After deciding to make an air raid siren for my science project, I started making sketches of my visualization for the project.
General Concept Sketch:
Video Analysis:
This video shows the main components needed to build a small air raid siren using 3D-printed parts.
The second video I used to develop my air raid siren plan was this video. Although it’s a larger wooden air raid siren, this video was crucial as it explains more of the technical aspects of building an air raid siren, such as the blades’ configuration and the number of ports for an air raid siren.
Video Analysis Summary:
The sound of the air raid siren is created from the chopping of air from the blades and port of the air raid siren. The major components of the air raid siren are blades, outer case, motor, and battery. Also, the video gives me ideas on how to modify the air raid siren since I have time constraints, and won’t be building a huge one.
Final design:
For the final design, I modified the turbine to a 5/6 port due to the motor’s torque. Also, this configuration allows the siren to have a dual-tone sound, which will sound better. More importantly, some design changes I made were the turbine now faces upward because facing sideways might cause the turbine to spin off, and requires substantially more 3D printing components.
Materials Needed:
x1 Brushless DC motor
x1 Battery pack
x1 Switch or Controller
x1 Siren blades (3D print)
x1 Siren case (3D print)
Blade/Turbine Planning:
Turbine Diameter: 6cm
On the planning sheet, I labeled the height as 2cm. However, later I changed it to 4cm after realizing 2cm might be too thin.
3D modeling of the turbine:
Outer case:
I decided I’m just going to make a 3D model because making the outer case is basically remodeling the diameter of air raid siren and make sure the ports are the same size as the ports of the air raid siren
The final model of the air raid siren:
The next step is to 3D print the two parts of the air raid siren
Schedule Plan:
For the science 14-day project, there will be 6 lessons in total. However, I will be missing 2 lessons due to school activities. Therefore, I need to keep up with a strict schedule:
Day 1: Research Projects that are interesting
Day 2: Missed
Home: 3D model the turbine
Day 3: 3D print turbine
Home: 3D model the case
Day 4: Missed (Hopefully can 3D print the case)
Day 5: Assembly
Day 6: Final Assembly and take video for the blog post
Success Criteria:
- Complete the project within the time limit following the schedule
- The siren creates an air raid siren whistle sound at least 80 decibels from 1m away
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Most of the people agree that the siren is visually appealing