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

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SUMMARY

The discussion centers on the advantages of bell lift distribution in propeller design, specifically its ability to achieve a 15.4% increase in thrust for the same input torque and power, as stated by the source from Sustainable Aviation. While bell lift distribution is constrained by root bending moment, this factor does not significantly impact propeller aerodynamics. The conversation highlights the need for deeper understanding of this topic, which is not typically covered in academic settings.

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  • Understanding of bell lift distribution principles
  • Familiarity with propeller aerodynamics
  • Knowledge of torque and power relationships in propulsion systems
  • Basic grasp of structural constraints in engineering design
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Aerospace engineers, propeller designers, and students interested in advanced propulsion systems and aerodynamics will benefit from this discussion.

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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