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Wartilykirri - Number 7 boomerang (Read 1405 times)
thabaill
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Wartilykirri - Number 7 boomerang
Aug 10th, 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/

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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
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Re: Wartilykirri - Number 7 boomerang
Reply #1 - Aug 10th, 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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Re: Wartilykirri - Number 7 boomerang
Reply #2 - Aug 11th, 2023 at 8:02am
 
joe_meadmaker wrote on Aug 10th, 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 building a house, but as Toivo worked, he would occasionally throw a nail over his shoulder. When Eino asked why he was being so wasteful, he said, “The heads are on the wrong side!” Eino looked at him and said, “You dummy, those are for the other side of the house!”
 
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thabaill
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Re: Wartilykirri - Number 7 boomerang
Reply #3 - Aug 12th, 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 17th, 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 17th, 2023 at 9:13am by TOMBELAINE »  

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Re: Wartilykirri - Number 7 boomerang
Reply #5 - Aug 18th, 2023 at 5:34am
 
It's amazing how sophisticated "primative" weapons can be.
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The greatest of all the accomplishments of 20th cent. science has been the discovery of human ignorance  The main difference between genius and stupidity is that genius has it's limits.-Einstein   I'm getting psychic as I get older. Or is that psychotic?
 
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Re: Wartilykirri - Number 7 boomerang
Reply #6 - Aug 18th, 2023 at 10:01am
 
http://revedeboomerang.free.fr/tuning2.pdf

A very good link from Luc Bordes.
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Re: Wartilykirri - Number 7 boomerang
Reply #7 - Aug 18th, 2023 at 11:19pm
 
@TOMBELAINE - Great resource!  Thanks for posting that. Thumbs Up
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Re: Wartilykirri - Number 7 boomerang
Reply #8 - Sep 7th, 2023 at 9:04am
 
TOMBELAINE wrote on Aug 17th, 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 18th, 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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Re: Wartilykirri - Number 7 boomerang
Reply #9 - Sep 12th, 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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Re: Wartilykirri - Number 7 boomerang
Reply #10 - Sep 12th, 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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Re: Wartilykirri - Number 7 boomerang
Reply #11 - Sep 13th, 2023 at 2:40am
 
I quote Luc Bordes who is probably one of the greatest specialists in the world.
joe_meadmaker wrote on Sep 12th, 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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Re: Wartilykirri - Number 7 boomerang
Reply #12 - Sep 15th, 2023 at 8:28am
 
thabaill wrote on Sep 7th, 2023 at 9:04am:
I am looking for gum tree branches in order to cut one to carve and try.

Keep us informed.
Smiley
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Re: Wartilykirri - Number 7 boomerang
Reply #13 - Sep 20th, 2023 at 10:58am
 
TOMBELAINE wrote on Sep 15th, 2023 at 8:28am:
thabaill wrote on Sep 7th, 2023 at 9:04am:
I am looking for gum tree branches in order to cut one to carve and try.

Keep us informed.
Smiley

I am still searching hehehe
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Re: Wartilykirri - Number 7 boomerang
Reply #14 - Oct 10th, 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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