difference between s3021 & sd3021? - RC Groups
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Dec 29, 2005, 09:52 PM
No conspiracy in theory
skorski's Avatar

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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Dec 29, 2005, 10:48 PM
B for Bruce
BMatthews's Avatar
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.
Dec 29, 2005, 11:13 PM
No conspiracy in theory
skorski's Avatar
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...
Jan 10, 2006, 03:06 AM
Team WC2013 F3K
oakman7004's Avatar
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
Jan 10, 2006, 06:23 AM
Registered User

There was no SD3012 nor SD3014, ever.

If you want better airfoils see:
Jan 11, 2006, 11:24 PM
No conspiracy in theory
skorski's Avatar
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.
Jan 13, 2006, 10:09 PM
Registered User
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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