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Tabular format of coefficent of lift and drag at multiple attack angle
4

Tabular format of coefficent of lift and drag at multiple attack angle

Tabular format of coefficent of lift and drag at multiple attack angle

(OP)
Hi Colleagues.

Does any-one have tabular format for approximate engineering solution for the coefficient of lift and the coefficient of drag forces at multiple attack agles (e.g. 0 (0, 20, 30, 50, 70 and 90 degrees) for a range of wind speeds 50, 100, 150 and 200 km/h applicable to any chord and length (Thickness approximately 3 mm , CS).

I am NOT looking for drag or lift equations or approximate numbers such as Cd = 0.4 which does not cover my specified question.

A side question - These numbers are usually measured experimentally - but if they can be calculated theretically for a finite element I would be interested as well.

Thanks in advance.
 

RE: Tabular format of coefficent of lift and drag at multiple attack angle

What's the point of getting actual data if there is little bearing on your actual design?

TTFN

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RE: Tabular format of coefficent of lift and drag at multiple attack angle

4
I don't normally write this sort of response as it takes time, is only semi-productive, semi-direct, and semi-positive, and can generate a lot of flames.  I haven't made a response like this on Eng-Tips before.  However, it's a slow morning, I've wrapped up that FMEA document, and I'm feeling even more verbose that usual  :)  , so here goes.  I hope that it is taken in the tounge-in-cheek manner that it is given!

Before visiting a foreign country, wise travelers always learn a few words of the language first.  They'll buy a phrase book and spend some moments committing to memory the basic, commonly required words and definitely learning a couple of simple phrases.  The locals in the country usually appreciate the effort that a such a stranger makes and somehow, for these visitors, doors open a little more readily when they request assistance and they tend to get the exact help that they desire.

Other travelers, perhaps because of schedule pressure or unexpected, sudden requirements, do not have time to learn the rudiments of the language.  They might even ask questions along the lines of "I can't be bothered to properly phrase my question properly.  I can't be bothered to even look for the most basic answers myself.  Just give me what it is that I want.  Free of charge.  And don't bother me with trivia like theory.  Oh, and here's a list of things that I do NOT want, and I especially do not want anything that is not directly and immediately applicable to my specific wish."  Such travelers tend to find to their disappointment that hotels are fully booked and the staff do not know of another hotel that might have a room free, restaurants do not have an available table and the staff are not sure of where there might be another restaurant to try, and the local citizens do not seem to know the way to the traveler's destination when asked.

I have a list of phase books that sometimes help me to avoid such situations.  Most of the books I paid for, but a few are freely available and I have listed some of these below.  Maybe you will find these useful, maybe not, but I hope that you do.  As with all free information, it is your responsibility to decide whether or not it is applicable to your situation.

==> Lift Curve Slope

http://www.aerospaceweb.org/question/aerodynamics/q0136.shtml

==> Non-Dimensional Drag Versus Lift Data

http://ntrs.nasa.gov/search.jsp?R=891262&id=4&as=false&or=false&qs=Ntt%3Dairfoil%2Bdata%26Ntk%3Dall%26Ntx%3Dmode%2Bmatchall%26Ns%3DHarvestDate%257c1%26N%3D0

==> Ifs and Buts

http://www.zenithair.com/kit-data/ht-87-5.html
http://www.desktopaero.com/appliedaero/airfoils2/LowReSections.html
http://en.wikipedia.org/wiki/Stall_(flight)
http://www.erau.edu/er/newsmedia/articles/wp3.html

==> I Want A Black Box Free Of Cognitive Input (Apologies to those Xfoil & Javafoil users who, in fact, supply a lot of cognitive input and for whom these programs are not black boxes.)

http://web.mit.edu/drela/Public/web/xfoil/
http://www.mh-aerotools.de/airfoils/javafoil.htm¶;

==> And I want You To Tell Me How To Use It

This is a list of phrase books, not a discourse on grammar.

==> Consequences Of Slap-Dash Work Or Ignorance

http://www.ima.umn.edu/~arnold/disasters/sleipner.html
 

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