On Apr 24, 4:00 pm, "Fireball" <hob...@[EMAIL PROTECTED]
> wrote:
> You can have that damned plastic.. I remember the stuff in the mid 80's
when
> the Chinese started building and stung me at the end of a finale.
>
> Just like shooting out of PVC.
>
> Doug
>
> "Mike Burge" <frontier_market...@[EMAIL PROTECTED]
> wrote in message
>
> news:dbce0f8f-e1de-47b9-99fb-2652cfb18452@[EMAIL PROTECTED]
> On Apr 23, 6:08 pm, "Fireball" <hob...@[EMAIL PROTECTED]
> wrote:
>
>
>
> > Confinement is im****tant in any explosion.
>
> > Weather German or Indian or American- Micron is what you should judge
on
> > the
> > explosive.
>
> > Great flash-1 teaspoon on a 2 x 4 should break the board(unconfined)
>
> > Concussion will be greater when confined.
>
> > That's why some of the older Btm shots concussion on smaller shells
are
> > greater than larger Chinese shells- due to confinement.
>
> > "Mike Burge" <frontier_market...@[EMAIL PROTECTED]
> wrote in message
>
>
>news:3b3a54af-b51c-403a-9baf-238dcdbd10e0@[EMAIL PROTECTED]
> > On Apr 19, 10:22 pm, j-t <mailjoet...@[EMAIL PROTECTED]
> wrote:
>
> > > Surely the word confinement has had plenty of heated discussions
when
> > > doing a search on the group with the word.. as far as spiking and
> > > pasting methods to obtain optimum re****ts ...I was just curious what
> > > this was all about..
> > > (quoted from a old post)
> > > ((You can get just as loud a
> > > bang from a potassium perchlorate/809 aluminum and sulfur or
antimony
> > > in a 8-3-1 or 4-1-1 mix as a 7/3 mix of potassium perchlorate and 10
> > > micron black flake aluminum. It is cheaper to use Potassium Chlorate
> > > in a 4-1-1 mix))
>
> > > I remember reading on a so called "dark flash" that was 50/50
chlorate/
> > > antimony
>
> > > I also remember reading about adding antimony to flash mixes to
> > > increase sensitivity.. but never tried it.. do to the numbers not
> > > adding up to me.. the dark flash I made when ignited under flame
> > > wasn't much of anything.. but I'm not worried about it.. doubt I
will
> > > ever use it.. another thing I was curious about as far as flash was
a
> > > comp I seen stating a Al and Barium Sulfate mix solely that was
> > > supposed to be very fast and make a great re****t.. maybe my mixing
> > > methods screening and what not?
>
> > > If someone could figure these numbers for me and match them to the
> > > actually composition.. it just seemed a bit confusing probably
because
> > > I didn't read it over 20 times.. but this is kind of a double post..
> > > this other part I was curious about is these salutes I made with a
> > > tube with an ID of 2 inches witch isn't to far off from a 3"
> > > designated spiral wrapped can correct? according to FF's paper
> > > products.. I currently have one salute and another that is 7:3
> > > 3micron.. and the one in my video is based on ****mizu
perchlorate/Al/S
> > > stating it's loudest re****t obtainable with such mix..
>
> > > My assembly is ok I'm hoping.. I probably need to do some horizontal
> > > spiking too I assume.. I basically spiked it bare vertical.. made a
> > > wrap spiked the gaps of previous and wrapped again.. my re****t was
> > > best I've had yet with any shell.. It seems I get more of a "boom"
> > > with that mix than 7:3 3 or 8mic ...currently I have shot the one
off
> > > in the video and I need to light the other which is 7:3 3mic I don't
> > > like to have salutes sitting around.. it's just vertically spiked
like
> > > the current.. but before I start another spiking it up and what
not..
> > > I wanted the opinion if there's room for more adequate confinement..
> > > to achieve a better re****t... basically a "boom" opposed to a
"crack"
> > > when I was doing experiments with 1.75 plastic cans.. the pitch of
the
> > > ****mizu mix was better than 7:3.. but in such can I used no more
than
> > > 5 grams.. some way less.. so maybe that played a roll... I guess
most
> > > of all I'll learn from experience.. I was just curious if I should
put
> > > more work into my shell...
>
> > > only time I get to set one off is out in the other property so I
> > > didn't want to waist my time or have three or more salutes sitting
> > > around waiting to be lit.. with different properties and
confinement..
> > > so most of all I'll see how the 7:3 does soon.. maybe yeild better
> > > than the ****mizu based stuff providing confinement is well enough..
>
> > > here are some photos I took during the
> > > assemblyhttp://www.villagephotos.com/pubbrowse.asp?folder_id=1986785
>
> > > and here is YT Vid..
>
> > which powder was used in the video? that sounded like a boom to me,
> > was that ****mizus mix? 70/30 should get you those results too, with
> > same type of construction as well as 70/30 whistle burst. Really
> > depends on the aluminum in smaller shells, you want the german dark.
> > Confinement should only be an issue with black powder. Your methods
> > look fine for any flash or whistle mix that were weighed and mixed
> > very well. I got red struvite clay in my mix once and it was reduced
> > to the speed of fffg black powder and needed a lot of confinement to
> > where I just got rid of it, luckily it wasnt a large batch.- Hide
quoted
> > text -
>
> > - Show quoted text -
>
> I agree, but it is not as big of an issue with really good flash as it
> is with less energetic comps like bp. If your flash is slow
> confinement will help (like chinese firecrackers and small shells),
> but if you have fast flash RAP shells should break quite well w/o
> having to try and confine it more.
Lloyd ,I know for a fact that 5grams will self contain,I had a batch
of 70/30 german black and chinese gourmet that ,I tested in a plastic
bottle cap , no wrapping .that detonated and left a 14" circle on my
lawn,I just notched the cap to hold the wick ,and thought it would go
poof!!ever since that day ,I static proof my whole work area and wear
heavy gloves when mixing flash
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