Re: confinement flash -video

1 x 3 was actually 3/4 x 2 1/2 tubes (can star)
that is shot out of a 1" ID tube
just a correction

On Apr 26, 4:55 pm, j-t <mailjoet...@[EMAIL PROTECTED]
> wrote:
> I almost think I'm changing the subject but
> I'll go ahead and get a few things out of the
> ..as you seen if you watched the video.. it
> almost took a 5 second.. and was around
> apogee.. and I'm currently using visco in
> long lengths and not having a rolled kraft
> or w/e inside the fire wall to delay it.. but
> I'm curious of burn rate of the lengths like
> I'm using as it travels to apogee.. I use
> fresh visco since I just had it ****pped to me
> but could it possibly be burning faster as
> say the lift is more violent spinning the shell
> like hell with such a length of fuse and
> possibly cru****ng parts of the of the fuse
> when assembling making it burn faster in
> flight.. is it a high possibility that this could
> happen with such construction.. I have some
> time fuse ordered.. I'll be converting to that
> ..I've read and studied using it.. but I'll try
> it with less violent comps such as a little
> whistle comp or so.. plus I'm moving up
> to 3" and 4" spherical so with the 4"
> atleast I'll be using it.. don't want to destroy
> one of those and watch my work go to
> waste.. and may I add the question that. Is
> 3/8" stars still too big for a 4" or about right
> I use star plate for most of my star comps
> ..I'll stick with canisters for now until I receive
> all my material.. another question I had was..
> I've been building shells out of 1 by 3 tubes
> gluing inserts and I use a pinch of 4fg and
> a half gram of slow flash.. and they work
> beautifully.. but the question is.. if I decide
> to use these for the 4th should I be looking
> for inconsistencies of the shells and what
> 1/4 inch stars I'll be using with the Al being
> in there.. these are tossed together loose..
>
> thanks for all the info.. I hope I've addressed
> some on topic issues.. I'm just trying to be
> safe.. and not rush into things.. I get the
> "the only stupid question is the on you dont
> ask" so there I go.. appreciate your time..
> my grammer and writing skills are rather
> poor so sorry for any jumping around in
> paragraphs and making the gist of the post
> confusing.. which I've done before but a
> good pyro got the gist of it even though it
> was hard to follow (he said so).. thanks..
>
> 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.