Which airfoil for me? (using Stefano Duranti's Profili 1.2)  
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All Forums >> RC Airplanes >> Scratch Building, Aircraft Design, 3D/CAD >> Which airfoil for me? (using Stefano Duranti's Profili 1.2)
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Which airfoil for me? (using Stefano Duranti's Profili ... - 3/26/2002 8:37:58 AM   
Someone11-RCU



Posts: 394
Joined: 2/3/2002
From: Fresno, CA, USA
Status: offline 		Which airfoil design is the best for an aerobatic/sport glow airplane? It has a low-wing design and a 60in. wing span. Which airfoil should I use in Stefano Duranti's Profili 1.2? (I downloaded this program, and don't know which one to choose out of the 1800 choices.)


Thanks-Brian

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Which airfoil for me? (using Stefano Duranti's Profili ... - 3/26/2002 9:27:12 PM   
erwinf


 

Posts: 29
Joined: 3/24/2002
From: Sucat Paranaque Philippines
Status: offline 		You can try this:

S8035 for RC aerobatic 14% thick

I haven't personally tried it but the name says it's for RC aerobatic.

Hope this helps.

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       Post #: 2

Go for a NACA 0012 - 3/26/2002 10:28:00 PM   
wled123


 

Posts: 55
Joined: 3/20/2002
From: VIRGINIA, VA, USA
Status: offline 		Don't waste your time on those fancy airfoils. Without going into airfoil theory, L/D curves and Reynolds numbers, go for a standard symmetrical airfoil with about a 12% to 15% thickness ratio, hence a NACA 0012 thru NACA 0015. Easy to cut a foam core or build up from ribs/caps. If you are looking for something easy to stall (i.e. snap roll), go with the thinner airfoil and sharpen the leading edge, you pay for it with higher stall speeds. For good landing characteristics (i.e. GP Ultrasports), go with the thicker airfoil and nice blunt/round leading edges. Something else that is typically done is go with a 12% at the root and 15% at the tip to prevent tip stalling. And then there is washout, but don't worry about that for now.

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Which airfoil for me? (using Stefano Duranti's Profili ... - 3/27/2002 1:01:12 AM   
Someone11-RCU



Posts: 394
Joined: 2/3/2002
From: Fresno, CA, USA
Status: offline 		Would a wing with 12% at the root, and 15% at the tip be good at aerbatics and getting around?

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       Post #: 4

Which airfoil for me? (using Stefano Duranti's Profili ... - 3/27/2002 1:21:05 AM   
Someone11-RCU



Posts: 394
Joined: 2/3/2002
From: Fresno, CA, USA
Status: offline 		This is my current airfoil. I decided on this one before this forum.

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       Post #: 5

Which airfoil for me? (using Stefano Duranti's Profili ... - 3/27/2002 5:37:07 AM   
uproar_15



Posts: 196
Joined: 12/28/2001
From: Daytona Beach, FL, USA
Status: offline 		Looks like the S8035 14% from Profili. i am using that on my aerobatic design. having Flying Foam cut my cores.


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Rob O'

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       Post #: 6

Which airfoil for me? (using Stefano Duranti's Profili ... - 3/27/2002 7:26:49 AM   
Someone11-RCU



Posts: 394
Joined: 2/3/2002
From: Fresno, CA, USA
Status: offline 		Actually it is the first one; It is 12% JOUKOWSKI. I might go with the NACA 12% as root, and NACA 15% as tip, but I don't know if this would be good for sport flying and aerobatics.

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       Post #: 7

Which airfoil for me? (using Stefano Duranti's Profili ... - 3/27/2002 7:50:43 AM   
MiL



Posts: 281
Joined: 1/22/2002
From: Bend, OR, USA
Status: offline 		what about Airfoils for funfly planes?

My first design/scratch project is a profile Funfly for a .25 bushing motor i've got. I just cut the ribs the other night, I used Profili to generate a NACA 0018 and then modified it by moving the "fat" part a little farther forward (which also made the LE a little more blunt).

Here's a pic that shows the shape of the fuse and the airfoil.

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Which airfoil for me? (using Stefano Duranti's Profili ... - 3/27/2002 8:34:26 AM   
Someone11-RCU



Posts: 394
Joined: 2/3/2002
From: Fresno, CA, USA
Status: offline 		Cool design!

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       Post #: 9

Which airfoil for me? (using Stefano Duranti's Profili ... - 3/27/2002 10:54:32 AM   
can773



Posts: 1663
Joined: 1/25/2002
From: Calgary, AB, CANADA
Status: offline 		[QUOTE]Originally posted by Someone11
Would a wing with 12% at the root, and 15% at the tip be good at aerbatics and getting around? [/QUOTE]


This is becoming mainstream on all high end pattern models, not that thick (11 root 12 tip or 12 root 13 tip). The general idea is for snap recovery, in order to help prevent over rotation after a violent snap. Use that with around a 33%-35% high point and you will be ok. Also running the ailerons and elevator straight off the end of the wing will improve snap performance.


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Chad Northeast

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       Post #: 10

My new airfoil - 3/27/2002 11:25:44 AM   
Someone11-RCU



Posts: 394
Joined: 2/3/2002
From: Fresno, CA, USA
Status: offline 		I desided to go with a NACA12% root, and NACA 15% tip. Here is what it looks like:

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       Post #: 11

Which airfoil for me? (using Stefano Duranti's Profili ... - 4/2/2002 6:29:59 AM   
CrazyHerb-RCU-delete



Posts: 391
Joined: 3/13/2002
From: CA
Status: offline 		Hey MiL!!
Got any dxf drawings of that profile?
I like the looks of that profile....BIG rudder!!

And I happen to just have a OS .25 sitting right here next to me!!

If you build it let us know how it goes!!

High Flights!!
CrazyHerb

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       Post #: 12

Which airfoil for me? (using Stefano Duranti's Profili ... - 4/2/2002 7:18:41 AM   
MiL



Posts: 281
Joined: 1/22/2002
From: Bend, OR, USA
Status: offline 		I'll try to get a picture up pretty soon. When i drew it up, i didnt put much thought into mounting the radio components and stuff so it's been kind of slow building trying to figure out how to make it all work. And of course i've run into several small problems that i didn't think about untill i saw it in physical form in front of me. Hopefully will be flying before too long though. School has started and that will also slow me a little. I will definitely make a post when there is progress though.

I'm not too proud of my .dwg right now (it's kinda like my workshop, messy with a few different projects going on) but i guess i don't have to show off or anything so i'll go ahead and send you a copy if you'd like. Let me know your preferred email for recieving attachments.

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       Post #: 13

Which airfoil for me? (using Stefano Duranti's Profili ... - 4/3/2002 8:18:25 AM   
Someone11-RCU



Posts: 394
Joined: 2/3/2002
From: Fresno, CA, USA
Status: offline 		[QUOTE]Originally posted by can773



This is becoming mainstream on all high end pattern models, not that thick (11 root 12 tip or 12 root 13 tip). The general idea is for snap recovery, in order to help prevent over rotation after a violent snap. Use that with around a 33%-35% high point and you will be ok. Also running the ailerons and elevator straight off the end of the wing will improve snap performance. [/QUOTE]

I'm not designing my plane for pattern flying though. I want my plane to be more aerobatic. With my selected wing thicknesses (12% root, 15% tip) would it still be adequate for aerboatics/sport? I'm fairly new to this hobby and dont know if there is a big difference between pattern and aerobatic wings, so I'm sorry if I'm making any of of frustrated by having to explain this stuff to a "newb" like me I appreciate all of your replys and views!

Thanks for your time - Brian

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Which airfoil for me? (using Stefano Duranti's Profili ... - 4/4/2002 7:16:01 AM   
MiL



Posts: 281
Joined: 1/22/2002
From: Bend, OR, USA
Status: offline 		For CrazyHerb and anyone else intersted, here is a link to a thread in the Fun Fly forum where there is a picture of my plane and more info about it.

http://www.rcuniverse.com/forum/tm.asp?m=85374

MiLL

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       Post #: 15

Airfoil performance - 4/4/2002 7:27:49 AM   
Mike James



Posts: 2464
Joined: 1/19/2002
From: Anchorage, AK, USA
Status: offline 		You can get as technical as you want on this subject, but a general rule, when dicussing the symmetrical airfoils (above) with 9 to 15 percent thickness, is that if 14 percent is about typical for Pattern (i.e., an Eppler 168) then the slightly thicker sections you've selected will allow for slower flight and landings, due to their greater drag.

With a medium size sport plane, you won't see huge dramatic differences in these airfoils. (Of course, that's assuming your area and aspect ratio is also fairly typical.)