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Old Jun 30, 2008, 10:04 AM
Registered User
Houston, Tx.
Joined Jan 2003
3,668 Posts
Question
SFG's

Do SFG's need to extend all the way to the end of the ailerons to be effective?
Would they be effective if they only extended to the back of the wing, not to the back of the aileron?
Thanks for any suggestions....
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Old Jun 30, 2008, 10:07 AM
Extremely Twisted
cwojcik's Avatar
United States, NH, Epping
Joined Oct 2005
2,630 Posts
The larger they are, the more effective they will be. They don't need to extend to the aileron to be effective.
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Old Jun 30, 2008, 10:42 AM
Aerodynamically challenged
3Deranged's Avatar
3D World, Florida
Joined May 2005
3,182 Posts
What plane are we talking about here? Depends on the plane from my experience. Takes a lot of expermenting to get the size/position/shape and number of SFG's correct.
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Old Jun 30, 2008, 10:48 AM
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Houston, Tx.
Joined Jan 2003
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It's a varation of this ... http://www.rcgroups.com/forums/showthread.php?t=885655
I made the wing symetrical instead of a KF step.
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Old Jun 30, 2008, 11:53 AM
Aerodynamically challenged
3Deranged's Avatar
3D World, Florida
Joined May 2005
3,182 Posts
Unfortunately there's no set rules for SFG's. You'll have to experiment and see what works best. Start out on the end of the wings and be prepared to make changes after testing. Sometimes hot glue in small amounts will hold it on while you test and then you can remove SFG and rub/roll off hot glue dobs. Then repeat with different sized SFG and see how that one works. Thin airfoils seem to get the nod lately for better penetration and transitions from high alpha to level flight. My 2 cents...
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Old Jun 30, 2008, 12:33 PM
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Houston, Tx.
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Thanks Ed !!
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Old Jun 30, 2008, 01:40 PM
Aerodynamically challenged
3Deranged's Avatar
3D World, Florida
Joined May 2005
3,182 Posts
My middle name is Edward but Jason will do! Initials spell JET EDFrules is just a screen name I started with(into jets first, what can I say). Have fun and keep em' flyin'!

Jason
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Old Jun 30, 2008, 02:16 PM
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Houston, Tx.
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Ooops sorry Edward...I mean Jason
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Old Jun 30, 2008, 02:48 PM
VBARRRR
brian94066's Avatar
USA, CA, San Bruno
Joined Jul 2007
2,502 Posts
for me, i like to have the SFGs 2-3 inches from the tips on 35-45" span models

and the SFGs will be the size of an iPod touch, not as thick, but the length and width will be similar

i also like the SFGs pointing outwards on the wing, at about 10 degrees

helps with knife edge and slow flight
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Old Jun 30, 2008, 03:08 PM
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Houston, Tx.
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Darn, looks like I need to buy a new Ipod
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Old Jun 30, 2008, 03:12 PM
Registered User
Houston, Tx.
Joined Jan 2003
3,668 Posts
Thanks for the comments guys.
I think I'll try an oval one first. I'm more concerned with the look, but any good flight characteristic added will be a bonus.
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Old Jun 30, 2008, 03:42 PM
VBARRRR
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USA, CA, San Bruno
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the ipod touch is so worth the money
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Old Jun 30, 2008, 03:56 PM
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Houston, Tx.
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Yeah, I guy here at work has one... they are pretty cool.
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Old Jun 30, 2008, 04:41 PM
Build 2 Bounce!
Birmingham, UK
Joined Jul 2006
1,660 Posts
Bill, SFG's are even proving useful in Giant Scale aerobatics at the moment. Manuel Santos modified his 121"ws Dalton and used them recently at XFC. Even the big gassers are starting to look like foamies lately
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