I have scaled a NASA/Langley LS(1)-0413 airfoil to a 90 inch chord length, and now the trailing edge is 0.5in. Any longer chord length would have a larger trailing edge thickness.
This doesn't seem right, I have not witnessed a non-supercritical airfoil with a trailing edge larger than a .25in.
First off, do long chord length wings using the low and medium-speed airfoils have thick blunt trailing edges?
Secondly, if medium speed wings don't have blunt trailing edges how does industry taper the trailing edge? Is it assumed they will be rounded off, or sanded to a point? Should one remove from the bottom concave surface or remove from the top surface? Both will alter the exit angle of the airstream.
Thirdly, is there an ideal length chord for the NASA/Langley low and medium-speed airfoils, e.g. do they really only apply to a 36in chord lenght? Does scale matter?