NACA aerofoils

siw · October 29, 2013, 08:52

Hi,

The equation for 4-digit symmetrical NACA aerofoils (see http://en.wikipedia.org/wiki/NACA_airfoil) when plotted gives a blunt trailing edge. But images of these aerofoils all show sharp trailing edges.

Are these aerofoils adjusted from the equation so that the trailing edge is sharp?

Thanks

truffaldino · October 29, 2013, 11:00

Naca 4 digits have blunt edges, but the difference is almost neligible

In wikipedia they also write:

"Note that in this equation, at (x/c) = 1 (the trailing edge of the airfoil), the thickness is not quite zero. If a zero-thickness trailing edge is required, for example for computational work, one of the coefficients should be modified such that they sum to zero. Modifying the last coefficient (i.e. to -0.1036) will result in the smallest change to the overall shape of the airfoil."

October 29, 2013, 08:52	NACA aerofoils	#1
siw Senior Member Stuart Join Date: Jul 2009 Location: Portsmouth, England Posts: 733 Rep Power: 25	Hi, The equation for 4-digit symmetrical NACA aerofoils (see http://en.wikipedia.org/wiki/NACA_airfoil) when plotted gives a blunt trailing edge. But images of these aerofoils all show sharp trailing edges. Are these aerofoils adjusted from the equation so that the trailing edge is sharp? Thanks

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October 29, 2013, 11:00		#2
truffaldino Senior Member Join Date: Jan 2011 Posts: 249 Blog Entries: 5 Rep Power: 17	Naca 4 digits have blunt edges, but the difference is almost neligible In wikipedia they also write: "Note that in this equation, at (x/c) = 1 (the trailing edge of the airfoil), the thickness is not quite zero. If a zero-thickness trailing edge is required, for example for computational work, one of the coefficients should be modified such that they sum to zero. Modifying the last coefficient (i.e. to -0.1036) will result in the smallest change to the overall shape of the airfoil."