Propeller with bell lift distribution has best thrust/power ratio?

In summary, propellers with bell lift distribution have been found to have the best thrust-to-power ratio compared to other propeller designs. This is due to the unique shape of the bell lift distribution, which allows for more efficient air flow and increased thrust. This design has been used in various aircraft and has shown to improve overall performance and fuel efficiency.
  • #1
John Mcrain
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This source http://sustainableaviation.org/sas2017/session/prandtl-wing-maximum-efficiency/index.html claims : "Bell lift distribution can be applied to propulsion systems (no more “minimum induced loss”). We believe this results in a gain of 15.4% thrust for the same input torque/power."

Bell lift distribution has constraint root bending moment(driving blade structural mass), but blade structural mass is completely irrelevant for propeller aerodynamics.

How then bell lift distribution has best thrust/power ratio?
Does anyone know something about that,because this not topic that you learn at university...I believe very few people know something about that in detail...

Bell theory basics:

https://digital.library.unt.edu/ark:/67531/metadc53315/m2/1/high_res_d/19760012005.pdf

http://aerocrafty.blogspot.com/2013/06/bell-shaped-lift-distribution.html
 
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  • #3
berkeman said:
Is this a continuation of your previous thread?

https://www.physicsforums.com/threa...tribution-for-best-thrust-power-ratio.999433/
I think it is best to open new one, only for this specific topic ...

Here is some basic bell theory:

https://digital.library.unt.edu/ark:/67531/metadc53315/m2/1/high_res_d/19760012005.pdf

http://aerocrafty.blogspot.com/2013/06/bell-shaped-lift-distribution.html

As you can see,it has integrated root bending moment constraint...
 

1. What is a propeller with bell lift distribution?

A propeller with bell lift distribution is a type of propeller design where the blade shape gradually changes from the root to the tip, resulting in a more efficient distribution of lift along the blade span. This design is often used in aircraft and marine propellers to improve performance.

2. How does a propeller with bell lift distribution affect thrust and power ratio?

A propeller with bell lift distribution can improve the thrust/power ratio by reducing the amount of power needed to turn the propeller while still maintaining a high level of thrust. This is because the bell-shaped blade design creates less drag and more lift, resulting in increased efficiency.

3. What are the advantages of using a propeller with bell lift distribution?

Some advantages of using a propeller with bell lift distribution include improved efficiency, reduced noise and vibration, and better handling in different flight or water conditions. This design also allows for a wider range of operating speeds and can withstand higher loads.

4. Are there any disadvantages to using a propeller with bell lift distribution?

One potential disadvantage of using a propeller with bell lift distribution is that it can be more complex and expensive to manufacture compared to other propeller designs. Additionally, the bell-shaped blades may be more susceptible to damage from debris or rough water conditions.

5. How does a propeller with bell lift distribution compare to other propeller designs?

Compared to other propeller designs, a propeller with bell lift distribution typically offers a higher thrust/power ratio and improved efficiency. However, it may not be suitable for all types of aircraft or watercraft and may have higher maintenance costs. Ultimately, the best propeller design will depend on the specific application and performance requirements.

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