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Airfoil site - 10/1/2007 9:10:31 PM   
ebreeden


 

Posts: 5
Joined: 11/26/2003
From: Midlothian, VA, USA
Status: offline 		Can anyone recomend a site for NACA airfoil files in cadd or PDF? In particular i am looking for NACA 0015 (15%).
Thanks-
       Post #: 1

RE: Airfoil site - 10/2/2007 12:36:32 AM   
Mike Connor



Posts: 1340
Joined: 1/10/2002
From: Tulsa, OK, USA
Status: offline 		You can download the free Profili 2 airfoil program and then export to DXF format or print.

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Mike
http://www.mikesrc.us/

(in reply to ebreeden)
       Post #: 2

RE: Airfoil site - 10/2/2007 7:19:16 AM   
BMatthews



Posts: 8797
Joined: 10/4/2002
From: Burnaby, BC, CANADA
Status: offline 		.... and it'll generate any NACA profile you need thanks to a little program that calculates the points for you from the 4 digits you fill in.


_____________________________

Bruce-
Proudly wasting balsa since 1965.

Free Flighters go that extra mile........

(in reply to Mike Connor)
       Post #: 3

RE: Airfoil site - 10/2/2007 1:43:04 PM   
ebreeden


 

Posts: 5
Joined: 11/26/2003
From: Midlothian, VA, USA
Status: offline 		Thanks for your help!

(in reply to BMatthews)
       Post #: 4

RE: Airfoil site - 10/16/2007 11:04:21 PM   
propbuster



Posts: 976
Joined: 10/6/2003
From: black mtn, NC, USA
Status: online 		Profili for sure!

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Never run out of Altitude, Airspeed or Ideas all at the same time.
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(in reply to ebreeden)
       Post #: 5

RE: Airfoil site - 10/25/2007 5:06:45 AM   
reaaz



Posts: 358
Joined: 2/12/2003
From: POS, TRINIDAD AND TOBAGO
Status: offline 		here are one of the BEST libraries of airfoils, plus a related site that lists each root & tip airfoil used in what aircraft!
In the airfoil site.. just save the .dat file & rename to .txt so you can import or cut & paste into auto cad etc.. naca 0010.dat rename to naca 0010.txt

http://www.ae.uiuc.edu/m-selig/ads/coord_database.html

http://www.ae.uiuc.edu/m-selig/ads/aircraft.html

(in reply to propbuster)
       Post #: 6

RE: Airfoil site - 11/23/2007 8:09:03 PM   
blkonred


 

Posts: 6
Joined: 1/3/2007
From: Indianola, IA, USA
Status: offline 		Oh man, I wish I would have seen this awesome thread before I scratch built my wing. I am building a replica Air Tractor AT-402, and was having trouble replicating the wing airfoil. I found it on the list, but have a couple of questions. If you look at the NACA 4415 its bottom is not parallel, in other words it looks to me like the airfoil is designed with a tip down incidence........is this correct? If I mount the wing in the plane will the flat bottom be parallel to the horitiontal stab, or should the wing be rotated as shown on the airfoil gif?

Also, is there any "basics" of airfoils websites? I want to know how to intrept what different changes in the foil actually mean to the flying wing, ie one that might have better lift than another shape.....any suggestions?

Paul

(in reply to reaaz)
       Post #: 7

RE: Airfoil site - 11/24/2007 12:00:42 AM   
reaaz



Posts: 358
Joined: 2/12/2003
From: POS, TRINIDAD AND TOBAGO
Status: offline 		The airfoil is shown at 0 degrees incidence line (generally, the line taken from the center of the round airfoil "nose" to the thin aft edge). For RC scale models, you can generally use an incidence angle of 1 deg positive. I would suggest for this model maybe a wing root incidence of 0deg (because this is a high lift airfoil)& tip washout..... That is the wing tip incidence angle should be less than the root by 1 to 2 degrees.. 1 degree less would be okay for your model.. thus 1 deg incidence at the tip.

However there are many reason why not to use full size airfoil in an rc model.. eg relative air density along a wing of such short chords... the low reynolds numbers etc... But I would say that this particular airfoil will fly quite okay on your model.

(in reply to blkonred)
       Post #: 8

RE: Airfoil site - 11/24/2007 12:40:39 AM   
blkonred


 

Posts: 6
Joined: 1/3/2007
From: Indianola, IA, USA
Status: offline 		Man, I have been so engrossed with all of this info, I've spent the afternoon educating myself.

You have a point thouugh, I noticed my chord was slim as comaped to all of my other kit built models. I have access to a full scale air tractor, and have been taking all the measurements off of it and simply dividing by 8. Truth be told thats basically how I came up with the airfoil too.

I used a "sweet purple airplanes" calculator I found on here and calculated some figures on my plane. It looks like the wing loading will be somewhere around 24 oz/sq ft. Also from my calculations it would have a reynolds # of 350,100 @ 50 mph. The calculator site spit out that it would stall at 190,00 and a stall speed of 25.4 mph. I am kind of curious how it came up with that without knowing the air foil???

2 reasons for my curiousity.

#1 I want to try to calculate max gross weight it can carry since I am going to make it functional as a spray plane.

#2 At what incidence should I set the wing.

Before I fouind all of this I was going to set it so that the flat part of the bottoms wing was parallel to the horizontal stab....is this incorrect in this case?

Paul

(in reply to reaaz)
       Post #: 9

RE: Airfoil site - 11/24/2007 1:04:49 AM   
reaaz



Posts: 358
Joined: 2/12/2003
From: POS, TRINIDAD AND TOBAGO
Status: offline 		what site is this aircraft calculat or on??

If you set the angle flat to the bottom of wing I think the model will tend to ballon alot.... Thus i would not recomend it
Max load weight is a function of speed! remeber the saying a brick can fly!

(in reply to blkonred)
       Post #: 10

RE: Airfoil site - 11/24/2007 3:56:54 AM   
blkonred


 

Posts: 6
Joined: 1/3/2007
From: Indianola, IA, USA
Status: offline 		I can't remember where I seen it, but here is a link to it.

calculator site

its pretty cool, I just wish it was english rather than metric.

(in reply to reaaz)
       Post #: 11

RE: Airfoil site - 12/13/2007 11:38:32 PM   
pinky_d_brain


 

Posts: 163
Joined: 10/28/2005
From: Yellowknife, NT, CANADA
Status: offline 		I don’t no if this will help i came across it a wile back never used it or anything but looks interesting
http://www.lerc.nasa.gov/WWW/K-12/FoilSim/index.html

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(in reply to blkonred)
       Post #: 12

RE: Airfoil site - 7/14/2008 7:25:22 PM   
rickswl


 

Posts: 14
Joined: 10/23/2006
From: Estreito, Florianopolis SC, , BRAZIL
Status: offline 		I had a flat bottom wing on my trainer, which got trashed in the garage, and now I would like to make another wing. I would like this wing to be semi-elliptical, or elliptical, but I don't have much practice in designing a wing or knowing much about how to keep from making the wing into a monster. I have read the thread and am now really confused. The cord of the wing I would like to make is 11.5/8" and the wing is 63" long rectangle. wing area is 715 in sq. and the weight is about 5.5 lbs. I have seen other planes at the club with semi elliptical wings and the fly better than the trainer wing. Any suggestions would be greatly appreciated.

Thanks in advance
Larry

(in reply to ebreeden)
       Post #: 13

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