Slinging.org Forum - Wartilykirri

thabaill

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Wartilykirri - Number 7 boomerang
Aug 10^th, 2023 at 1:15pm

Hi. I am sure you will like these videos. If you haven't seen them already.

https://youtu.be/tTjulvwUFMI

https://www.nfsa.gov.au/collection/curated/karli-jalangu-boomerang-today-embers

https://aso.gov.au/titles/documentaries/karli-jalangu-boomerang-today/clip1/

I would like to build one. But for me the easiest part is finding a suitable tree. I have been watching everything I have found about this type of boomerang. But I still have serious doubts about the cross section shape, as I haven't seen one directly. I cannot see it clear in photos, even in high quality ones it is extremely dififcult. I only can see somewhat like a lenticular cross section with the lower side flatter. I am wrong for sure but it is what I can see from dozens or even hundreds of pics.

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joe_meadmaker Slinging.org Administrator Offline Slinging Ice is Cool! Posts: 3127 PA, USA	Re: Wartilykirri - Number 7 boomerang Reply #1 - Aug 10^th, 2023 at 10:40pm I like that design. Throwsticks has one like that. A handmade wooden one would be very cool though! https://www.throwsticks.com/wirlki https://www.youtube.com/watch?v=yusVFoYo3MM The one from Throwsticks is like you describe. The bottom side is flat, and the top side is rounded.
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Eino

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Re: Wartilykirri - Number 7 boomerang
Reply #2 - Aug 11^th, 2023 at 8:02am

joe_meadmaker wrote on Aug 10^th, 2023 at 10:40pm:

The bottom side is flat, and the top side is rounded.

http://hyperphysics.phy-astr.gsu.edu/hbase/brng.html

This site shows the cross section of a boomerang. It isn't shown on one with the shape you are looking at specifically, but it should still apply to it to some degree.

There are probably also videos explaining it on youtube.

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Once, Toivo and Eino were out hunting, and before setting out, Toivo told Eino to fire three shots in the air if he got lost, and Toivo would find him. Soon enough, Eino got lost, aimed his weapon up and prayed: "God, please let Toivo see my arrows!"

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thabaill

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Re: Wartilykirri - Number 7 boomerang
Reply #3 - Aug 12^th, 2023 at 8:22am

Hi. Thanks both for your replies. I have seen Throwsticks karlies and they look amazing. Also he shows videos of them being thrown and they reach amazing distances.

But in photos of aboriginal examples I think they aren't completely flat at the bottom.

I have made typical returning boomerangs and they are very easy to make in order they will come back. Actually the difficult task is to make one which flies straight.

I am afraid if I make a wartilykirri/wirlki or a karli with the common plane wing shape as in returning boomerangs, it will be actually a returning boomerang type but with an odd shape. I have seen that a boomerang with almost any shaped, not the typical banana or open V, use to come back if they have a flat under side and a rounded upper side. I really don't want such a weapon that can kill a huge male red kangaroo coming back!!! Grin

.

Actually as throwing sticks are cast horizontally what I think it will happens is what happens with returning boomerangs when you throw it horizontally: They fly low and suddenly they rise towards the right and fall violently hitting the floor and they usually break.

In the first video I posted, the engineer says that the handle tip has a negative angle of attack, the long arm has a plane wing shape, with a rounded top and a flat bottom (the section he copied to place in the wind tunnel) and the zone in the center of mass has a neutral angle of attack. But I really understand nothing! Grin

https://youtu.be/tTjulvwUFMI?t=817

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TOMBELAINE

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Re: Wartilykirri - Number 7 boomerang
Reply #4 - Aug 17^th, 2023 at 7:07am

The short blade is more steamlined ; it increases the range but curves the flight. The long blade is less streamlined ; it decreases the range but gives a straighter flight. This is the general design of this type of throwsticks.

Each stick is produced individually, the angles of attack of the long blade and of the short blade must be adjusted. A positive angle increases the rise and vice versa.

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« Last Edit: Aug 17^th, 2023 at 9:13am by TOMBELAINE »

1_023.jpg (60 KB | 50 )

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slingbadger Interfector Viris Spurii Offline Don't Badger a Badger Posts: 3229 Akron NY Gender:	Re: Wartilykirri - Number 7 boomerang Reply #5 - Aug 18^th, 2023 at 5:34am It's amazing how sophisticated "primative" weapons can be.
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TOMBELAINE Funditor Offline Slinging Rocks! Posts: 791 france Gender:	Re: Wartilykirri - Number 7 boomerang Reply #6 - Aug 18^th, 2023 at 10:01am http://revedeboomerang.free.fr/tuning2.pdf A very good link from Luc Bordes.
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joe_meadmaker Slinging.org Administrator Offline Slinging Ice is Cool! Posts: 3127 PA, USA	Re: Wartilykirri - Number 7 boomerang Reply #7 - Aug 18^th, 2023 at 11:19pm @TOMBELAINE - Great resource! Thanks for posting that.
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thabaill

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Re: Wartilykirri - Number 7 boomerang
Reply #8 - Sep 7^th, 2023 at 9:04am

TOMBELAINE wrote on Aug 17^th, 2023 at 7:07am:

The short blade is more steamlined ; it increases the range but curves the flight. The long blade is less streamlined ; it decreases the range but gives a straighter flight. This is the general design of this type of throwsticks.

Each stick is produced individually, the angles of attack of the long blade and of the short blade must be adjusted. A positive angle increases the rise and vice versa.

TOMBELAINE wrote on Aug 18^th, 2023 at 10:01am:

http://revedeboomerang.free.fr/tuning2.pdf

A very good link from Luc Bordes.

Thank you very much! Wink

I am looking for gum tree branches in order to cut one to carve and try.

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TOMBELAINE Funditor Offline Slinging Rocks! Posts: 791 france Gender:	Re: Wartilykirri - Number 7 boomerang Reply #9 - Sep 12^th, 2023 at 6:10am The two sticks are identical. Only one difference : the "7" has a hook. This hook allows the stick to bypass a shield. The "7" is pretty but, without shield, the hook is useless.
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joe_meadmaker

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Re: Wartilykirri - Number 7 boomerang
Reply #10 - Sep 12^th, 2023 at 1:21pm

I don't know if the hook would help against a shield unless the stick was used as a hand weapon. If you have other thoughts on that, I would love to hear them.

When throwing the stick, the extra "hook" portion is going to add a little weight to the striking end (at least the most effective end). I think it could also possibly add some stability to the flight. I'm not sure on that though.

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TOMBELAINE

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Re: Wartilykirri - Number 7 boomerang
Reply #11 - Sep 13^th, 2023 at 2:40am

I quote Luc Bordes who is probably one of the greatest specialists in the world.
joe_meadmaker wrote on Sep 12^th, 2023 at 1:21pm:

I think it could also possibly add some stability to the flight.

Yes but it's limited and it isn't the goal.

I made a drawing to show the usefullness of the hook. It's just an example but that how I understand.

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img315.jpg (27 KB | 42 )

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TOMBELAINE Funditor Offline Slinging Rocks! Posts: 791 france Gender:	Re: Wartilykirri - Number 7 boomerang Reply #12 - Sep 15^th, 2023 at 8:28am thabaill wrote on Sep 7^th, 2023 at 9:04am: I am looking for gum tree branches in order to cut one to carve and try. Keep us informed.
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thabaill Descens Offline Slinging Rocks! Posts: 165	Re: Wartilykirri - Number 7 boomerang Reply #13 - Sep 20^th, 2023 at 10:58am TOMBELAINE wrote on Sep 15^th, 2023 at 8:28am: thabaill wrote on Sep 7^th, 2023 at 9:04am: I am looking for gum tree branches in order to cut one to carve and try. Keep us informed. I am still searching hehehe
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CrazyBrave333

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Re: Wartilykirri - Number 7 boomerang
Reply #14 - Oct 10^th, 2023 at 6:20pm

I've been looking everywhere too - I think I read somewhere they were often made from the root section of an acacia tree where the trunk meets the roots. This is dense wood and has the right angle and the grain follows form. I havent the hear to cut down/dig up a tree for a muck around so keep an eye out for fallen branches.

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