For a bare wing, where does the Center of Drag fall with respect to the Center of Pressure?
Now THAT is why you cut the Flaps Down .
![Grin ;D](https://stunthanger.com/smf/Smileys/classic/grin.gif)
( took me two hours and a stroll in the chill outdoors for a smart assed answer to come to me , sorry
![Smiley :)](https://stunthanger.com/smf/Smileys/classic/smiley.gif)
)
If by BARE ' WE ' mean flapless , perhaps theyd be pretty much co-incident . .
![Grin ;D](https://stunthanger.com/smf/Smileys/classic/grin.gif)
Assuming its ' turning ' . ( 'Turning' in relationship being control line , pretty save to assume in the Vertical )
BUT , ( Jaws Theme ) ,
On a Flapped ship , theyred be THREE pretty much ' stable ' conditions , mid level flight , mid round , & Mid Square Turn . With Transitions to evaluate between .
![Angry >:(](https://stunthanger.com/smf/Smileys/classic/angry.gif)
A bit of work * )
* std aussie expressions , That sounds like a bit of work . I think I'll Have a Beer . Id Better ask the Missus .
The Forces magnitude I would assume , would vary in multiples , one to the other . NOT the Aussie ONES !
![Layingdown LL~](https://stunthanger.com/smf/Smileys/classic/side_laugh.gif)
.
![Embarrassed :-[](https://stunthanger.com/smf/Smileys/classic/embarrassed.gif)
BACK to the Question , the variation one would pressume would be in vectors of load & angle from the Empenage / rear Stabilizer . But unlikly to be outside 3/4 in variance. More Likely 1/2.
Less on these modern Blunt Aifoils .
Unless its a Sky Dancer .
![](http://library.modelaviation.com/system/files/styles/zoom1800/private/ma/ma199412/ma199412_124.jpg?itok=csZ0GdIF)
Id expect these flat reflex airfoils to have a less transitory * C. P. & C. of L. and softer flap action in the open ( Round ) manouvers ,
![Tongue :P](https://stunthanger.com/smf/Smileys/classic/tongue.gif)
( * less Transition OF . )
A sharp L E Plate Wing start acting like a Ridgid Sheet ( hopefully . if it acted like a sheet of cardboard , it'd have to be top of the line , or itd fold back ). So Sheet of Plywood
is likely the analogy . As you didnt specify the airfoil .
![Evil >:D](https://stunthanger.com/smf/Smileys/classic/evil.gif)
If being a flat sheet , the airflow had broken off from the L E at the top , assuming a incidance , say 10 on up . Getting Steeper center of pressure would tend toward the center ,
And the Wake Behind would assume aft , at 50 % efficiecy that might be up 5 Deg, and likely Fwd of center a way . Thered likely even be reverse airflow fwd up over the rear surface .
SO , if we introduced a Airfoil , It'd Vary . But the Pointier ( than these new ones ) Old N A S A series , in say a 20 % if were agreeable to a " Standard ' , dosnt stall Easilly ,
So the C L will be aft of 20 % Chord . While the C D is likely Fwd of 30 % chord . If its not acting like a sheet of Plywood . Bob Hunt could put somme foam on it tho .
![Evil >:D](https://stunthanger.com/smf/Smileys/classic/evil.gif)
Bobs Airfoils have been traditionally very N A C A ish , in entry , curve , etc . If not exactitude ( To N A S A ) , which I havnt checked as I hadnt considered the might , try to .
But the FLAPS are the Crux of the matter , for F2b / P.A. , unless somebody left them OFF two thirds of the Wing , and gave N A S A considerations more than a passing glance .
Note Beringer ; naff all Flap , the Flat Egress of the Sky Dancer , but the Modern Entry : that more applicable to Rate of Roll than Vertical Turn Rate , unless Im Mistaken .& with a 2:1 Taper Ratio
So While Some flap is usefull , almost as a force divergance to induce stability in turns , If we ARE talking FLAPS , the Ultimate Extreme would be a Variable Incedance Wing . Whoops .
This might require hydraulics, electrickery , or pnematics . Unless you can think of something else . ( Well Get IGOR on to it .
![Stir the pot S?P](https://stunthanger.com/smf/Smileys/classic/stirpot.gif)
) Structurally itd be simple . And should turn good .
![Devil VD~](https://stunthanger.com/smf/Smileys/classic/icon_120.gif)
A Double Action Crusader
![Wink ;)](https://stunthanger.com/smf/Smileys/classic/wink.gif)
. ( Just a carbon Heli Boom Spar , a few washers & Circlips and a few other things .
if it was Neutral, Plus Two Positive & Two Negative settings , It'd likely be simplist .
AND we could aim for 3 Ft Radius SQUARE CORNERS .
![Layingdown LL~](https://stunthanger.com/smf/Smileys/classic/side_laugh.gif)
Dead Serious Tho .
![Angry >:(](https://stunthanger.com/smf/Smileys/classic/angry.gif)