Slinging.org Forum - Aerophonic projectiles

Hondero

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Re: Aerophonic projectiles
Reply #15 - Mar 25^th, 2011 at 1:31pm

Jlasud, very nice that you collaborate in the project. I hope that all together cheer up ones to others to continue working in the subject. Some weeks ago I tested a prototype very similar to yours, with two sharp holes near the point and a shape a little more elongated. It sounded very well when I blew the point, but when throwing it had many problems of stability and hardly it made a brief and weak noise. There are not any problems to stabilize point-first a solid bipointed projectil but a hollow one is very problematic. Don´t know if you have solved this problem yet in your prototype and it can fly without wobblings. I´m going to fill the central part of mine with clay and to get so a better distribution of weights, thought the cavity will be divided in two parts. Another possibility is to increase the thickness of the walls of the central part.

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« Last Edit: Mar 25^th, 2011 at 5:24pm by Hondero »

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wanderer

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Re: Aerophonic projectiles
Reply #16 - Mar 25^th, 2011 at 1:31pm

Jaegoor wrote on Mar 25^th, 2011 at 1:15pm:

Wanderer, it can be a groove, or just a hole.
If one pulls small strings by the hole, these generate in the flight a deep tone.
It is also to be connected possibly several Glandes in this manner with each other.
An actual weapon against riders.

I'm still having some trouble visualising this.

Are the strings attached only at one end?

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Jaegoor Interfector Viris Spurii Offline Slinging Rocks! Posts: 1074 Gender:	Re: Aerophonic projectiles Reply #17 - Mar 25^th, 2011 at 1:41pm If one wanted it as a weapon one connects two Glandes with each other. If one wanted only one sound, one pulls the strings only by the hole.
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Hondero Senior Member Offline Posts: 463 Madrid-SPAIN Gender:	Re: Aerophonic projectiles Reply #18 - Mar 25^th, 2011 at 1:47pm Jaegoor, interesting your proposal. I had already thought about fixing a reed on a glans to test if it vibrates and makes sound. This weekend I´ll test your solution.
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jlasud

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Re: Aerophonic projectiles
Reply #19 - Mar 25^th, 2011 at 2:23pm

The best aerophonic projectile that left my sling was fired ceramic,and look similar to what I draw.It flew about 140m and hit a tree and smashed.It had a quite whistling sound it just was deeper,and could be heard no problem until it broke.The next thing I'll test is the same design but smaller interior cavity so maybe it resonates faster,as the airflow within accelerates in the small chamber.And don't worry about too much work being wasted,I made the mentioned projectile in 15min so it's no big deal,think about an arrow that would probably need 2h+ if you make A-Z the arrow. I have a bag of clay within arms reach,and start making some prototypes tonight.

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Yurek

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Re: Aerophonic projectiles
Reply #20 - Mar 25^th, 2011 at 2:52pm

Though I usually don't like noisy ammo due to the air drag but special whizzing projectiles can be a fun. Last time I have been slinging snowballs mostly. It happened that I grabbed snow and some grass together to stick the ball. The protruded blades could generate really interesting sounds in fly.

When I was a kid there was known a game with whizzing blade of grass. It was stretched between the thumbs and when was blew by the mouth it squealed loudly. I believe that children around all the world know that game.

It brigs me to an idea of a 'noisy' missile for sling. I will try to picture it.

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jlasud Interfector Viris Spurii Offline Programming stones Posts: 1686 Transilvania Gender:	Re: Aerophonic projectiles Reply #21 - Mar 25^th, 2011 at 4:37pm Finished 3 clay projectiles,their drying now,one has holes adjusted for the clockwise rifle spin.I'll post my experiences if their worthy.It's good this topic was started,I kind of forgot about this project.
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Masiakasaurus

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Re: Aerophonic projectiles
Reply #22 - Mar 25^th, 2011 at 6:42pm

wanderer wrote on Mar 25^th, 2011 at 1:31pm:

Jaegoor wrote on Mar 25^th, 2011 at 1:15pm:

Wanderer, it can be a groove, or just a hole.
If one pulls small strings by the hole, these generate in the flight a deep tone.
It is also to be connected possibly several Glandes in this manner with each other.
An actual weapon against riders.

I'm still having some trouble visualising this.

Are the strings attached only at one end?

Yes, and they vibrate like the reed of a saxophone.

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paracordslinger Senior Member Offline Modern society makes me want to shoot everyone Posts: 439 kansas Gender:	Re: Aerophonic projectiles Reply #23 - Mar 25^th, 2011 at 7:40pm i found that discarded shell casings sound like a siren when slung, and i can shoot about 10 22 shells in one go
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Yurek

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Re: Aerophonic projectiles
Reply #24 - Mar 26^th, 2011 at 6:38am

Yurek wrote on Mar 25^th, 2011 at 2:52pm:

Though I usually don't like noisy ammo due to the air drag but special whizzing projectiles can be a fun. Last time I have been slinging snowballs mostly. It happened that I grabbed snow and some grass together to stick the ball. The protruded blades could generate really interesting sounds in fly.

When I was a kid there was known a game with whizzing blade of grass. It was stretched between the thumbs and when was blew by the mouth it squealed loudly. I believe that children around all the world know that game.

It brigs me to an idea of a 'noisy' missile for sling. I will try to picture it.

Here is the picture:

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whizzing-glanda.gif (Attachment deleted)

In the shape, structure and position of each stone, there is recorded a small piece of history. So, slinging them, we add a bit of our history to them.

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kuggur slingdog

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Re: Aerophonic projectiles
Reply #25 - Mar 26^th, 2011 at 8:20am

jlasud wrote on Mar 25^th, 2011 at 3:02am:

I'm also very interested in the topic,and made a dozen of prototypes without getting exactly what I wanted ,but once I was quite close,and I'm willing to test and contribute,cooperate.I've been experimenting in the type 1 and wish to continue on the same path as I started to get close to a result.DM :some glandes form holes in them due to shrinkage of lead while solidifying,due to overheated lead or quite cold mold,not sure which.This occurs where the pouring channel is located.Obviously some glandes have holes drilled in them,probably for whistling.This is the design which kind of worked,but need to be tuned,interior cavity dimension and holes diameter ratio adjusted,too make a high pitched whistling,it's basically the same as whistling arrows,just bipointed form.The edge of the holes must be sharp and precisely made to create vibration.Ceramic and lead could be used to manufacture.

What if you placed the "air intake hole" with the fipple so that it would use the rotary speed (spin)of the projectile, instead of the forward speed. Maybe it would be good to open the cavity at the trailing end of the whistling gland (exit for the air).

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Dan

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Re: Aerophonic projectiles
Reply #26 - Mar 26^th, 2011 at 9:09am

paracordslinger wrote on Mar 25^th, 2011 at 7:40pm:

i found that discarded shell casings sound like a siren when slung, and i can shoot about 10 22 shells in one go

Yeah thats a great idea man. I have used them before as whistles and all you have to do is blow across the top, it works with almost any shell but 22 is the most shrill.

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jlasud

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Re: Aerophonic projectiles
Reply #27 - Mar 26^th, 2011 at 11:11am

This topic started some mindstorms here and there Wink

Kuggur Slingdog,interesting idea,the only brawback I see,is that rotation slows down much sooner than the forward motion,and putting holes would slow the spin down very quickly so the whistling would stop quickly,while the projectile still flying.I stick to the front hole version as this can be made to work surely,the opening on the back seems to me a working idea,whistling arrowheads don't have such but still work so,I will make a prototype of that too.Yurek,serious design you come up with,theoretically it should work,I'm interested of the results if you decide to make this quite precisely engineered design.

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curious_aardvark

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Re: Aerophonic projectiles
Reply #28 - Mar 26^th, 2011 at 2:16pm

Quote:

When I was a kid there was known a game with whizzing blade of grass. It was stretched between the thumbs and when was blew by the mouth it squealed loudly. I believe that children around all the world know that game.

I do that

Quote:

This topic started some mindstorms here and there Wink Kuggur Slingdog,interesting idea,the only brawback I see,is that rotation slows down much sooner than the forward motion,and putting holes would slow the spin down very quickly so the whistling would stop quickly,while the projectile still flying.

Nope. You are drastically underestimating both the sheer speed of spin a sling puts on an object and the fact that it continues to spin very fast after the forward motion has ended.
Drill your holes correctly and the 'exhaust' would add to the spin and help push the projectile forwards - kind of like a mini jet engine..

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Hondero

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Re: Aerophonic projectiles
Reply #29 - Mar 26^th, 2011 at 5:37pm

Eventually (by the moment

) I´ve selected a projectil shape type 2 that works better than the initial rectangular one, in spite of making a little less sound, but with better reach and trajectory. I´ve called it "flat glans" and is very promising, but i´ve to test differents weights, edges and dimension ratios. Have a look of it:

http://www.youtube.com/watch?v=m1TiC7r9Lck

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