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Hi everyone,

I am trying to model a marine propeller (B-series propeller). In the parameter section, there is a variable named skew tip. If anyone of you can suggest what is the definition of this skew tip, or if someone can provide a formula which describes it properly

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Dear Lavesh,

it's just a user-defined design variable. The skew in this project is defined as a function of normalized radius r/R. In the screenshot you can see how it is defined from 4 points as a B-Spline-Curve:

image.png.35797d82199408a759cb138e24566f64.png

If you take a closer look at p04, you will se that it's y-component is in fact the value you choose for SKEW_TIP:

image.png.d84e50e382f51cb039622178026eaac9.png

Hence, if you modify this value you modify the value of the skew at the blade tip (maximum radius) which changes the radial distribution of skew as shown in the following animation:

SKEW_TIP.thumb.gif.aa5261af36295773d6981d08e4f751fb.gif

As a result, the blade itself will change in shape accordingly:

SKEW_TIP01.thumb.gif.b2e6d41eef75c49add0ca3689bb76a8f.gif

Hope this helps. 

Cheers,

Heinrich

image.png

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