6" double petal

[Mumbles]

Alright, so I am missing some pictures that will have to be added at a later date, but I think I can still explain well enough. To save on loading speed, I'm also keeping all the pictures as links. There isn't anything that is completely neccesary to see while I am describing. I'll also show where additional pictures would be needed.

 

It should be obvious this isn't a beginners project. One should be very comfortable and competant with smaller shells. A shell of this size eats up chemicals like nothing. There is roughly 800g of comp in the outer petal, 100g in the inner petal, and 200-300g of burst. The whole thing weighed in around 1300g, 90g of 2FA was used to lift it.

 

 

The first step is to attach the time fuse. Cut 1 1/2" of 1/4" time fuse. This will give about 4 seconds of delay. I cut one end on an angle to help spread fire inside the shell. Drill a hole slightly under 1/4" into the bottom of the shell casing, I used 7/32". Slide the time fuse into this hole. Leave about 2/3" of an inch on the outside of the shell. Hot glue all around the outside and inside to seal from fire, and anchor the fuse.

http://www.apcforum.net/Mumbles/Pics/tmpABB-1.jpg

 

To passfire into the center of the shell, some use a straw filled with BP grains. I personally use quickmatch. It is tied off at the bottom with a clovehitch, and at the top with another clove hitch. This will bring the flame to the center of the shell. Tying it off holds the fuse in place, but also makes a small explosion as it burns through, which might help to burst more symmetrically. Try it out on your own if you don't believe me

http://www.apcforum.net/Mumbles/Pics/tmpABB-2.jpg

 

Fill each hemi with stars. These are 5/8" cut stars.

http://www.apcforum.net/Mumbles/Pics/tmpABB-3.jpg

 

Take a 3" shell, and drill a bunch of holes in it. One large 3/8" hole is put into the bottom of one of the hemis to accomodate the quickmatch. Generally I will make a thin casing by pasting a few layers over a 3" plastic shell. At the time of manufacture I was out, and all my paper shells decided to get up and walk away, so I used a plastic shell

 

PICTURE NEEDED

 

Take a piece of tissue paper, around 12x12 or so, and add some burst. The burst used is 6:1 KP on hulls. They should each be about half full. Place the hemis into the shell, and fill around to hold them in place. I press the hemis down, and press the burst into place a bit, to hold everything in place as I keep handling it. Fill the inner hemi with stars. These are 3/8". You should be able to remove the inner hemi and have the inprint hold.

http://www.apcforum.net/Mumbles/Pics/tmpABB-4.jpg

 

Fill the inner hemi with burst. Some use another layer of tissue paper here.

http://www.apcforum.net/Mumbles/Pics/tmpABB-5.jpg

 

Fold the tissue paper over. I used masking tape to keep all the paper together. You will notice that the amount of burst overflows over the edges. This is critical.

http://www.apcforum.net/Mumbles/Pics/tmpABB-6.jpg

 

You can see the over flow here better. THere is about a half an inch gap. This was a little large, as I will explain later Notice how most of the stars already stay in place. The top ones come out a bit.

http://www.apcforum.net/Mumbles/Pics/tmpABB-7.jpg

 

This is the high tech shell closure tool. Tap the shell over and over, spinning it to hit different places. Push down to try to close. Enough tapping and pressing should get the shell to close. This can take 15-20 minutes. The first time I tried this I ended up crushing some stars. I did it a bit too hard. The second time around I used less burst and replaced the stars

http://www.apcforum.net/Mumbles/Pics/tmpABB-9.jpg

 

Once you get it close, seal it with masking tape. I used a few vertical strips to hold it shut, and a piece of 2" masking tape around the seam to seal it from any moisture from pasting.

http://www.apcforum.net/Mumbles/Pics/tmpABB-8.jpg

http://www.apcforum.net/Mumbles/Pics/tmpABB-10.jpg

 

 

 

to be cont

[pudidotdk]

Looking nice so far.

If you want to make a smaller petal shell, is the inner shell just half the diameter of the outer shell? E.g. 2,5" inner shell for a 5" petal shell?

EDIT: Also what is the smallest petal shell you would recommend making?

[crazyboy25]

90g of 2FA was used to lift it.

took me 30 seconds to find.

[gods knight]

another question was the casing homemade?

[Pretty green flame]

another question was the casing homemade?

From the looks of it i'd say commercial.

[Mardec]

Mumbles, didn't you close the inner hemi's before closing the entire shell? Does it work this way?

 

I would think they aren't allined then and that they would not create a inner round pastil?

 

I have no experience with pestils so excuse my stupidity.

[ravaz]

Your workstation is a comparable to a pig sty and is a complete cluster fuck.

[Pretty green flame]

Your workstation is a comparable to a pig sty and is a complete cluster fuck.

Oh come now ravaz, this is called organized chaos

[Mumbles]

It has since been cleaned before I left for montana. I do know it was extremely messy, and rather of a safety hazard to work in. I actually hate working inside the house, and do everything I can outside.

 

Yes, the hemi is commercial, though kind of low quality.

 

As far as closing the internal hemi, no I didn't. Some do, some dont. Most of the ones I've seen actually be closed, or at least made before the outer petals are with rather large shells. Having to redo something that big would take considerable time, and especially agrevating when different bursts are used for different petals. With only 2 petals, especially when using something as perfectly round as plastic, there isn't really a reason to close them, at least in my opinion. It may be something that gives a bit of a better end result, but it is something to be adjusted later if needed.

[crazyboy25]

These are 5/8" cut stars.

*sigh*