# rudder nasa foil sect

Discussion in 'Boatbuilding' started by ten thou .010, Aug 21, 2008.

1. Joined: Aug 2008
Posts: 3
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Location: bremerhaven

### ten thou .010New Member

lost my book, can anyone point me to nasa foil sections, thanks
chord 500mm
span 750mm
stock 63.5mm at balance axis
nice place this

2. ### Guest625101138Previous Member

Look here:
Scroll down to NACA and choose your poison. You can get a coordinate file or gif image of the nominated sections.

It seems you are indicating it is 63.5+mm thick and 500mm chord. That is just over 12% so I suppose you are looking for a NACA0015.

3. Joined: Aug 2008
Posts: 3
Likes: 0, Points: 0
Location: bremerhaven

### ten thou .010New Member

danki
but the GIF FILE, brings up an air wing section?

4. ### lazeyjackGuest

(1) The values listed beneath the NACA numbers are the distances + and - to the foil surface from the centerline in % of chord.

(2) Cut values for 0012 and 0018 in half to get 0006 and 0009. Double 0015 to get 0030. Halve 0006 to get 0003.

(3) It's conventional to make the chord 5% longer than you really want, and then slice off the last 5% to a blunt edge after laying out the foil profile. Example: you want a 20-inch chord rudder. Calculate profile based on 21 inches, leaving off last 5% or 1-inch when laying out.

(4) The nose of a NACA 00-- foil is always circular. Fair this in by eye as best you can using a compass or template or some sort (bottom of McDonald's coffee cup). This radius can be generated by the formula referred to above. (I'm still not talking.)

(5) The thickness of a NACA foil is always greatest at 30% of the chord from the nose.

Distance
From Nose NACA
0012 NACA
0015 NACA
0018 NACA
0021 NACA
0025 NACA
0030

1.25 1.89 2.37 2.84 3.31 3.95 see note 2
2.50 2.62 3.27 3.92 4.58 5.45 ----
5.00 3.56 4.44 5.33 6.22 7.41 ----
7.50 4.20 5.25 6.30 7.35 8.75 ----
10.00 4.68 5.85 7.02 8.20 9.76 ----
15.00 5.34 6.68 8.02 9.35 11.14 ----
20.00 5.74 7.17 8.61 10.04 11.95 ----
30.00 6.00 7.50 9.00 10.50 12.50 see note 5
40.00 5.80 7.25 8.70 10.16 12.09 ----
50.00 5.29 6.62 7.94 9.26 11.03 ----
60.00 4.56 5.70 6.84 7.99 9.51 ----
70.00 3.66 4.58 5.50 6.41 7.63 ----
80.00 2.62 3.28 3.94 4.59 5.46 ----
90.00 1.45 1.81 2.17 2.53 3.02 ----
95.00 0.81 1.01 1.21 1.41 1.68 ----
100.00 0.13 0.16 0.19 0.22 0.26 ----

All Measurements in Percent of Chord

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