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Speed balls/Zippers/Zips


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#21 NeighborJ

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Posted 27 July 2016 - 08:28 PM

I've never had one pop after making them nozzleless but I did learn that the header needed to be at least 1/2 dia thick or it will sort of fall apart and only spin. And I also drilled the hole after it was pressed so I never used any metal. I will need to predrill in the future so I can.

#22 dagabu

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Posted 27 July 2016 - 08:43 PM

Nozzleless! Why didn't I think of that!?!

 

Great idea, J!  Thanks for that before I go off pressing a bunch tomorrow.    :D


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#23 AzoMittle

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Posted 28 July 2016 - 12:35 AM

Does this look correct? I drew it at 1:1 scale. http://i.imgur.com/blwjCCe.jpg

 

The forum is not letting post the picture directly to the thread, it says that the image extension is not allowed.


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#24 NeighborJ

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Posted 29 July 2016 - 03:49 PM

I have attempted to add a half hemi full of dragon eggs to one of these zippers but it ended in a Cato.
I had made a spolette and pressed the header around it. Unfortunately in doing so the fuel grain cracked precisely where the spinner nozzle was located.
I won't let this defeat me, I have plans to use green visco to passfire from the spinner nozzle to the 1/2 hemi.

#25 dynomike1

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Posted 07 August 2016 - 08:28 AM

Will 325 atomized aluminum work? I have that on hand.


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#26 dagabu

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Posted 14 August 2016 - 01:56 PM

I launched all of my #3 Zipps and only one CATOed, the nozzle was small and confined slightly.  The remainder worked fine but the hole enlarged significantly and slowed the spin. I am thinking of pressing a clay "ring" for the nozzle to form above the spindle tip then lay in the delay.  


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#27 NeighborJ

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Posted 15 August 2016 - 10:21 PM

I've finally managed to make a whistle powered zipper. I had hoped that the sound would be something unusual but in the end it sounded like a normal whistle and proved to be quite dangerous. They spinnup so quick that they don't turn strait up, then when they burn into the core they shoot off at light speed at a slanted angle. I don't think I will be trying this again.😬

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#28 Mixer

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Posted 15 August 2016 - 11:23 PM

I've finally managed to make a whistle powered zipper. I had hoped that the sound would be something unusual but in the end it sounded like a normal whistle and proved to be quite dangerous. They spinnup so quick that they don't turn strait up, then when they burn into the core they shoot off at light speed at a slanted angle. I don't think I will be trying this again.

If you want proper performance, it`s imperative that you follow the specifications in the Zipper tutorial.  If you deviate from this you could get something that performs very differently. They are small for a reason.



#29 NeighborJ

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Posted 16 August 2016 - 05:53 AM

I've made dozens of your design and they work good. But I eventually got bored so I started making them in all sizes then I started making them nozzleless which turned out to be almost foolproof. Honestly I'm not sure how you could get one of these things to screw up short of Cato once the nozzle is gone. So this has been a project I pick up once and awhile to try something different. I'm not confined to strict adherence to the original design. With each modification comes new and exciting hurtles to cross and I've rather enjoyed the journey.

#30 Mixer

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Posted 16 August 2016 - 09:01 AM

Oh ok,I see now after careful reading.



#31 dagabu

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Posted 16 August 2016 - 03:15 PM

Here is a 3 pound Zipper shot last week, no heading, just a test.  

 


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#32 OldMarine

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Posted 16 August 2016 - 03:25 PM

Yup, gotta get back to working on those! How long was the tube?


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

#33 dagabu

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Posted 16 August 2016 - 09:00 PM

They were 1" ID and about 5" long, whatever I had sitting in the tube bucket for end cuts.  Even a 4" long one would work. 


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#34 NeighborJ

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Posted 23 October 2018 - 09:00 AM


These things are sure fun, even without a salute or header.




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