Yes, this is one of my earlier videos. I've been trying to get the music dialed in on the right volume level. If you find a more recent video with a more pleasing volume level let me know. Thank you very much for watching!
hello, thank you so much for share. So, i need a help: i try run for NACA 63412, but i don't have success: This designation not implemented. Can you help me ? or could someone help me?
I thought in inviscid flow there is no drag, can someone please explain why there's still occuring pressure drag in the XFOIL solution (with a negative sign) ? Thanks! But otherwise really helpful and well structured video!
Cp is a surface integral around the region of the airfoil. XFOIL calculates this counter clockwise thus , its the opposite of the found one. It can never be negative because it violates thermodynamics. And it has a value because its not symmetrical around the chord. If it was a NACA 00XX , then it would be 0 , correctly. But actually the surface integral of Cp is non-zero due to the fact that it has a curvature. Hope it helps you.
Unfortunately, I can't remove the music without removing the video and uploading a different video without the music. That maybe something I do in the future if I ever decide to update/remake some of my XFOIL videos but isn't in the near term. The later videos in my series don't have background music so hopefully you don't have to suffer too much to get to those. Hope you enjoy the content of the video regardless of the background music.
Yup, as @Russell Miller mentioned, before going to the OPER menu you must first have loaded an airfoil. You can do that by using the "NACA" command followed by a space and the 4 or 5 digit identifier for the NACA airfoil you wish to use and hit (NACA 6-digit series isn't supported yet to my knowledge). This will load either a 4-digit or 5-digit airfoil into memory from the NACA "built in database". The other option is to load an airfoil from a file. This is a little more involved but I made a video covering the topic here: ruclips.net/video/g-SnoYE4yYk/видео.html Hope this helps!
Sometimes I have to switch between plots (by typing "cpx" and then retrying the "cpv" command) to get the plots to update. Give that a shot and let me know if you've found a different solution. Thanks!
Thank you very much!!
Thanks. Good to hear this was value-added content.
This might just save me for my practical
Hope your practical went well!
The background music makes me blast the keyboard.
Yes, this is one of my earlier videos. I've been trying to get the music dialed in on the right volume level. If you find a more recent video with a more pleasing volume level let me know. Thank you very much for watching!
@@thescienceofflight1404 Pretty interesting topics for all of us AeroMech's.
Keep the good job.
Thank you! Good to hear my videos are value added.
The music does slap and is very interesting/helpful
i want to run a simulation on simscale with my airfoil results form xfoil. how do i save my work on xfoil in CAD format.
hello, thank you so much for share. So, i need a help: i try run for NACA 63412, but i don't have success: This designation not implemented. Can you help me ? or could someone help me?
I thought in inviscid flow there is no drag, can someone please explain why there's still occuring pressure drag in the XFOIL solution (with a negative sign) ? Thanks!
But otherwise really helpful and well structured video!
Because of pressure distribution, as you can see, in the plot, pressure buildings up around the front of the aerofoil, which creates drag
Cp is a surface integral around the region of the airfoil. XFOIL calculates this counter clockwise thus , its the opposite of the found one. It can never be negative because it violates thermodynamics. And it has a value because its not symmetrical around the chord. If it was a NACA 00XX , then it would be 0 , correctly. But actually the surface integral of Cp is non-zero due to the fact that it has a curvature. Hope it helps you.
thank you for the explanation, but please leave out the music next time! It's killing me
Unfortunately, I can't remove the music without removing the video and uploading a different video without the music. That maybe something I do in the future if I ever decide to update/remake some of my XFOIL videos but isn't in the near term. The later videos in my series don't have background music so hopefully you don't have to suffer too much to get to those. Hope you enjoy the content of the video regardless of the background music.
When I type in the command "oper" , XFoil says "No airfoil avalaible" .Whats wrong? Thought XFoil has a build in NACA data base
You still have to tell it to load the foil. First command will be “NACA xxxx”
Yup, as @Russell Miller mentioned, before going to the OPER menu you must first have loaded an airfoil. You can do that by using the "NACA" command followed by a space and the 4 or 5 digit identifier for the NACA airfoil you wish to use and hit (NACA 6-digit series isn't supported yet to my knowledge). This will load either a 4-digit or 5-digit airfoil into memory from the NACA "built in database".
The other option is to load an airfoil from a file. This is a little more involved but I made a video covering the topic here: ruclips.net/video/g-SnoYE4yYk/видео.html
Hope this helps!
@@thescienceofflight1404 Thx to both of you.
after plotting the first pressure distribution graph, i typed cpv, but graph did not changed at all...please help
Sometimes I have to switch between plots (by typing "cpx" and then retrying the "cpv" command) to get the plots to update. Give that a shot and let me know if you've found a different solution. Thanks!
@@thescienceofflight1404 Hello man! I tried it too, but it´s not working. Do you have another suggestion?
@@tiagogregorio4134 did you ever find a fix?
@@thescienceofflight1404 i have this same error...have you ever found a fix, running on the latest version for windows
The music ruins an otherwise good video.
I'll take this into consideration for future videos. Thanks.