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        Question difference between s3021 & sd3021?

#1 skorski Dec 29, 2005 08:52 PM

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!

#2 BMatthews Dec 29, 2005 09:48 PM

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 :D) 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.

#3 skorski Dec 29, 2005 10:13 PM

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...

#4 oakman7004 Jan 10, 2006 02:06 AM

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

#5 Ollie Jan 10, 2006 05:23 AM


There was no SD3012 nor SD3014, ever.

If you want better airfoils see:

#6 skorski Jan 11, 2006 10:24 PM

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.

#7 Lon Enloe Jan 13, 2006 09:09 PM

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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