Max Hugen

Apparently the Kdl parameter is available in Xfoil, it's in the OPER->VPAR->LAG sub-menu (so I'm told). This param changes the rate of wake dissipation, which is useful when studying cavitating hydrofoils. For a background on this discussion, see Dr Mark Drela's response at: https://forums.sailinganarchy.com/index.php?/topic/211073-boats-and-foils-comparison/&do=findComment&comment=7476818

I opened a project that I'd used just a couple of days ago and got the above error. When it opened, nothing was showing, all my foils and data were gone. As I don't have a backup I'm in real trouble. Is there any way to recover the project? I have attached the file just in case anyone has an idea. :(

Sheesh! I feel like such an idiot... I thought you were referring to Options > Prefs > Save... And all the time it was right in front of my face, after many hours trying everything I could think of. Thanks for your patience, you just made my day! Cheers, Max

Thanks Jochen, but it is checked. I also made a copy of the previous project that works, loaded the Eppfler foil, and tried it - same result! The other foils displayed the OpPoints and Display options, the Eppfler one does not. :( Any chance you could try out the Eppfler foil I attached above, and see if XFLR5 works OK for you pls? Wondering if I should try a re-install next...

I'm still trying to determine what the issue is. I'm testing an Eppfler 376 foil, and when I first began trying it, everything worked AOK. I have another Project using a different foil which is still OK. I tried starting a New Project and loading the foil, and ran it "as is" without Normalising or doing Refine Locally, and left panels at the original 61. No go. Then I tried doing the Normalising & Refining, setting the Panels to 100 as recommended. I did notice that it did not save panel number at...

I'm still trying to determine what the issue is. I'm testing an Eppfler 376 foil, and when I first began trying it, everything worked AOK. I have another Project which is still OK. I tried starting a New Project and loading the foil, then ran it without Normalising or doing Refine Locally, and left panels at the original 61. No go. Then I tried doing the Normalising & Refining, and set the Panels to 100 as recommended. I did notice that it did not save panel number at 99 as it does with my previous...

I've done something that has disabled the selection of the OpPoints for a Polar, and the Display and Graph Curve settings are also disabled, as per attached image. Although I've looked at every menu item that I can find, and did Options > Restore and > Reset, I'm still unable to view opPoints. The program is working and I can export the Polars OK. I can also open a previous project, and select/view the OpPoints. But if I create a New Project and import the foils from the problem Project, it too has...

Hi Andre... I certainly found that out after many fruitless hours trying all sorts of combinations! I've had zero probs using my mainsail profile previously, which does include the mast as you suggest. [RESOLVED] But there is some light! It was suggested that I look at the Eppfler 376 profile at http://airfoiltools.com/airfoil/details?airfoil=e376-il ... and then I realised I should have added a "luff track" in the first place, when trying to define a head sail. Anyway... I am now getting limited...