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 Post subject: Fibreglass didge with F sharp fundamental
PostPosted: 27.02.2010, 20:48 
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Joined: 09.02.2010, 20:26
Posts: 9
I finally found the courage to build myself a fibreglass didge

I used the following resources:

Frequency Table of Musical Notes
http://www.phy.mtu.edu/~suits/notefreqs.html

DidjImp - utility to calculate the bore of the didge
http://sourceforge.net/projects/didjimp/develop

X-Ray images of yidaki
http://www.yedaki.de/bilder/schildkamp/ ... ray-en.htm
for examples

I bought fibreglass, polyester putty, acryl paint and other stuff,

used the method described here,
http://didgeridu.dead-parrot.de/didge1/ ... s/2424.htm
"Hamburger Methode" nach Ansgar Stein bzw. Frank Geipel

See the photos for the result

The didge has the following specifications:
Length: 143cm
Mouthpiece: 29mm
Bell end: 8cm
Fundamental: F sharp
1e Toot: F
Weight: 400 grams
High backpressure

The sound is ok, good enough for a first try!

- Asteronimo


Attachments:
fibreglass_didge_fsharp_2.jpg
fibreglass_didge_fsharp_2.jpg [ 130.59 KiB | Viewed 6968 times ]
fibreglass_didge_fsharp_1.jpg
fibreglass_didge_fsharp_1.jpg [ 98.01 KiB | Viewed 6950 times ]
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 Post subject: Re: Fibreglass didge with F sharp fundamental
PostPosted: 28.02.2010, 16:30 
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Joined: 29.01.2007, 19:50
Posts: 178
Location: UK
Looks pretty good , especially for your first go . Any chance of a sound clip to hear it?

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Julian


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 Post subject: Re: Fibreglass didge with F sharp fundamental
PostPosted: 28.02.2010, 17:22 
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Joined: 09.02.2010, 20:26
Posts: 9
As soon as I can find a decent microphone.
The microphone of my pc cannot handle the air pressure of the didge.

- Asteronimo


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 Post subject: Re: Fibreglass didge with F sharp fundamental
PostPosted: 02.03.2010, 09:30 
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Joined: 18.03.2006, 13:53
Posts: 925
Location: Bantry, Ireland
Interesting. The shape seemed very unusual until I thought about it a bit ;-)

At first I thought hmmm, very slim and straight until two-thirds of the way down, then plenty of taper, big backpressure for sure but....

And then I realised that the bore on many yidakis is similar, just they don't look like that because the walls are much thicker. I'll be interested to hear how it sounds too. Did you intend to put the toot "below" the fundamental? Do you slip into a toot accidentally sometimes?

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Serious Sticks Ireland


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 Post subject: Re: Fibreglass didge with F sharp fundamental
PostPosted: 02.03.2010, 18:09 
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Joined: 09.02.2010, 20:26
Posts: 9
To answer your questions:
Yes, you can see the shape of the bore on the outside
because the outside follows the shape of the inside.
The walls are about 5mm thick.
No I didn't intend to put the toot below the fundanental.
It is about an octave higher but I intended it to be the same
as the fundamental instead of F.
No I don't slip into an overtone accidentally.
But due to the thin walls the sound is rich in harmonics.

I will upload a sound clip an an image of the sound spectrum
as soon as I have a decent microphone.


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 Post subject: Sound sample of fiberglass didge
PostPosted: 06.03.2010, 18:38 
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Joined: 09.02.2010, 20:26
Posts: 9
Here is a sound sample


Attachments:
didge_F#_F.mp3 [344.11 KiB]
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 Post subject: Re: Fibreglass didge with F sharp fundamental
PostPosted: 11.03.2010, 18:30 
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Joined: 18.11.2009, 12:40
Posts: 33
A surprisingly "dark" sounding didj, which, I had originally expected to sound like a PVC pipe. I can't see the interior but I'll bet it is NOT smooth? Sounds like bore walls have some complexity. Did I guess correctly :D ?


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 Post subject: Re: Fibreglass didge with F sharp fundamental
PostPosted: 13.03.2010, 15:04 
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Joined: 09.02.2010, 20:26
Posts: 9
Most people expect a fiberglass didge to sound like a pvc pipe.
That would be the case if the diameter is roughly the same from
mouthpiece to bell end and if the interior is smooth.

The interior of this didge has some complexity like texture and "folds"
caused by the conical shaped bag that was used to make it.

So, yes, you are right ;-)


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 Post subject: Re: Fibreglass didge with F sharp fundamental
PostPosted: 13.03.2010, 15:29 
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Joined: 18.11.2009, 12:40
Posts: 33
Yep I love craggy, complicated bores as I think they result in more complex sound. Lots of wave reflecting going on, maybe? I wish I could build fiberglass didjes simply to evaluate certain bore profiles and their effect on sound. My latest theory is that deviations from straight bore, like S-shaped bends and other curves, have great impact on sound. This, even though the sound physics guys have said it is insignificant.


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 Post subject: spiral like shape
PostPosted: 14.03.2010, 07:24 
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Joined: 09.02.2010, 20:26
Posts: 9
Building a fiberglass is not all that difficult,
it is just tedious and messy work ;-)
Now that I know how to do it I can start changing things
like the straight form.
My next fiberglass didge will have a subtle spiral like shape.


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 Post subject: Re: Fibreglass didge with F sharp fundamental
PostPosted: 14.03.2010, 13:26 
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Joined: 18.11.2009, 12:40
Posts: 33
Spiral? That's an awesome idea. You could have a very long bored, low keyed didj which after it was coiled would be very short, and very portable. Please let us hear and see the final product.


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