Welcome to
the forums at bobdunsire.com
bobdunsire.com forums bobdunsire.com forums
You can reset your password by going here. Be sure to try your current email and any email addresses you may have had in the past.
Otherwise please use the Contact Us link at the bottom of the forums. In order to help you, please provide the following info: Your Display Name from the old forum and any possible email addresses you would have used before. Without that info we cannot locate your account.


Go Back   Bob Dunsire Bagpipe Forums > Great Highland Bagpipe > Beginners, Intermediate, +
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Beginners, Intermediate, + Discuss issues, tackle problems, share experiences, ask questions, and look for specific help...

Platinum Sponsors
Reply
 
Thread Tools
Old 01-17-2019, 06:02 PM   #11
el gaitero
Holy smoking keyboard!
 
Join Date: Feb 2005
Location: Estados Unidos
Posts: 6,367
Default Re: Losing air at bass drone

Quote:
Originally Posted by Keith H View Post
Well, I have managed to zero in on the reed and now am getting an avg of 1.20 following Bruce's test. So I'm happy now. Ended up opening the tongue the whole way and slowly bringing it back. Thanks

Do you know what n20 chanter reed strength?
el gaitero is offline   Reply With Quote
Gold Sponsor
Old 01-17-2019, 06:03 PM   #12
Keith H
Forum Member - Shy or Quiet
 
Join Date: Jan 2018
Location: Ontario Canada
Posts: 9
Default Re: Losing air at bass drone

Quote:
Originally Posted by DapperDan View Post
Is the tongue on the bass reed airtight? I mean if you mouth-blow the reed until it shuts, does air still get through? I had this issue recently and retired a set of reeds because of it.
From what I understand this used to be a standard test for cane reeds, and I would think applies to synthetics, though I don't hear about it much.

Edit: I believe Bruce Hitchings addresses this in the linked video, I watched it recently, so sorry to be redundant

Hi Dan, I narrowed in on the bass reed and ended up opening it all the way and slowly little by little closing it up. Hit pay dirt so I'm getting avg 1.20 when checking the whole bag. Being redundant isn't a bad thing it mean you, Wil and Jim had the right path. Thanks
Keith H is offline   Reply With Quote
Old 01-17-2019, 06:09 PM   #13
Keith H
Forum Member - Shy or Quiet
 
Join Date: Jan 2018
Location: Ontario Canada
Posts: 9
Default Re: Losing air at bass drone

Thanks everyone for the good tips Got it and the bass reed was the problem (not counting me).

As explained I ended up opening the tongue then slowly closing it up until it sealed properly. Also clean it.


Well it's all part of the fun, right


Cheers and thanks
Keith H is offline   Reply With Quote
Old 01-18-2019, 11:21 AM   #14
el gaitero
Holy smoking keyboard!
 
Join Date: Feb 2005
Location: Estados Unidos
Posts: 6,367
Default Re: Losing air at bass drone

Quote:
Originally Posted by will103 View Post
Hi Keith, I had the same problem. I found this useful:

https://www.youtube.com/watch?v=Mc4ACA1WYcg

Ta will
Iíve met Bruce ..great chap. Iíve always meant to give him a bell to ask why ..at 2:55. ..he states the reeds ( tongues) are closed more than they are open.

To me its one or the other...in equal amounts ..on /off,..open/ closed ..it canít be more of one than the other.

Did I mishear it?

This method is a great set up tool for anybody. I have anybody I work with on pipes do this regularly for their own epiphany moment.
el gaitero is offline   Reply With Quote
Old 01-18-2019, 12:46 PM   #15
CalumII
Holy smoking keyboard!
 
Join Date: Feb 2002
Location: London Town
Posts: 5,188
Default Re: Losing air at bass drone

Quote:
Originally Posted by el gaitero View Post
why ..at 2:55. ..he states the reeds ( tongues) are closed more than they are open.

No, he's correct. The reed is open. Air rushes through: the Bernoulli effect means the pressure above the reed is higher than underneath, so the tongue is pressed onto the reed body and held there by air pressure.


A wave front from the tongue clapping shut now moves up the drone. At the far end, it reflects from the open end and travels back down, moving at the speed of sound. When it reaches the reed, it flips the tongue open again. Air immediately starts moving through, creating a Bernoulli effect, and....notice how the tongue was clamped down on the reed for most of that.



(this isn't perfectly accurate from a physics perspective, but it's a pretty good model for thinking about what's going on and predicting how things affect the sound)
CalumII is offline   Reply With Quote
Old 01-18-2019, 01:30 PM   #16
el gaitero
Holy smoking keyboard!
 
Join Date: Feb 2005
Location: Estados Unidos
Posts: 6,367
Default Re: Losing air at bass drone

... when the drone is in tune,..on an ocilliscope the amplitude and wavelength show up as being mirror image equal above and below the x axis.
el gaitero is offline   Reply With Quote
Old 01-18-2019, 05:14 PM   #17
Keith H
Forum Member - Shy or Quiet
 
Join Date: Jan 2018
Location: Ontario Canada
Posts: 9
Default Re: Losing air at bass drone

Quote:
Originally Posted by el gaitero View Post
Do you know what n20 chanter reed strength?

Sorry got me on that n20? Chanter reed is easy but actual strength I don't have the means to measure that.
Keith H is offline   Reply With Quote
Old 01-18-2019, 05:17 PM   #18
el gaitero
Holy smoking keyboard!
 
Join Date: Feb 2005
Location: Estados Unidos
Posts: 6,367
Default Re: Losing air at bass drone

Quote:
Originally Posted by Keith H View Post
Sorry got me on that n20? Chanter reed is easy but actual strength I don't have the means to measure that.

Jori Chisholm sells a manometer set up for pipes..used to check how steady air pressure one is playing ( = steady tone)..also convenient to confirm strength of preferred chanter reeds ...especially when ordering.
el gaitero is offline   Reply With Quote
Old 01-18-2019, 05:25 PM   #19
Keith H
Forum Member - Shy or Quiet
 
Join Date: Jan 2018
Location: Ontario Canada
Posts: 9
Default Re: Losing air at bass drone

Quote:
Originally Posted by el gaitero View Post
Jori Chisholm sells a manometer set up for pipes..used to check how steady air pressure one is playing ( = steady tone)..also convenient to confirm strength of preferred chanter reeds ...especially when ordering.

Assumed that might be what you were referring to. Worth looking into. Appreciate the tip.
Keith H is offline   Reply With Quote
Old 01-19-2019, 10:11 AM   #20
CalumII
Holy smoking keyboard!
 
Join Date: Feb 2002
Location: London Town
Posts: 5,188
Default Re: Losing air at bass drone

Quote:
Originally Posted by el gaitero View Post
... when the drone is in tune,..on an ocilliscope the amplitude and wavelength show up as being mirror image equal above and below the x axis.

Yes. But that doesn't tell you anything about the reed tongue cycle.
CalumII is offline   Reply With Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Silver Sponsor

All times are GMT -7. The time now is 07:30 AM.