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Sunrise yellow


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#61 Pirotex

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Posted 10 November 2018 - 03:22 AM

Sulphurstan, How many percent of water did you add to pump stars?

I don's try make this stars without dextrin

I dry this stars with 20-25 С air (40-60 % humidity in the room)


Edited by Pirotex, 10 November 2018 - 03:26 AM.


#62 Sulphurstan

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Posted 10 November 2018 - 11:12 AM

Pyrotex , I just put enough water in order to have a thick dough, just enough to get it as cut stars. Didn't weighted the water. Once I'll shoot your comp bonded with PVB, I'll let you know how it worked out

#63 kingkama

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Posted 11 November 2018 - 03:55 AM

I tried substituting dextrine with phenolic resin and the result is not bad, burning time reduce a little cause the phenolic effect on combustion, but in few hours stars are hard. May a mix of dextrine and phenolic solve both problem. I found this stars are better if made like comet (pressed) whit a max 10% of water and alcool.

#64 dynomike1

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Posted 15 November 2018 - 08:37 AM

Should have been using straight Alcohol with Phenolic.

With Dextrin i use straight water, and seems like my stars are harder.

I love Sunrise Yellow.


Edited by dynomike1, 15 November 2018 - 08:38 AM.

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

#65 memo

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Posted 15 November 2018 - 12:59 PM

I have only made these stars by pressing and use dextrin and 5 % water  then in the dry box and have never had a problem. found a 25 kilo bag of sodium nitrate locally now I don't have make my own. a lot more yellow stars in my future.



#66 OldMarine

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Posted 15 November 2018 - 07:08 PM

My favorite yellow, much better than mixing colors to get it.
Come on! Name one other hobby in which you cheer as your money and hard work go up in smoke!

#67 memo

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Posted 15 November 2018 - 07:24 PM

Lloyd is going to hate you for that pat



#68 OldMarine

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Posted 15 November 2018 - 09:01 PM

The sodium is an optic yellow so he's cool with that I think. It's the blended ones that get his dander up.
I could have that backwards but although he might kill me, he can't eat me.
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Come on! Name one other hobby in which you cheer as your money and hard work go up in smoke!

#69 PhoenixRising

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Posted 20 November 2018 - 07:24 AM

I still have a bag of Baking Soda labeled "Lloyd's Favorite" from a couple years ago, so that probably means he hates it.   :P


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#70 Mike71

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Posted 26 March 2019 - 11:23 AM

Can the sunrise yellow be cut and rolled
If so im guessing 75/25
Thanks

#71 Carbon796

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Posted 26 March 2019 - 02:21 PM

If you're using dex and cutting them, just use straight water. If you're rolling them the alcohol/water blend can help to start the cores.
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#72 Mike71

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Posted 26 March 2019 - 02:56 PM

Thanks carbon796
Alao i am reading about dying issues with them so should i replace dextrin with phenolic resin if so are the percentage the same as dextrin and use acetone to wet it... please excuse my lack of knowledge
I am 3 years into pyro as a hobby and have only been using valines system

#73 Carbon796

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Posted 27 March 2019 - 02:14 AM

Typically 6% PR is a recommended minimum, but 5% is probably close enough.

I would use denatured alcohol, not acetone.

Switching to PR will add a decent amount of fuel value, over the dex based comp. Which may lead to the comp being slower or sluggish, being as its sodium nitrate based.

#74 rellim

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Posted 05 April 2019 - 08:04 AM

Cryolite is cheap and nearly insoluble in water. I got a pound of it at a local ceramics supply shop for $4.50. I made some Hardt yellow 3 with it and it was incredibly bright. I didn't have any suitable Al so I substituted 16.2 MgAL for the 19 Al.



#75 kaotch

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Posted 06 April 2019 - 10:05 AM

@rellim

I am working on Hardt yellow 3 but it is very hard to ignite. What prime did you use and what mesh size on the MgAl.

Thanks



#76 rellim

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Posted 11 April 2019 - 07:02 PM

@kaotch

I probably used monocapa + bp. I fired them from a small mine which gives easier ignition than in a shell. A dozen stars lit up the whole backyard. My MgAl is -200 +325.

 

I don't have a copy of the Hardt book but I recently found this:

Hardt Yellow Star #5
This star burns yellow.

Barium nitrate 29
Potassium perchlorate 29
Cryolite 9.5
Magnalium (-200 mesh) 9.5
Red gum 7
Parlon 12
Dextrin 4

Edited by rellim, 11 April 2019 - 07:18 PM.


#77 kaotch

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Posted 12 April 2019 - 09:30 AM

Thanks for the info . I do have a copy of Hardt's book and wil tryout several yellow formulae.



#78 Mike71

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Posted 08 August 2019 - 12:11 PM

Are there any storage issues with this comp... being extremely hygroscopi wirh sodium nitrate and magalum

#79 rellim

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Posted 21 August 2019 - 08:49 PM

Cryolite is cheap and nearly insoluble in water. I got a pound of it at a local ceramics supply shop for $4.50. I made some Hardt yellow 3 with it and it was incredibly bright. I didn't have any suitable Al so I substituted 16.2 MgAL for the 19 Al.

That should be 18/.85 = 22.4 MgAl.



#80 kaotch

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Posted 25 August 2019 - 09:40 AM

@relim

Replacing Al for MgAl, calculating on basis of Fuel Value 22,4 MgAl is correct.How did you arrive at this value using 18/.85= 22.4 ?






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