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Old Dec 29, 2005, 09:52 PM
No conspiracy in theory
skorski's Avatar
Oak Ridge, Tenn.
Joined Aug 2004
3,648 Posts
Question
difference between s3021 & sd3021?

I.m looking for the plots for the sd3021 & sd3014 airfoils, but I can only find the s3021 & s3014 plots.
Whats the difference? Anybody got a clue?
Thanks in advance!
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Old Dec 29, 2005, 10:48 PM
B for Bruce
BMatthews's Avatar
The 'Wack, BC, Canada
Joined Oct 2002
11,602 Posts
They are the same. Selig included his partner's initial along with his own for different series of airfoils. SD stands for Michael Selig and John Donovan. SA is another series but I don't remember who the A was for at this point (old age and all that ) The number is the important part. The letters are just an error one way or the other. The 3021 and 3014 are detailed in Soartech 8, which I just happen to have at hand, and are listed with just the S. Michael may have added the D to this early series later on or it may only be a mistake that you picked up.
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Old Dec 29, 2005, 11:13 PM
No conspiracy in theory
skorski's Avatar
Oak Ridge, Tenn.
Joined Aug 2004
3,648 Posts
Thanks for the quick reply Bruce.
Now if I can just remember why I was looking at them!
Probably had something to do with sailplanes. Oh Yeah...
BuildCrashFly & Fly More! Mike...
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Old Jan 10, 2006, 03:06 AM
Team WC2013 F3K
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Sweden
Joined Dec 2004
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SA stands for Michael Selig / Ashok Gopalarathnam...

Skorski, The S3021 & s3014 are ecxellent airfoils for a 2-2,5 m RES glider (or fullhouse). Often overlooked buy SD7037 or SA7035-36...Mabye that the new build thread, and why you searched for the foils?

/Jonas Ekman
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Old Jan 10, 2006, 06:23 AM
Registered User
Punta Gorda, FL
Joined Apr 2002
4,952 Posts
S3012
http://www.nasg.com/afdb/show-airfoil-e.phtml?id=1036
S3014
http://www.nasg.com/afdb/show-airfoil-e.phtml?id=1034

There was no SD3012 nor SD3014, ever.

If you want better airfoils see:
http://www.charlesriverrc.org/articl...t-airfoils.htm
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Old Jan 11, 2006, 11:24 PM
No conspiracy in theory
skorski's Avatar
Oak Ridge, Tenn.
Joined Aug 2004
3,648 Posts
Thanks folks,
I'll follow those threads Ollie. Oakman, thanks for pointing out they're for that span range it reminded me why I was searching that info! Great job guys!
NowGoFlyAndFlySomeMore! Have fun & many thermals. imouttahere! Mike.
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Old Jan 13, 2006, 10:09 PM
Registered User
Colorado Springs, CO
Joined Oct 2004
731 Posts
I used a 3021 on a low-wing scale ship--it flew nicely once I got enough thrust-to-weight under its belt.
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