34 replies to this topic

[Rhodri]

Thanks for augmenting my post Alany - very interesting stuff there!

In summary, don't use chlorate / gallic acid and drink more tea!

Seriously though, I find whistles very intruging and would like to experiment more.

HOWEVER! The idea of a chlorate, let alone pressing such mixutres, does worry me.

I'm quite resigned to the fact that these devices are out of my league and best left to the professionals.

Still, I shall continue to buy them and enjoy their amazing properties!

Edited by Rhodri, 31 January 2004 - 03:11 PM.

[alany]

Seriously though, I find whistles very intruging and would like to experiment more.

One thing that has intrigued me for a while is the idea of using whistles as spoulettes, or as spin motors in flying fireworks, like that 1.4G device that has two whistles for spin and a BP driver for lift. Whistle rockets are neat too, but real attention getters if you are trying to avoid that.

I once saw a 1.4G fountian, titanium layers and red microstars, but is also had several whistles. I am not sure how they were matched off the fountian, I can't imagine they'd be inserts in a 3/4" fountian? I've also seen whistling tourbillion inserts, especially in cakes, I'd like to know how they are constructed. They typically have silver sparks, which I assume is titanium or barium nitrate/aluminium. Is the whistle just attached or is it the thing spinning the insert and spewing out the sparks? How would you vector the thrust of a whistle without blowing it up?

I'm quite resigned to the fact that these devises are out of my league and best left to the professionals.

A simple arbor press made from timber could easily press a bottle rocket sized whistle motor. I've got to do more experiments in this area myself, I have a 12 ton press so I may as well do it.

[Yugen-biki]

I saw a picture from an old pyro book where they used a flute or dog whistle like pipe with some gas produseing comp. packed in it. There was also a pick of a flute on a rocket. The air flow when the rocket flew generated a whistle. This might be something for the pyro who lacks The chemicals needed.

Edited by Yugen-biki, 02 February 2004 - 01:03 PM.

[Rhodri]

Hey! What a great and simple idea. I'll hunt around for some whistles.

Maybe if one were to use a sugar variety it would provide the fuel.....only joking!

Thanks for a good suggestion.

[Yugen-biki]

Thanks!

I don?t think the tone will be so loud using a whistle, but i?t sure aint friction sensitive!

[Rhodri]

Too right!

[Yugen-biki]

I made some Na-Benzoate and K-Perklorate whistle to day. The sound was not as loud as I would have guessed. But hey it worked. I foud out that Na-Benzoate is used as a preservative for food. And yes I found a 20g bag in the store. It was expensive but fun! By the way it?s not as friction sensitive as other whistler are, and it?s a plus. I have a nice movie of it if someone would like to share some web space for it. Iwill try it in shells for bursting some time in the future. I`ll let you know.



I was thinking.... Reading Lancaster I found that Titanium was used as a silver tail in whistle rockets using the whistle above. But the Ti made it more sensitive. I then remembered Shimizu?s "comet" using perc and Al. This would make some very nice tails, I have heard. And the conclution: Is it possible to add Al atomized instead of Ti in the benzoat perc whistle? Maby compensating a little by adding some perc. Is the Al going to make it friction and shock sensitive? I can`t see why it should. But better safe then sorry! Maby I`ll test this next week.

Edited by Yugen-biki, 23 April 2004 - 08:07 PM.

[alany]

Was it just 7/3 whistle or did you add the iron oxide and petroleum jelly?

Also, what diameter tube did you use and what size core? Whistles are louder when pressed very dense, using a large diameter tube and a core, you also have to have the slack space above the composition to get them to whistle at all.

I did some whistle experiments today, all about nozzled whistles and learning how far I can push my luck with them. I want to use whistle as a z-charge/flying hummer propellant and for tourbillion inserts.

In my experence spherical Al in whistle is pretty boring. I'll make one in a minute and shoot some video of it for you. Ti flake is excellent and a small amount goes a long way (3% or less is great), but more dangerous than spherical Ti which works almost as well. Something I've been working on is little cone fountians of pressed whistle with glitter microstars, the result is spectacular, cheap and available to anyone with KP, spherical Al and bicarb soda.

Edit: take a squiz at this video, 10% spherical Al + benzoate whistle:

http://nexus.cable.n...rical-Al-01.avi

Edited by alany, 24 April 2004 - 10:48 AM.

[Yugen-biki]

I used no Fe3oxide or jelly. I used 30% Na-benzoate & 70%K-perc. The tube was pressed with 4cm (1,6inches) whistle and a clay plugg in the bottom. I left about 3cm tube untill full and no spindle. Just a flat surface. The tube diameter was 14mm and it lasted 6 sec.

Nice video!

[alany]

Actually I thought it was a pretty bad video, the smoke, reflections and saturation of the camera making it difficult to see the effect. But it does show that spherical Al in whistle isn't all that fantastic, some sparks, still whistles, etc.

I'll do a titanium one tonight and post that too. These are really small devices, 5 mm ID, 25 mm long, half charged with whistle + 10% metal, small 5 mm deep 2 mm ID core. So they don't burn very long or very loud. The whistle composition is described here:

http://www.vk2zay.ne...ition.php?id=26

[Yugen-biki]

I?m adding some Al to my whistle to day. I?ll record it to see the differense with the one without AL.

The video wasn`t that bad. Or the fountain wasn`t.

[Demented Ferret]

About the synthetic whistles (non chemical):


http://www.sillyjoke...st-whistle.html ?

[Yugen-biki]

I have tested a similar "flute" and it didn`t work. A week whistle was heard outside the car at a special rpm.

I?m testing a benzoat whistle today soon with 10% atomized 80micro Al pressed at 3,75 metric tons.


Later today:
It didn`t work at all. A yellow fountain was the result. No sparks and no sound. A nozzle/spindle is the next step. And no Al!

Edited by Yugen-biki, 25 April 2004 - 05:30 PM.

[Ritual33]

Could somebody help me source a good solvent? for mixing whistle mix. I hear Toluene is nasty stuff so I'm staying well clear.

What else can I use to disolve petroleum jelly?

Regards,
Drew

[karlfoxman]

I believe Acetone will desolve it, as will paint thinners. Ive used paint thinners before with good results.