Quote:
Originally Posted by 3-Wheeler
I think that there may be a rendering problem with the airfoil shape from 70% to 100% length. I made several larger circles (shown in forth picture with blue line) that hugged the airfoil from 70% t0 90%, then veered away from the airfoil from 90% to 100%.
The next picture shows how shallow the airfoil shape is in this region. If anyone has any ideas, please let me know.
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The airfoil is not a continuous arc. It flattens toward the end.
Continuous arcs were tried as airfoils, but found to be inferior because the pressure recovery at the rear is not ideal and separation occurs.
The way that most people copy a shape like this is to take measurements of the "drop" at different stations along the airfoil, then transfer those measurements to the pattern. Use a flexible "stringer," such as a long, thin piece of wood to connect the "dots" and define the final shape.