Thank you for the video, it's very helpful! But I have one question, I'm pretty new at this stuff so if it's a stupid question, I'm sorry in advance :) When I follow your instructions, just three columns with values show up in the end, is there any setting on how to add a column for drag coefficient C_D which doesn't show up? Thank you!
I think you are trying to output useful polar data. look up the command "pacc" which is for polar accumulation. Xfoil has a nice user guide. Maybe also try Xflr5 which is a GUI interface for xfoil (and much more). It makes accumulating polars and viewing plots effortless. it's also free!
Dr Hays thanks a lot for this video. I have one question regarding the FMOM command. To calculate the force how to proceed? there is a coefficient * rho (air or water density) * v^2 (velocity) and c. My question is what is C?
At 14:45 you mention there's some GUI's that go over Xfoil making it easier to make polars, etc. Would you mind sharing some insight into those? Curious what they are and how they function. Thanks and awesome tutorial otherwise.
I would recommend the Xflr5 program. Its latest version is quite stable, and you can conduct multithreaded Xfoil analysis with nice plotting. I was using it just today in fact!
I do not see a direct way of doing this in Xfoil. oper mode can tell you velocities at a point, but some additional post processing would be required to turn that into streamlines. another code similar to xfoil called "javafoil" can do streamlines for you: www.mh-aerotools.de/airfoils/index.htm
Hello Dr. Hays, thank you for sharing this useful technic. I have a question though, can we implement different Mach numbers in this software? I see it is fixed at Mach 0. Thanks again...
Betty C is right, but once the flow touches M1 anywhere, the model is done, so subsonic mach #'s only. I might also be a bit suspect of near transonic speeds. Low mach should be fine though.
from where did u download the dat file from? and how do you design a new airfoil? the upload of the same to xfoil is understood but to design and map the airfoil I am interested to learn about the same
Many dat files can be found on airfoiltools.com. If you want to design your own, you could either manually enter points and graph them, use a CAD software to export a point cloud from a spline sketch, or utilize the in-built airfoil modification functions in the gdes mode of Xfoil to modify an existing airfoil into what you want.
Hi Dr. Hays, I am trying to run Xfoil on my laptop using a linux sub system and am getting this error to do with fonts: Error of failed request: BadName (named color or font does not exist) Major opcode of failed request: 45 (X_OpenFont) Serial number of failed request: 26 Current serial number in output stream: 28 I don't suppose you know the solution to this? Thanks, Freya
@@DrHays-go1cn thank you for making the video and sharing it with the public, I really appreciate it. Do you have any resources you could recommend for someone who is interested in optimization using xfoil?
Hi friend, how to de-rotate airfoil please ? green line is not aligned with TR et LD edge for me. I have tried the command dero, but it doesn't work, do you have an idea how to use it, please?
I had this same issue. I had to search the file in the windows explorer (entire thing) and it took me to appdata...etc folder. So search it and you will find it
thank you. what a beautiful tutorial for a beautiful program.
Thank you very much for the tutorial, Dr!
very rich information in one video... very apreciate Dr Hays
I appreciate this tutorial so much! It was really nice and detailed. I learned a lot.
Thank you! :)
Thanks a lot! I found tutorial very useful.
This is so good dude -- make another one of these showing a full analysis of a wing, or showing advanced techniques!
You can't, it's 2D aerofoil theory
%100 Really appreciated , thanks God, that sent you to me at this moment
Thank you.
Thank you for the video, it's very helpful! But I have one question, I'm pretty new at this stuff so if it's a stupid question, I'm sorry in advance :) When I follow your instructions, just three columns with values show up in the end, is there any setting on how to add a column for drag coefficient C_D which doesn't show up? Thank you!
I think you are trying to output useful polar data. look up the command "pacc" which is for polar accumulation. Xfoil has a nice user guide.
Maybe also try Xflr5 which is a GUI interface for xfoil (and much more). It makes accumulating polars and viewing plots effortless. it's also free!
Dr Hays thanks a lot for this video. I have one question regarding the FMOM command. To calculate the force how to proceed? there is a coefficient * rho (air or water density) * v^2 (velocity) and c. My question is what is C?
Chord length
At 14:45 you mention there's some GUI's that go over Xfoil making it easier to make polars, etc. Would you mind sharing some insight into those? Curious what they are and how they function. Thanks and awesome tutorial otherwise.
I would recommend the Xflr5 program. Its latest version is quite stable, and you can conduct multithreaded Xfoil analysis with nice plotting. I was using it just today in fact!
Hi Dr.Hays . I have a question. There is a way to get a flow field with all streamline at a fixed Lift Coefficient on Xfoil??
I do not see a direct way of doing this in Xfoil. oper mode can tell you velocities at a point, but some additional post processing would be required to turn that into streamlines.
another code similar to xfoil called "javafoil" can do streamlines for you:
www.mh-aerotools.de/airfoils/index.htm
@@DrHays-go1cn I thank you for the quick answer! Thank you for the video too.
Hello Dr. Hays, thank you for sharing this useful technic. I have a question though, can we implement different Mach numbers in this software? I see it is fixed at Mach 0. Thanks again...
From main menu, enter OPER to go into that menu. Then enter MACH to change Mach #
@@berenicecervantes4275 thank you 😊
@@tugbamacit4224 Of course!!! :)
Betty C is right, but once the flow touches M1 anywhere, the model is done, so subsonic mach #'s only. I might also be a bit suspect of near transonic speeds. Low mach should be fine though.
from where did u download the dat file from? and how do you design a new airfoil? the upload of the same to xfoil is understood but to design and map the airfoil I am interested to learn about the same
Many dat files can be found on airfoiltools.com. If you want to design your own, you could either manually enter points and graph them, use a CAD software to export a point cloud from a spline sketch, or utilize the in-built airfoil modification functions in the gdes mode of Xfoil to modify an existing airfoil into what you want.
I encountered an issue called "convergence failed" for viscous calculations. Airfoil is RAF 25.
How can I resolve that?
Hi Dr. Hays, I am trying to run Xfoil on my laptop using a linux sub system and am getting this error to do with fonts:
Error of failed request: BadName (named color or font does not exist)
Major opcode of failed request: 45 (X_OpenFont)
Serial number of failed request: 26
Current serial number in output stream: 28
I don't suppose you know the solution to this?
Thanks,
Freya
Respected Dr. Hays; my Xfoil software is not displaying Cd values. Can you suggest me a solution.
how to include the L/D ratio in the pacc file as it doesnt include this parameter
How to connect the xfoil with notepad for automation can you please tell me?
What course was this video produced for?
AME2223 intro to aerospace engineering, but I'm glad people are finding it useful in many places!
@@DrHays-go1cn thank you for making the video and sharing it with the public, I really appreciate it. Do you have any resources you could recommend for someone who is interested in optimization using xfoil?
@@Levi_Sheridan Xflr5. A nice free tool that does much more than just 2D Xfoil plotting.
@@DrHays-go1cn thanks for the reply!
Hi friend, how to de-rotate airfoil please ? green line is not aligned with TR et LD edge for me. I have tried the command dero, but it doesn't work, do you have an idea how to use it, please?
you could go in and directly edit the point file, but it's likely easier to go grab a properly conditioned point file from somewhere else to start
I can't get the notepad data on a separate notepad. it only appears in the programs.. anyone who knows how to activate this with this program?
Hey i am struggling to save the data files, i am not getting thrown any errors but i am not sure where it is saved to.
Fancy seeing you here. Did you sort it out Justin?
@@danielstewart3507 yeah honestly not sure what I did to fix it though just restarted everything and went through the process again
I had this same issue. I had to search the file in the windows explorer (entire thing) and it took me to appdata...etc folder. So search it and you will find it
Worst experience ever