Propeller blade lift distribution for best thrust/power ratio?

[John Mcrain]

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..

 

[berkeman]

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?

 

[anorlunda]

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.

 

[John Mcrain]

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..

 

[anorlunda]

There is no single answer. You are asking for a formula or a curve when what you need is a textbook on propeller design.

 

[berkeman]

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..

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

Versus:

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

Versus:

https://hartzellprop.com/wp-content/uploads/Cessna-177B.jpg

 

[jrmichler]

Try searching optimal aircraft propeller design. This hit looks good: https://journals.sagepub.com/doi/full/10.1177/1687814019865071

 

[russ_watters]

Engineering Step 1: Specify the problem.