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Old Jun 01, 2012, 06:37 PM
AB-AIRFOIL
Joined Jun 2012
46 Posts
Discussion
New airfoils

Hi,
I'm Andrea,
a RC glider pilot in the Dolomites in Italy,

there are new series of airfoils (AB-AIRFOIL) and other,

online since 2012, available FREE of charge
for private use
I created in ~1.5 years of work, and 30 years of slope soaring

the site is still under construction but the contents are available.


http://airfoils.eu
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Old Jun 05, 2012, 12:17 AM
Registered User
United States, OR, Tualatin
Joined Apr 2005
2,669 Posts
Very impressive; you have done a lot of work. Any models flying with your airfoils?
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Old Jun 06, 2012, 09:07 AM
AB-AIRFOIL
Joined Jun 2012
46 Posts
Not yet, 's all new and made ​​available online a few months.
I have 2 models under construction, Swift from 3.3m almost finished and a Fox by 4m.

http://airfoils.eu
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Old Jun 06, 2012, 01:19 PM
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Woodstock 1's Avatar
Ireland, County Kerry, Kerry
Joined Dec 2005
6,987 Posts
Most impressive work!

I think I understand that you have a view that a scale Swift should have flaps. I couldn't agree more! There are in my opinion limits to this whole scale fidelity business, and if I was build build another Fox or a Swift, flaps are a definite !

Chris
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Old Jun 06, 2012, 03:53 PM
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Mr. Combat Certain's Avatar
United States, CA, San Clemente
Joined Feb 2008
3,327 Posts
So what airfoils could be used for certain applications, such as light wind floaters or fast lead sleds? How do they compare to more traditional sections such as the RG series?
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Old Jun 07, 2012, 05:32 PM
AB-AIRFOIL
Joined Jun 2012
46 Posts
Quote:
Originally Posted by Woodstock 1 View Post
Most impressive work!

flaps are a definite !

Chris
Sure, increase the lift or reduce the drag, when needed, even at the expense of efficiency, is a key for better performance.

http://airfoils.eu
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Old Jun 07, 2012, 06:12 PM
AB-AIRFOIL
Joined Jun 2012
46 Posts
Quote:
Originally Posted by orni-freak View Post
So what airfoils could be used for certain applications, such as light wind floaters or fast lead sleds? How do they compare to more traditional sections such as the RG series?
your question is not easy to answer but the answer is: polar dynamics.
with it you know what is best to do and what not to do, in relation to a specific configuration model.

For example on my site you can compare the dynamics polars P12-60 and P12-61 on the fox 2.8m, where the only difference is the weight and consequently varies the wing loading (load variation AB239-1.75).

If you do not have available polar dynamics, very rare I think, you can compare the airfoils through the absolute or experimental polar wind tunnels or virtual wind tunnel, but you must apply the same method.

In all profiles AB I worked to lower the resistance rather than enhance the CL so that the model can run more also, unlike some other profiles, at high NRe.
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Old Jun 07, 2012, 09:54 PM
Will fly for food
davidjensen's Avatar
Bellevue WA,
Joined Dec 2003
7,048 Posts
Was speed your main criteria in designing this new airfoil?
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Old Jun 08, 2012, 05:54 PM
AB-AIRFOIL
Joined Jun 2012
46 Posts
Quote:
Originally Posted by davidjensen View Post
Was speed your main criteria in designing this new airfoil?
No, efficency first and lowering drag second (for now).

Speed for me=fun, no speed no fun

Speed specific airfoils are too little 'acro' ,and barely usable on slope (glider).

Very high speed specific airfoils as DS airfoils are for 500k NRe or more, and barely usable on slope.

Acro specific airfoils have too drag for high speed so for fast fly you must go for heavy wing load and more( great fly sure,but in good condition only)

On site you find 'R' (Racing or Root) airfoils for fast and fast acro,
and not 'R' airfoils for acro.
'fast acro' not same 'acro fast'

http://airfoils.eu
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Old Jun 10, 2012, 06:17 PM
AB-AIRFOIL
Joined Jun 2012
46 Posts
First English version available up&running.

http://airfoils.eu
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Old Jun 16, 2012, 07:00 PM
AB-AIRFOIL
Joined Jun 2012
46 Posts
polars update airfoils AB231R-1.5, AB231R-1.75 and AB231R-2.0

http://airfoils.eu
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Old Jun 25, 2012, 02:27 PM
AB-AIRFOIL
Joined Jun 2012
46 Posts
added airfoils AB334R-1.75 and AB334R-2.0
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Old Jul 07, 2012, 06:29 PM
AB-AIRFOIL
Joined Jun 2012
46 Posts
Added new dynamic polar for Swift 2.6m
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Old Jul 07, 2012, 07:47 PM
gonzalo contreras
gonzalo contrera's Avatar
caracas
Joined Feb 2007
478 Posts
thanks Andrea

Now in my favorites list. and i have 3 projects to some of these.
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Old Jul 29, 2012, 05:03 PM
AB-AIRFOIL
Joined Jun 2012
46 Posts
Quote:
Originally Posted by gonzalo contrera View Post
Now in my favorites list. and i have 3 projects to some of these.
Well done.
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