you simply show them the lighter. Your prime is bad.



#13 OldMarine

OldMarine

    Firebreather

  • Donator
  • PipPipPipPipPip
  • 2,498 posts
  • Gender:Male
  • Location:Lebanon Tn
  • Interests:Interests? Everything interesting!

Posted 12 October 2019 - 10:25 PM

I've shot dozens of shells with cut rubber stars with only BP prime with good effect.
These stars should light if you merely show them a photo of a flame.
I suspect you need to double check you chem quality and formula.
Come on! Name one other hobby in which you cheer as your money and hard work go up in smoke!

#14 dynomike1

dynomike1

    Firebreather

  • Donator - HE
  • PipPipPipPipPip
  • 1,224 posts
  • Gender:Male
  • Location:W. Tn.
  • Interests:Blowing Beaver dams, Shooting Cannons, Hunting, making fireworks.Buying guns.

Posted 19 October 2019 - 07:20 AM

How hard are they to light with a torch?


There are very few problems that cant be solved with explosives.
                             Explosives are a bang up job.

#15 memo

memo

    Pyrotechnician

  • Donator
  • PipPipPipPip
  • 724 posts
  • Gender:Male
  • Location:central america
  • Interests:gold mining, now fireworking

Posted 19 October 2019 - 08:48 AM

agree with old marine, if all is good, and a prime is used, maybe just maybe your breaking your shell too hard and blowing them blind.



#16 Mumbles

Mumbles

    Grandmaster

  • Admin
  • PipPipPipPipPipPipPipPipPipPip
  • 11,517 posts
  • Gender:Male
  • Location:Above You

Posted 19 October 2019 - 09:30 AM

I wouldn't be surprised if that's the cause or partly responsible. A thicker priming layer can often do the trick to cure that. The stars can allow down a bit more and stay out more easily. This is still a little strange though.

If you split a star in half, how thick would you say the priming layer is?

Firefox, for what it's worth your manufacture probably sounds fine. 7 layers is fairly reasonable for a 3" shell. It's all going to depend on the burst charge as well of course.
Just so you guys quit asking, here is the link to the old forum. http://www.xsorbit2....forum/index.cgi

The sky is my canvas, and I have 2,113 pounds of powdered paint in the workshop.

#17 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 25 posts

Posted 25 October 2019 - 06:28 PM

https://www.skylight...ed-rubber-stars
Here's the link, not exactly sure how thick the prime would be but I have to hold a flame to them for about 15 seconds before they ignite. made a few batches since my last post and they seem hit or miss. Some work in shells, it mainly seems to be the red star that wont ignite from the shell burst. My other colors are lighting. But they all require me to hold a flame to them to ignite on the ground out of the shell

Edited by Foxfire87, 25 October 2019 - 07:02 PM.


#18 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 25 posts

Posted 25 October 2019 - 06:32 PM

I'm making 3oz of hot, 3oz of the black powder prime, and the majority of both seem to stick to the stars, there's some left or stuck to the bottom of my tub but the stars themselves really seem to build up from time of cutting to finishing the primes. But the inconsistency of them is really frustrating and I'm just not sure what I'm doing wrong

#19 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 25 posts

Posted 25 October 2019 - 06:34 PM

And all my chems have been ordered from fireworks cookbook, pyrochemsource, and skylighter

#20 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 25 posts

Posted 26 October 2019 - 09:57 AM

I'm using acetone and denatured alcohol, could I be making them too wet? If I add silicon to the prime, should I eliminate the magnalium that the formula calls for? Or just add it in? These formulas call for nitrates instead of carbonates, would the carbonate formula be easier to ignite? Or as stated before, it seems to be more a problem with my prime.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users