My new 6Kg firework with 8" double petalled shell.

[MinamotoKobayashi]

Hello dudes.

During these very sad days, while I'm locked into house since 45 days (yes, 45 days, and it's not over yet), I have the time to do many things,

such as to clean well the house and to build fireworks for better days.

This time I built a 8" double petalled shell with Kleberrio's willow stars and Winokur 39J stars.

 

Putting the first layer of Kleberrio's very fine ballmilled willow stars (raspberry shape LOL):

 

Inserting a generous amount of dragon eggs between the free spaces:

 

Interting the second layer of Winokur 39J stars:

 

Putting some coated rice hulls between the free spaces to assure a correct ignition of all the stars:

 

Inserting a bag of tissue paper full of coated rice hulls:

 

Closing the hemis with some stripes of 30mm gummed paper. The paper was wetted only in the extremities:

 

Closing and arranging the two hemises in the best way with the help of a rubber hammer:

 

Removing the useless stripes ungluing and gently slipping them:

 

Applying a 30mm gummed paper following the NeighborJ procedure:

 

Since I repeated twice the pasting procedure to obtain an hard break, I have rotated the starting point of 90 degrees from the first starting layer point

to obtain a more homogeneous grid. I used a small neodimium magnet over the hole to easily find it after applied the second layer.

Finding the neodimium magnet using another neodimium magnet. Removing the magnet using a small sharp cutter:

 

Making a small hole into the delay part (varying the hole depth will vary the altitude ignition).

Inserting a perchlorate superfast Visco fuse into the hole and filling the top part with hot glue to keep everything in place:

 

Inserting and perfectly gluing the shell to the massive cardbard adapters with Titebond glue. Leaving the parts under pressure for about 24 hours:

 

Gluing three heavy 1250mm samba sticks to the rocket with hot glue:

 

To avoid the dangerous scenary where one of the sticks can detach from the rocket I locked the three sticks with some turns of 50mm gummed tape:

 

Attached 20 grams of autoadhesive weights to the end of each stick to perfectly counterbalance the heavy firework:

 

Inserting a long piece of superfast perchlorate Visco fuse inside the long conic hole joined to a strong 15mm delay fuse:

 

The awesome rocket placed together all the other rockets on hold to be launched:

 

Well, my little arsenal is ready to celebrate the ending of ours illegal and exaggerated house

arrest.

Sometimes I dream to launch all those beasts against our silly, hired, corrupted and

unpreparated italian politicians, but then I thinked it would be a big waste

Stay tuned my friends, soon will come the day that I will launch them all !!!

 

Richard.

Edited April 15, 2020 by MinamotoKobayashi

[SeaMonkey]

Amazing photos! Superb workmanship!

 

Can hardly wait to see them in the sky.

[memo]

beautiful shell and rocket. hope to see the video soon.

[dlking59]

That is some outstanding work. They really look nice.

[Bigmark]

Very nice build.

[ExplosiveCoek]

Very nice build and detailled explanation!

 

Is there a reason why you use the extra weight on the end instead of longer/bigger sticks?

[MinamotoKobayashi]

Yes, I have a big batch of 1250mm sticks to use LOL

Besides this, I have difficult to insert longer sticks inside my rocket launcher .. I risk to break the sticks while I try to put them inside.

Another solution is to use more sticks.

Edited April 18, 2020 by MinamotoKobayashi

[Arthur]

I've seen old books with suggestions of having a small fin set at the tail of an under size stick, Has anyone else done any reliable literature search or research?

 

These, from the old drawings, were like darts flights just larger, The issue can be getting them into the launcher.

[MinamotoKobayashi]

Mmm interesting, but I suppose that the little fins are useful to avoid the twisting issue of the whole rocket, especially in the initial fase where the thrust is higher (in the nozzleless rockets of course).

The baricenter must be always under the shell joint. Futher is the baricenter, better will be the counterbalance.

And yes, the tube launcher diameter could be the major issue.

[Dylman]

Minamota that's some amazing workmanship by the looks of things I'm guessing you wrap your shells with a machine. How big are the rockets that are lifting those huge shells? I can't wait till the day when I can produce such a beautiful shell & rocket. Truly amazing. I'd love to see if you notice any performance difference in ur raspberried stars. Thanks for all the documentation.

[MinamotoKobayashi]

Hi Dylman.

Nope, I had pasted the shell by hand with a lot of patience and some nice tricks.

The construction of the rocket that will lift this 8" shell is well explained here:

 

https://www.amateurpyro.com/forums/topic/13373-my-new-1kg-nozzleless-hybrid-propellant-aluminum-tube-rocket/

 

and this is the launch of a similar project some months ago:

 

https://www.youtube.com/watch?v=nmhfq5n2WRk

 

I'm just ended my first heavy 7KG 10" shell with three layers of stars.

It will be lifted with the help of three rockets.

Now I'm out of some chems, but as soon as I receive them I will end the project and make a new threads how I realized it!

[ExplosiveCoek]

I'll be in Italy soon, wait for me to launch them please hahah!

[Zmuro]

Nothing more to say than just bravooo, I love your attention to detail and craftsmanship. I bet this rockets will be fun to watch