Jump to content


Photo
- - - - -

Rubber stars


  • Please log in to reply
12 replies to this topic

#1 Foxfire87

Foxfire87

    Playing with fire

  • Full Member
  • PipPip
  • 20 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
  • 20 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
  • 11,485 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
  • 20 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
  • 3,026 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
  • 20 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
  • 20 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
  • 603 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
  • 20 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
  • 3,026 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
  • 11,485 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
  • 81 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
  • 2,495 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!




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users