max camber and thickness of Propellers

[Mr. Paul Riesen 0]

Hi,

 

I am currently working on my bachelor thesis. The Blade Analysis Tool is quit useful for me. The only thing is that I can’t get the max camber value out of the analysis.

Looks like the max camber value and max thickness are not a value/distance but a distribution over chord length?!?

If I measure the max thickness from the 2D-Plot I get the same results like the PPF gives. Unfortunately, the PPF does not come with the camber value. How do I get the value without plotting everything and measure everything? Then FFW could optimize also with a Lifting Line Code.

 

Regards,

Paul

[Jörg 29]

Hi Paul,

 

Are you calling the command

 

 

bladeanalysis(...)

 

in the console (or do you use the PFF import)? This gives you the max camber values and max thickness values as a function of the normalized radius! It is not a function of the radius or similar.

 

See the attachment: these points give you the max camber values (y-coordinate) at a specific radius (x-coordinate). The interpolation of these values generates the radial distribution.

 

Is this your question?

 

Cheers

Joerg

[Mr. Paul Riesen 0]

Hi Joerg,

 

thanks for the quick reply! I use the “bladeanalysis(…)” Feature.

 

If I understood you correctly my camber value for r/R=0,2 is 8% of the radius?

 

And the max thickness value is 26,8%?

 

All other values match the 2D plots.

What could be the reason for these unsatisfying results?

 

Many thanks in advances!

Paul

 

 

[Jörg 29]

Hi Paul,

 

In your first screenshot you have a point at r/R of approx. 0.2 (the first point of your spline). The y-coordindate of this point is 0.08. This means that the max camber value is 8% of the chord length, at a radius of r/R=0.2.

 

The same thing for thickness: the values are normalized wrt the chord length.

 

Does this help?

 

Cheers

Joerg

[Mr. Paul Riesen 0]

:)  Yes, that’s is. Thanks for the food for thoughts…