Techniques > Misc
HQ35/12 Airfoil
Alan_Perse:
OK we need to make somthing clear first, this may be a long post :D :D . The camber of a wing is the maxium distance between the camber line and the chord line ( the red and blue lines on the diagram on the prevoius page). It is not the curvature of the top and bottom surfaces of the wing, although the curvature of the top and bottom surfaces of the wing effect the shape of the camber line.
And here's a spanner in the works :) , wings that have camber can creat lift at small negative angles of incidence. The reason a symetrical wing creats no thift at 0 degrees incidence is because it has no camber. The top and bottom surfaces of the wing have the same shape, thus the camber line is in the same position as the chord line. As a result there is no distance between them thus no camber.
If your wondering why i know so much its because I have two or three books on aerodynamics to look at :D . But I'm not an expert, its the books that are talking :D :D . One of them is called "Model Aircraft Aerodynamics" by Marin Simons, its very good book.
IceWind:
Alan that seems a good reading!
Thanks for sharing. :)
I still prefer to read real books than be reading from the web...
Alan_Perse:
--- Quote from: "IceWind" ---I still prefer to read real books than be reading from the web...
--- End quote ---
I agree
Happy Days:
Yes,..........I think I agree with Alan in that probably the best thing for me is to go back to basics. :roll:
At the moment as soon as I hear one answer, my brain, (what there is of it) pops up another question.
The problem with understanding lift is that there seems to be no black and white answers. The 'goal posts' are not fixed
Think I'll click on Amazon Books and order a copy of that "Model aircraft Aerodynamics"
As I remember it,..................... "Pi multiplied by R squared over 4', ................ take away the number you first thought of!! "
Hmmmm, this could take a bit of time :?:
IceWind:
Well, compelled by the curiosity i went to Amazon... and yes i bought the book.
There is much info out there i still need to learn. :)
I dont wanna be around RTF's and ARTF's forever!!!
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