## NACA Airfoild 6 serie nomenclature

## NACA Airfoild 6 serie nomenclature

(OP)

I have a old drawing with he following nomenclature for an NACA airfoil

NACA 64(9.5)8

Can some one tee]ll me how to interprete the number in parantheses?

In additio the the NACA airfoild I have the leading and traling edge raduis, the corde lenght the setting angle and a sketch of the profile showing the location of maximum camber (x,y location for the leading edge)

Noone in the company know how to recreate the profile

Tank you

NACA 64(9.5)8

Can some one tee]ll me how to interprete the number in parantheses?

In additio the the NACA airfoild I have the leading and traling edge raduis, the corde lenght the setting angle and a sketch of the profile showing the location of maximum camber (x,y location for the leading edge)

Noone in the company know how to recreate the profile

Tank you

## RE: NACA Airfoild 6 serie nomenclature

## RE: NACA Airfoild 6 serie nomenclature

I look at the NAC report and there is at least 2 interpretation of the nomenclature:

one it that the number in parathese is the modify thickness

the second is that the number in parenthese is the lift coeficent.

I want to be able to model the profile to analys the fan blade

## RE: NACA Airfoild 6 serie nomenclature

"6-series

An improvement over 1-series airfoils with emphasis on maximizing laminar flow. The airfoil is described using six digits in the following sequence:

The number "6" indicating the series.

One digit describing the distance of the minimum pressure area in tens of percent of chord.

The subscript digit gives the range of lift coefficient in tenths above and below the design lift coefficient in which favorable pressure gradients exist on both surfaces

A hyphen.

One digit describing the design lift coefficient in tenths.

Two digits describing the maximum thickness in tens of percent of chord.

For example, the NACA 612-315 a=0.5 has the area of minimum pressure 10% of the chord back, maintains low drag 0.2 above and below the lift coefficient of 0.3, has a maximum thickness of 15% of the chord, and maintains laminar flow over 50% of the chord."

One often sees the third (subscript) digit eliminated in scholarly articles, as that value is arguably test data, not a design variable.

## RE: NACA Airfoild 6 serie nomenclature

## RE: NACA Airfoild 6 serie nomenclature

Comprehension is not understanding. Understanding is not wisdom. And it is wisdom that gives us the ability to apply what we know, to our real world situations

## RE: NACA Airfoild 6 serie nomenclature

## RE: NACA Airfoild 6 serie nomenclature

6 The series.

4 The area of minimum pressure is 40% of the chord length back from the leading edge.

(9.5) It maintains low drag .9 above and .5 below the left coefficent which is not listed. (or it could mean .95 above and below?)

8 Would this be the thickness as in 8% which should have a leading zero to make the 2 digits it's supposed to have?

Kirby Wilkerson

Remember, first define the problem, then solve it.

## RE: NACA Airfoild 6 serie nomenclature

## RE: NACA Airfoild 6 serie nomenclature

I came up witht the same interpretation

thank you