Ash Posted February 20, 2009 Share Posted February 20, 2009 When my physics teacher was showing the class a website on possible EEIs (extended experimental investigation) that we could do for year 12 I must admit that i was quite board until i saw the one on airfoils, this would just be perfect for me i thought. We havent and won't be given the task sheet for a few weeks now but being in grade 12 i thought it best to get started as soon as possible. i have started planing a wind tunnel to test airfoils in but if anyone knows of any website or books that explain the principles of airfoils or any equations used fo calculating lift and the lift coefficentgraph of wings like the clark y on naca airfoils that would be really helpful and much appreciated. thanks Ash Quote Link to comment Share on other sites More sharing options...
Chris C Posted February 20, 2009 Share Posted February 20, 2009 yea i have afew books on rc plane areofoils and pyhics, how can i help :D Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted February 20, 2009 Share Posted February 20, 2009 Try to get hold of Kermode's "The Mechanics of Flight." This is a very old book, pre war, but is so good that it is still in print with updates. It covers all you need to know with the maths you need." Kermode's "Flight without Formulae is the same book without the maths. THat is the one I have. Quote Link to comment Share on other sites More sharing options...
Former Member Posted February 21, 2009 Share Posted February 21, 2009 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Peter Miller Posted February 21, 2009 Share Posted February 21, 2009 I think the book that you want is Martyn Pressnell "Aerofoils for Aeromodellers. Lots of info and lots of pages of assorted airfoils in vaious sizes. Very rare now. I have a copy with one or two pages of airfoils missing. Quote Link to comment Share on other sites More sharing options...
Gemma Jane Posted February 21, 2009 Share Posted February 21, 2009 Ash, to keep to the basic principles, the lift equation and calculation of lift coefficient try here: http://www.grc.nasa.gov/WWW/K-12/airplane/lifteq.html http://www.grc.nasa.gov/WWW/K-12/airplane/liftco.html The NASA website is a fantastic resource. You will see that the equation for lift coefficient is actually the lift equation rearranged. Quote Link to comment Share on other sites More sharing options...
Gemma Jane Posted February 21, 2009 Share Posted February 21, 2009 A useful graph that is often used is the lift coefficient plotted against angle of attack, here is one for the Clark-Y, many NACA foils can be found with a little searching on the web(this graph came from Wiki) We can see a few interesting things from the graph, like for instance the lift is not zero at zero angle of attack, the Clark-Y is producing some lift already at zero angle of attack. The the lift increases as the angle of attack increases until the angle of attack gets to around 16/17 degrees and then the amount of lift rapidly falls, this is the stall. Don't worry too much about the drag coefficient, but it is useful for design to plot both together on the same graph so one can see how drag is increasing with lift. Quote Link to comment Share on other sites More sharing options...
Ash Posted February 22, 2009 Author Share Posted February 22, 2009 Thanks for the advice guys. Chris just the name of the books is fine and i will see if i can find the at the library. Peter i looked on ABE books anf there are several copies, so i might buy one. Eric there are also five coppies of the book that you have sugested on ABE so i shal buy one of them too. Thanks for the graph Gemma i am going to test the clark y airfoil so it will be usefull. Quote Link to comment Share on other sites More sharing options...
Chris C Posted February 22, 2009 Share Posted February 22, 2009 martin simons "model flight" is a general book on model areoplane areo dynamics martin simons "model aircraft areodynamics, fourth edition" is almost a uni text book with lots of calulations and exstensive diagrams on wing design and profiles, hope this helps tell us how you get on :D Quote Link to comment Share on other sites More sharing options...
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