Introduction: How to Make a Bullroarer

Picture of How to Make a Bullroarer

Bullroarers are a ceremonial noisemaker, toy and signaling device. They are native to many parts of the world, including Australia, Scandinavia, Mali, the British Isles, and all over the Americas. Bullroarers make a distinct, low-pitched sound that can travel for long distances. Above all, they are interesting and fun to use!


Make sure to post pictures of your finished bullroarers!



Here are my answers to the Make-to-Learn contest questions:

What did I make?
A bullroarer! How they work: As they rotate around you, they also rotate on the string; this in turn vibrates the air, producing sound. Tools I used: a hatchet and mallet, drawknife, a hair-dryer, and my pocketknife. Materials: a piece of cedar, jute twine and some beeswax.

How did I make it?
I first learned of them when my assistant scoutmaster brought one of his to an event. I then decided to make one. I make them on my own. In this case I was making it for someone else, to be shaped similarly to one I had already made, so it stayed the same.

Where did I make it?
I made it at home in my garage workshop. I made this one for someone in my scout troop.

What did I learn?
I learned that I need to make future bullroarers heavier. There weren’t any challenges or surprises. I like the beeswax finish on the cedar wood. When I make another one, I will make it a bit heavier.

Step 1: Design

Picture of Design

First, a quick explanation on how they work. As they rotate around you, they also rotate on the string; this in turn vibrates the air, making sound.

 The design of the bullroarer is mostly a matter of taste. As far as I know, any shape will work as long as it's not too wide or heavy.
Here are a few links that provide some great information:

http://www.stevemarshall.org.uk/flint_bullroarers.htm
http://www.knifeforums.com/forums/showtopic.php?tid/865754/
http://en.wikipedia.org/wiki/Bullroarer_(music)

Step 2: Materials and Tools

Tools I use:

Hatchet and mallet for splitting
Draw knife for rough shaping
Pocket knife for final shaping
Drill and bit for making the string hole

Materials:

Wood
      I typically use cedar because it is plentiful around my house, not to mention beautiful, but any type of wood will work.

About 5' of string

A finish of some sort
      I use beeswax but you could use a finish of any type.

Step 3: Split

Picture of Split

 If you are using a log like I did, you will need to split it to get a reasonably sized piece.

At the desired length of the finished bullroarer, plus some extra for wiggle room, saw to a depth of approximately 1/2"
(My saw cut was at 11.5" and my bullroarer had a finished length of 10.5").

Next, line up your hatchet on the end of the log with the bottom of the saw cut and pound it in with your mallet.

It should pop off with little effort and you should now have a piece that will be reasonably sized to shape.

Step 4: Shape

Picture of Shape

Time to shape! 

Just go at it! Make sure to pay attention to the grain as to not take off more than you wanted.

I used a draw knife up until the third picture and a pocket knife after that.

When you get it to the size and shape you want, you need to drill a hole for the string. The size of the hole doesn't matter, just as long as the string can pass through and leave enough wood to retain strength.

Now you should test it out to see if it's working how you want it to. If its too heavy it won't rotate on the string fast enough and therefore won't vibrate the air enough. if it's too light it won't create enough momentum and therefore will make it hard to keep going.

Step 5: Finishing Touches

Picture of Finishing Touches

Almost done! The only cosmetic work I did on this one is wax it. but you could do all kinds of things. You could stain it, carve it, do some pyrography or a painting, ect.

Next you need to string it. On this one, I just looped it through the hole. Not essential, but I highly recommend a handle for the prevention of blisters. Experiment on the string length; find what is most comfortable to swing and put it there.

Step 6: Use

Picture of Use

You've finally finished your first bullroarer and its time to try it out. Great!

To get it whirling, you have to twist the string a good bit. Then, just give it a few feet of slack and spin it around, above your head.

The goal isn't to whip it around as fast as you can; spin just fast enough so that its outward momentum keeps it up.

If it still doesn't sound, try twisting the string more.

Enjoy!

Comments

Wiley (author)2017-10-08

Hey sweet, nice job! We used to make these when I was your age in scouts, and after a trip to Australia I finally learned about how they are used for signalling and communicating. There is a defined "language" depending on what you spin and how fast.

FrankI7 (author)2015-11-29

Thought you might like to know - My Scout troop is working on Woodwork Merit Badge this month. Each of our Scouts is making 2 bull roarers during our meetings - 1 to keep, and one as a Christmas gift for an underprivileged child. The guys are really enjoying making a toy by hand.

evaB13 (author)2015-10-08

My dad says I need to make q child's one is there such a thing as a child's bull roarer?

Drake78 made it! (author)2015-03-05

Made mine out of hard Redwood and shoe string that I molded and sanded when I was recovering from surgery the sound is astounding and when you mold it yourself it's like nothing else

cap n crunch (author)Drake782015-03-05

That's great! I'm glad to see that someone benefited from the Instructable!

MrE (author)2013-02-13

It's the call of the Jarro Jarro bird! http://aso.gov.au/titles/features/crocodile-dundee-II/clip2/

ethiran (author)MrE2013-03-24

Okay, it doesn't sound like a bird.
But it sounds like a roaring motor.

MrE (author)ethiran2013-03-24

My comment was more of a joke. Click on the link and it opens a part of the crocodile dundee movie that shows a bullroarer in use as a telephone call. I guarantee a safe link as well

ethiran (author)2013-03-24

I made one of this, but I made an ugly one.
But I may like making it on a bamboo because it is easier.
I made one made of a smooth wood so I had a hard time doing it.

mammasboy (author)2013-02-14

oh i'm definitely making one of these

Orngrimm (author)2013-02-14

"if it's too light it won't create enough momentum and therefore will make it hard to keep going."
If it happens to be too light, add a small lead-ball (around 10-50 grams) just to the base of the bullroarer on the string and try it again. Add more of those (fishing) weights until it has enough momentum again.
this way, you can make a higher pitch (Because it rotates faster) but still have enough momentum to swing it around.
--> The small round leadweights on the string dont interfere with the speed of rotation of the wood itself.

awesomecreations (author)2013-02-13

I honestly clicked the picture to get here because I thought this was some kind of cool miniature surfboard!

It is a miniature surfboard - A roaring miniature surfboard.

Cool, Cap n Crunch. I had wondered if these were tricky to make or if they had some kind of special cross section. Now I know!

GorillazMiko (author)2013-02-12

The end result came out awesome. Great Instructable!

GM

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Bio: Hi, I'm Seth, I am first and above all a follower of christ; I live to glorify God in all that I do and ... More »
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