57es revision #2, helicopter rotor .

Wing one of five, with detail views of tip .

External surface .

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This introduces a modified cross-section formula which thickens the wings as they approach their trailing edge(s) ;

the formula also has the effect of noticeably changing the wings' streamlining near their base .

The degree of thickening can be adjusted, and i chose to write it to sacrifice relatively little efficiency, (the heavier trailing edge will by its nature sacrifice some) .

I did this because my feeling is that the revision #1, (and previous), cross section formula defines wings that become too thin, (fragile), near the tips at their trailing edges to be used for field helicopters ; an application of importance .

Should this design be matured into military roles where ballistic impact resistance is required, the formula can be rewritten to provide additional trailing half / trailing edge thickness .

The heavier edges will produce stronger trailing wakes and turbulence than otherwise ; but i feel that this will prove to be within what the serrated wings can handle,

enabling a helicopter equipped with this, (or a descended), rotor set to achieve a higher top speed than currently possible .

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Other changes from the 57es revision #1, (posted 16 July, 2010), include a smaller radius at the hub paired with a longer taper, to effectively 'start' the wing farther from center, reducing turbulence and drag across the hub ;

and a code override of the default application handling of initial and final (parametric) inputs, to make joins, (as rendered), tighter and more accurate .

A notes correction / clarification, (mentioned and shown in the 57aises wind turbine post of 19 July, 2010) :

The floor plan line for the inside of the trailing edge is slightly farther from the wing's centerline than it would have been in a smooth winged model, such as the 55, (posted on 8 and 13 May 2010) .