I designed the first model with some ludicrous dimensions. REV01 was enormous and made no sound. I reduced the dimensions in my drawing and tightened the air duct between the mouthpiece and fipple to better collimate the airflow. REV02 failed to print completely, but I could blow into it, not that it made any sound. I was getting frustrated balancing all the factors necessary to make a whistle.
• Fipple size
• Air duct cross-section
• Distance between air duct exhaust and fipple edge
• Cavity volume.
I did not have any guess about fipple size, but I assumed more was better. I knew that a narrow air duct was preferable, and my first versions were way too wide. I was guessing at the distance, but I assumed the closer the better, so the air exited the duct and stayed in a uniform path before it could experience much turbulence. Cavity size should determine the whistle's tone, with larger cavities producing lower-pitched notes. REV03 was an experimental design where the top and bottom printed in different parts and I would fit them together with a long M3 bolt. I choked the air duct as small as I thought I could go and made two cavities with different volumes. When I laid the top on the bottom, it did not work, but when I installed a bolt and positioned the halves approximately 3mm apart, the whistle was loud! The smaller cavity was a higher pitch, as I expected.
The rest of the posts for this project have been arranged by date.
GitHub repo for CylinderWhistle.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Completed projects from year 11
Completed projects from year 12
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2026-01-31
• Fipple size
• Air duct cross-section
• Distance between air duct exhaust and fipple edge
• Cavity volume.
I did not have any guess about fipple size, but I assumed more was better. I knew that a narrow air duct was preferable, and my first versions were way too wide. I was guessing at the distance, but I assumed the closer the better, so the air exited the duct and stayed in a uniform path before it could experience much turbulence. Cavity size should determine the whistle's tone, with larger cavities producing lower-pitched notes. REV03 was an experimental design where the top and bottom printed in different parts and I would fit them together with a long M3 bolt. I choked the air duct as small as I thought I could go and made two cavities with different volumes. When I laid the top on the bottom, it did not work, but when I installed a bolt and positioned the halves approximately 3mm apart, the whistle was loud! The smaller cavity was a higher pitch, as I expected.
 |
| REV01, REV02, and REV03 with two cavities |
The rest of the posts for this project have been arranged by date.
GitHub repo for CylinderWhistle.
First time here?
Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8
Completed projects from year 9
Completed projects from year 10
Completed projects from year 11
Completed projects from year 12
Disclaimer for http://24hourengineer.blogspot.com and 24HourEngineer.com
This disclaimer must be intact and whole. This disclaimer must be included if a project is distributed.
All information on this blog, or linked by this blog, is not to be taken as advice or solicitation. Anyone attempting to replicate, in whole or in part, is responsible for the outcome and procedure. Any loss of functionality, money, property, or similar, is the responsibility of those involved in the replication.
All digital communication regarding the email address 24hourengineer@gmail.com becomes the intellectual property of Brian McEvoy. Any information contained within these messages may be distributed or retained at the discretion of Brian McEvoy. Any email sent to this address, or any email account owned by Brian McEvoy, cannot be used to claim property or assets.
Comments to the blog may be utilized or erased at the discretion of the owner. No one posting may claim property or assets based on their post.
This blog, including pictures and text, is copyright to Brian McEvoy.
2026-01-31
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