Mark
seriously sir, I sincerely appreciate the time it took to craft the response
I think some should understand I am NOT a math wiz, nor an aero engineer, or in any way considering experimenting with airfoil shapes
So I have to ask...considering the hundreds of proven designs, aspect ratios, moments, relative distance and empennage size ratios, designed engine, power, and moment, gyroscopic precession, etc etf
So other that designing some new airplane why is any of this necessary other than as a mental exercise?
OK I re-read this before posting and have to admit...many things are worth the mental and curiosity exercise...
Does it count that I found the Dick Mathis or Howard Rush airfoil real good and used it to make my own bastard aircraft?
well, there are many articles from the past that reference using the side of a shoe to draft the airfoil.
that said, if you know how to do this, then you can accuratly translate my 700 square inch airfoil to your 500 square inch airfoil and get the proper plot.
is that what you always want? not as a strict rule, there are a lot of other factors.
My simple answer, meant respectfully , if you do not know how to perform this, than the airfoil data associated with accuratly lofting ribs is probably wasted on you and you would be better to take someones design, copy ALL the relevant datum points, and change the shape of the rudder, wing tips, and elevator/stab tip shapes but leave everythign else the same.
a stunt airplane is a SYSTEM of *hopefully* carefully selected parameters, and changing one parameter can have unanticipated affects on the outcome.
I use an Impact as my basis of design, I change the turtledeck shape, the rudder/vertical shape, wing tips and stab tips, alter the nose length slightly because I tend to build and finish a bit tail heavy, so I lengthen the nose ever so slightly and poof there is my "design"