DIY Propeller for Homemade Car

[goorioles747]

Hi,
I need to make a propeller using either soda bottle plastic or cardstock. I think I can come up with a mechanism to spin it with a rubber band, but, I need an efficient propeller that creates enough power to move the car I am building. Any ideas/possible designs?

 

[russ_watters]

Two concepts are critical to propeller efficiency:
-Camber: The propeller blades have to be curved to re-direct the airflow.
-Twist: The propeller blade has to be twisted to provide a steeper angle of attack at the center than at the tips (the tips are almost flat in the direction it spins). this is so that the velocity distribution along the blad is constant.

 

[oswaler]

Hello there,

I would suggest considering the following factors when designing your DIY propeller for your homemade car:

1. Blade shape and size: The shape and size of the blades will greatly affect the efficiency of your propeller. A wider and more curved blade will create more thrust, while a narrower and flatter blade will create less drag. Experiment with different shapes and sizes to find the optimal design for your propeller.

2. Angle of attack: The angle at which the propeller blades meet the air can also impact its efficiency. A steeper angle of attack will create more lift and thrust, but may also create more drag. Again, experimentation will help determine the best angle for your propeller.

3. Material: The materials you use for your propeller can also affect its efficiency. Plastic or cardstock may work, but they may not be the most durable or aerodynamic materials. Consider using lightweight and strong materials such as carbon fiber or aluminum for better performance.

4. Balance: It is important to ensure that your propeller is balanced to prevent vibration and reduce drag. You can achieve this by carefully shaping and trimming the blades, or by adding small weights to balance them.

5. Power source: The power source for your propeller, in this case, a rubber band, will also play a role in its efficiency. Make sure to use a strong and high-quality rubber band to generate enough power for your car.

Overall, the key to designing an efficient propeller for your homemade car is experimentation and testing. Don't be afraid to try different designs and materials until you find the best one for your project. Good luck!