Pattern wing design

[randy10926 at comcast.net]

Anyone know what wing the KAOS and Prophecy uses.  I recently got a Kaos kit 
and the plans for a KOAS 90.  Thinking to building a Kaos 90 with Prophecy 
wings.  I would like to use one of the wing programs to generate a balsa built 
up wing.  For some reason I would like to really build something.

Randy
> Buddy,
> "Eagle One"? I liked Viagara better.  Of course, with carbon fiber 
> reinforcement, that may be a bitof an exaggeration.
> 
> Your wing question is not a simple one.  There are many many variables in a wing 
> and the effect of each variable is debatable, even with wind tunnel tests.  Our 
> planes demand uniform performance but very little lift.  they fly at slow speeds 
> (low Reynolds numbers) and they must handle equally well inverted.  There is not 
> much research in this area.  Even airfoil design software, like profoil, is of 
> limited help.  
>   This may elicit controversy, but the most important thing in a pattern wing is 
> planform, given the obvious requirement for a symmetrical airfoil.  The airfoil 
> is important, but less so in our application since we are limited to symmetrical 
> airfois and we have very little lift requirements. 
>   You need to start with a goal and then make tradeoffs to achieve that goal.  
> Most people don't want to wade into these variables and test new wing designs.  
> That's why most planes on the market are Prophecy wings with a different shaped 
> fuse.  Our Entropy made slight mods to the wing,but this is essentially what it 
> is.  The Aries, on the other hand, is the product of a different lineage of 
> development with different goals.  It is an "unconventional" shape: large root 
> chord, large sweep back, small tip.  The larger root increases the drag closer 
> to the CG for speed control and stability.  This also moves the center of lift 
> closer to the fuse.  Along with the small 9 1/4" tip chord this helps the tips 
> initate a snap.  This is necessary to conteract the large wing area - which is 
> there to maintain extra stability at low speed or high alpha.  In comparison to 
> the pattern standard wing, it rolls better and flies slower.
>    You want to understand thse variables more?  A good website is 
> http://www.aae.uiuc.edu/m-selig/ at the U of I.  There are lots of others.  Good 
> airfoil performance plots are not available for free anywhere I know of (anyone 
> should fee free to correct me on this point) so you''ll have to buy a good 
> plotting program to nail it. You can have different airfoils at the root and tip 
> to blend characteristics.
>   Dihedral is related to wing position relative to the vertical CG and its 
> relation to the stab is super critical.  Don't ignor the stab airfoils either. 
> They can actually affect CG position too.
> --Lance
> 
>   ----- Original Message ----- 
>   From: BUDDYonRC at aol.com 
>   To: discussion at nsrca.org 
>   Sent: Wednesday, September 03, 2003 11:43 AM
>   Subject: Pattern wing design
> 
> 
> 
>   I am in the final stages of production on my new "Eagle One" design which is a 
> revised fiberglass fuse.  Version of my "Mirage" ( Changed the name for obvious 
> reasons) .
>   The first Fuselage is out of the mold and I am looking at possible revisions 
> to the wings but unfortunately I am wing stupid.   
>   If there is anyone out there that will provide some insight on the subject it 
> will be appreciated.
>   1. Airfoil? Shape and type with advantages and disadvantages of those 
> currently used on pattern planes  
>   2. Plan size and shape? Single tapered and double tapered and why?
>   3.  Airfoil thickness and taper? Equal percentage or higher percentage taper 
> and why?
>   4. More sweep or less sweep? (expected effect)
>   5. Dihedral? Expected effects.
>   What are the best being used currently? Why?
>   I am currently using a Laminar airfoil 2- 1/8" Max thickness (11.5%), 19" wide 
> at the root and 9" wide at the tip double tapered with a leading edge sweep of 
> 15 degrees and a trailing edge taper of 2-1/2 degrees plan form with equal 
> percentage thickness, 34" long and 7 degrees dihedral.
>   The airplane fly's good with some small flight imperfections that I think a 
> revision to wing design may correct.  I just want to make sure that I understand 
> what the expected results of any changes will be before I proceed
>   Any and all help will be appreciated.
>   Buddy  
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