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Zips/Speedballs/Zippers


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#1 Mixer

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Posted 09 June 2016 - 02:56 AM

If anyone is interested in making these I have a Tutorial I could dig out.

 

 

https://www.youtube....h?v=utqnO1DBFyk

 

https://www.youtube....h?v=7mikXso4T_g

 

https://www.youtube....h?v=N38GI7Bm3f0


Edited by Mixer, 09 June 2016 - 03:06 AM.

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#2 ddewees

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Posted 09 June 2016 - 04:17 AM

I'd rather see a video of your devices...
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#3 lloyd

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Posted 09 June 2016 - 06:00 AM

I taught a class on making them at one FPAG Fall Festival.  The very next day, there were folks making and shooting versions as large as 1.5" i.d.... and just about all of them worked!

 

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#4 ddewees

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Posted 09 June 2016 - 06:14 AM

I'd love to see videos... never seen a homemade one before.

I love those things.

#5 Merlin

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Posted 09 June 2016 - 07:09 AM

I would love a tutorial on those!

#6 lloyd

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Posted 09 June 2016 - 07:27 AM

I'll see if I still have a copy of my class handout.

 

L


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#7 memo

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Posted 09 June 2016 - 07:40 AM

that would be great Lloyd if you can find it and post it, I am interested also.

 

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#8 lloyd

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Posted 09 June 2016 - 07:55 AM

nah... not on this computer, anyway.

 

They're REALLY simple to make.

 

Just picture a spin-stabilized rocket, but with the spin hole at the end OPPOSITE from the thrust nozzle, and with the thrust core not extending the full length.

 

They're fused in the spin hole.  When lit, the thing first spins (like a ground bloom).  When the fire reaches the tip of the core, it then continues to spin and also thrusts out the other end.

 

However the precession forces interact, they nearly always then erect themselves thrust nozzle down, and up the go spinning fast enough to make the singing tone as they go.

 

Cute changes include using different colors or powder types for the spinup and thrust portions of the core.

 

So basically, you just ram a small nozzled rocket with a core that doesn't reach quite to the top of the fuel grain.  Use a slow enough powder so that it can be BOTH cored AND nozzled.  Press and clay-cap just as you would any normal nozzled rocket.

 

Then drill the tangential spin hole as close to 'just under the clay' as you can at the top end of the tube.

 

LLoyd

 

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#9 Mixer

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Posted 09 June 2016 - 08:26 AM

I`ll post it in the `Member Tutorials` section in a few minutes.



#10 FlaMtnBkr

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Posted 10 June 2016 - 09:10 AM

Is the fuse hole tangential or radial?

#11 Mixer

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Posted 10 June 2016 - 09:18 AM

See Lloyds last sentence.



#12 FlaMtnBkr

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Posted 14 June 2016 - 04:44 PM

I see that. And I thought it was supposed to be radial which is why I asked. Like a ground bloom flower. With it tangential it is essentially a spin stabilized rocket.

#13 ddewees

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Posted 14 June 2016 - 05:13 PM

I just want a video... :(
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#14 FlaMtnBkr

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Posted 14 June 2016 - 06:40 PM

There are quite a few videos on YouTube of commercial versions. Many with little kids lighting them and not great video quality.

I would post a link but I'm about to break my phone because it keeps messing up so going to stop while I'm ahead. Just search for one of the above names along with 'fireworks'.

#15 FlaMtnBkr

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Posted 14 June 2016 - 06:44 PM

Oh, and from the videos the fusing hole does look radial. I think I would use a slow comp above the core to try and extend the ground spin time.

#16 OldMarine

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Posted 14 June 2016 - 07:27 PM

Dan, Caleb has video on his youtube channel  of some he made.


Edited by OldMarine, 14 June 2016 - 07:28 PM.

Come on! Name one other hobby in which you cheer as your money and hard work go up in smoke!

#17 Mixer

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Posted 15 June 2016 - 01:27 AM

I posted three video`s!

 

Trust me - if you follow exactly the tutorial directions without deviation, the end product will be as you see in the vids.

 

I have seen many attempts fail dismally when the method and specs have been changed.



#18 dagabu

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Posted 15 June 2016 - 09:01 AM

I have seen similar items with a small report at the end, how is that accomplished? 


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#19 FlaMtnBkr

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Posted 15 June 2016 - 11:53 AM

Those slow motion vids almost look like they are spinning about their long axis like a spin stabilized rocket. They spin so fast that they almost have to correctly orient themselves because that introduces the least inertial, air, and friction resistance. And things like to orient in a way where the least resistance acts on them.

But what Lloyd describes is a spinning about it's short axis like a ground bloom flower. I have in my notes from almost ten years ago that he said the fuse hole is drilled radially. And it spins like a ground bloom and as the fuel is consumed and the center of gravity changes it erects itself like Viagra was crushed and added to the BP. Ok, kidding, but he used a technical term I don't exactly remember. Gyroscopic progression?

Anyways, the ones in videos are neat but they fly off too quick for my tastes. Lloyd's version sounds more appealing to me. Though as he pointed out they may not always go where you want them if they aren't completely erect when time to perform. Sorry, it's just too easy not to.

#20 BlueComet24

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Posted 15 June 2016 - 11:15 PM

I once tried to make a large ground bloom flower using a 25.4x63.5mm (1x2.5") tube with 2.4mm (3/32") walls. I rammed a clay plug into the bottom, drilled a tangential fuse hole/nozzle just above the clay, fused it, and filled it up with sorbitol rocket candy catalyzed by about 1% Fe2O3.

Expecting it to spin all over the ground like a souped up ground bloom, I put it on a large, flat surface, lit it, and ran. It spun like a ground bloom for a second, then righted itself and took off vertically, reaching an apex of about 10m! I was very surprised that it flew, and especially so well. Its only nozzle was the tangential one.






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