Propeller blade lift distribution for best thrust/power ratio?

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SUMMARY

The discussion centers on determining the ideal lift distribution for propeller blades to achieve the best thrust-to-power ratio. Key factors include minimizing drag, which directly affects torque and power output. The conversation highlights that the optimal design varies based on the type of propeller (helicopter, low-speed personal aircraft, high-speed turboprop) and the specific operational parameters such as altitude and airspeed. A comprehensive understanding of propeller design principles is essential, as there is no one-size-fits-all solution.

PREREQUISITES
  • Understanding of propeller aerodynamics
  • Familiarity with torque and power calculations
  • Knowledge of different types of propellers (helicopter, turboprop)
  • Basic principles of drag and lift forces
NEXT STEPS
  • Research optimal aircraft propeller design techniques
  • Study the impact of drag on propeller efficiency
  • Explore propeller blade shape and size variations
  • Learn about the relationship between RPM and torque in propeller performance
USEFUL FOR

Aerospace engineers, propeller designers, and aviation enthusiasts interested in optimizing propeller performance for various aircraft types.

John Mcrain
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What is ideal lift distribution for propeller blade to get best thrust/power ratio?

To do this blade must has minimum drag, because drag releted to torque,and torque x RPM= power..
 
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Good question. What kind of propeller blade? (helicopter, low-speed personal aircraft, high-speed turboprop, etc.) What size of propeller? Over what range of altitudes and airspeeds?
 
I would assume that every modern propeller made by propeller companies is optimal for the range of parameters specified. But they are not all alike.
 
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berkeman said:
Good question. What kind of propeller blade? (helicopter, low-speed personal aircraft, high-speed turboprop, etc.) What size of propeller? Over what range of altitudes and airspeeds?
low speed propeller,let say at 150km/h...

Size depends on how much thrust do I need, but it is irrelevant for my question because I ask in general for best lift distribution..
 
There is no single answer. You are asking for a formula or a curve when what you need is a textbook on propeller design.
 
John Mcrain said:
Size depends on how much thrust do I need, but it is irrelevant for my question because I ask in general for best lift distribution..
1612738261123.png

https://i.ytimg.com/vi/uOHckOudGGQ/maxresdefault.jpg

Versus:
1612738338468.png

https://hartzellprop.com/wp-content/uploads/Voyager-Propeller.jpg

Versus:
1612738382715.png

https://hartzellprop.com/wp-content/uploads/Cessna-177B.jpg
 
Engineering Step 1: Specify the problem.
 
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