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Completely redesigned engine, preps for the new static test

Posted by priitserk in Building high power sugar rocket, 07 November 2019 -

· 7 views

After going through the calculations and previous test simulations then something was bothering me. I could not get the pressure under control. So after studying more my data I found out that my pressure and thrust curves were inverted and this is wrong.
After careful modelling this is the new data I am using for the new test:

As...

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Ball milling clumping

Posted by WillowPineAndBoom in WillowPineAndBoom's Blog, 21 August 2019 -

· 46 views

Hallo to all pyros again! i have a problem with the ball mill! when the metal starts to be fine it sticks to barrel and i don't have any further grinding efficient! Is anyone there that know what it could be? I don't have humidity here especially now at summer! please help guys because i become crazy with this thing! + the barrel is from pvc not rubber an...

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Rockets and Smartphones

Posted by nils in Nils' Sugar Rocketry, 15 April 2019 -

· 218 views

Once I wanted to record onboard video of my rocket flight. I had Sony Xperia Go smartphone which I didn't use anymore because it was outdated. It's video recording was still quite OK, so I decided to use it as video camera.
I was a beginner and for several reasons the flight failed. But I still got some video:
https://www.youtube....=xBHyO1XliFU...

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2 Comments

Homegrown Oxidizers

Posted by WSM in WSM's Blog, 07 May 2017 -

· 1,174 views

Homegrown Oxidizers Part Thirteen
WSM

As we continued our cell preparations by filling the titanium tubes spot-welded to our electrodes, we encountered a major setback. The thin-wall titanium tubing was seriously compromised by the spot welding process and leaked out some of the lead-free solder through the spot welds as we were trying to fill th...

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Large MDF Formers

Posted by marks265 in Pyro Musings for Thought, 04 February 2017 -

· 597 views

Large Case Formers!

Do you really want one? Well, if you do and don't have a big lathe maybe these ideas can help you. I had a smaller cheapy lathe that I bought from a big box store. They don't sell them anymore and I burned mine up trying to make a former that is larger than an 8 inch'er. I contemplated what to do about this and I came up with a...

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Small Fire Crackers that give a Big Bang

Posted by PyroRob in PyroRob's Blog, 09 January 2017 -

· 547 views

I am always trying to find a safe inexpensive ways to improve my fireworks. Last 4 th. of July I came up with nice replacement for fire cracker tubes which can also be used as reports in a mortar shell. I had ran out of tubes and forgot to order more in time for the 4th. I decided to run to Menards to get some hdpe pipe to...

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magnesium coating parlon

Posted by Askenaz in Askenaz's Blog, 14 October 2016 -

· 334 views

magnesium, coating, parlon and 1 more...

I read here that PARLON works well coated magnesium, I'm doing blue stars with ammonium perchlorate and have used magnesium coated with potassium dichromate, but I want to try PARLON, but still do not know if the procedure is the same Like with dichromate or change quantities, porfabor if someone knows how PARLON add a kilo of magnesium I would greatly ap...

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anyone knows how do nitrocellulose blue flame?

Posted by Askenaz in Askenaz's Blog, 09 October 2016 -

· 432 views

NITROCELLULOSE FLAME BLUE

In recent days I have treaty making based on nitrocellulose of blue llama, free (AP),

I have added copper oxide, copper sulfate, but no colour, if someone knows thank the contribution.

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7 Comments

Correct core dia formula

Posted by Redrocketman in Redrocketman's Blog, 20 June 2016 -

· 435 views

When casting a cored r candy motor, is there a basic formula to determine core diameter. I believe core should be 1/3rd of the I/D of the grain / motor? Correct?
So if I was to cast my regular weekend blazer ( simple 400mm X 45mm nozzle-less ) I can figure out core diameter no problem, but is the a maximum allowable limit to how far into the motor,...

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2 Comments

Intro to SCP things.

Posted by Arc in SCP, WW2., 14 April 2016 -

· 518 views

Informational

I will start this off with the basic things about the SCP Foundation, there are theres a good handfull of things to the SCP universe. SCP is supossebly a 'Fictional' orginazation of the paranormal and dangerous Anomolies. Some SCP's are interesting A LOT of them can easily kill a man, and some are just plain... creepy? o.o. I can give some examples on wha...

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Tailing bombettes and other items

Posted by spitfire in spitfire's Blog, 22 September 2014 -

· 1,114 views

What is a bombette in the first place? Simply a tube shot from a small mortar, like we see in commercial cakes linked together to shoot 12, 19, 30 shots one after one. Each shot tube contains a slightly smaller tube containing a clay plug holding the delay fuse, stars and flash burst. When they are fired we see a colored rising tail. Red, green, gold, gli...

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5 Comments

Booster charge or two stage charge for getting a shell into the air

Posted by JHCBlue in Boost Charge, 14 March 2014 -

· 964 views

Shell, booster, charge and 2 more...

I've been working off of a supply of real black powder and using the one ounce per pound formula for decent altitude. I'm going to run out of the real stuff soon, and am testing my black powder quality and production process to see what adjustments need to be made to get my shells into the air. One thought was to have a two stage boost, one to...

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6 Comments

3 lb rocket Ti tail , 4 inch cylinder , with glitter comets and reports

Posted by mkn in mkn's Blog, 04 March 2014 -

· 954 views

Hi all,
Here is a 3 lb rocket with Ti tail, the 4 " cylinder has 3/4 " glitter comets and timed reports( the timing was not great) I also put a bottom shot on that must have had a seal problem, because it burst during the shell burst( you can see it in slow motion view, and hear it in the video as almost a double burst.)

overall , home made t...

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My entry into pyro world begins

Posted by pyrodoc in pyrodoc's Blog, 28 February 2014 -

· 978 views

Hi,

As a beginner first batch of chemicals has arrived. I will keep updating the blog as and when things arrive and i make something.

1. Salt peter
2. Barium Nitrate
3. Strontium nitrate
4. Bentonite powder.

Now, waiting for Sulphur, Charcoal (airfloat and 80 mesh), Titanium powder, Acetone, Ethanol, Shellac.

Still, struggling...

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9 Comments

Beautiful day to cook some wood.

Posted by Bobosan in Bobosan's Blog, 28 March 2013 -

· 5,672 views

Looks like I'll try this blog thing out.

It was a gorgeous day so decided to cook some Paulownia using the old retort method with kettle grill and briquets. I wanted a fresh batch of external heat retort cooking of Paulownia charcoal for burn speed testing vs. Paulownia cooked with the TLUD method. TLUD will cook any size or shape of wood but maybe...

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5 Comments

The Bucket Cell - pH Meters and Probes

Posted by Swede in You'll put your eye out..., 03 October 2012 -

· 1,235 views

Very cool - a "Post to Blog" function. I thought I'd give it a try, since this post has some hopefully good information in it.

pH Probes and Meters for the (per)chlorate process

I spent far too much time on pH probes today. Again, the idea behind the simple bucket cell is so one doesn't have to mess with pH probes and meters, but I...

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1 Comments

Build Pics

Posted by psyco_1322 in psyco_1322's Experiments, 20 June 2012 -

· 1,539 views

Just making this to post some random build pics of stuff I've been working on. Some things are for competition, some are just tests, 4th of July stuff, and fun shootings. Feel free to comment and ask questions.

5" Ring and SOS
Posted Image

3" multibreaks...

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12 Comments

The Idea and the Plan

Posted by nater in Rocket Project from Start to Finish, 12 October 2011 -

· 664 views

One of the reasons I started building fireworks was because it is difficult to get a good commercial rocket. One of my old favorite consumer rockets was Phantom’s Blue Streak Rocket. If you don’t remember it, it had a charcoal tail and a hard broken header with blue stars and silver fish. Since then, this little rocket...

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4 Comments

Civil War Reenactment

Posted by nater in Pyrotechnician for a Season, 11 September 2011 -

· 507 views

I have not updated this in a while, I have still been shooting shows, but they were nothing out of the ordinary. The sky diving festival posed an interesting site hazard during the set-up with beginner jumpers landing near us, but other than that it was a typical show. (On a related note, if you're wondering what sport cute women participate in, take...

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0 Comments

Making 30 3" Paper Ball Shells in 3 Weeks

Posted by jwitt in Journey of a Rookie Shell Builder, 02 August 2010 -

· 750 views

paper ball shells

I'm writing this blog entry because I'd like to share my techniques and findings. I think it will be a nice introductory tutorial to those who are considering making paper ball shells.

Starting my second big shell building project got me thinking about efficiency. I wanted to get these shells built in the minimum time possible, while still being as...

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