Quote:
Originally posted by Topaz
Thank you indeed, Hans. I downloaded XFLR5 and was able to run through my trade study on elevon span in a fraction of the time I was expecting. While I wasn't looking for strictly accurate numerical results, I was able to make comparisons of one version versus another in short order.
Nice program. |
Hi Topaz, I'm glad you liked it! Perhaps you can use this tool to underpin your 'fear/respect' for swept-back configurations?
On another note, I still don't really see/understand where the underlying techniques of these two programs could support the analysis of a delta or double delta configuration. Even if knowing the local section behaviour in such a wing configuration is cool, I reckon that outside the linear aerodynamics regime these programs can't really help. How would they correctly analyse the high AOA (vorticity) case?
In Hoerner's "Fluid Dynamic Lift" there is a section about delta's, that contains formulae that tell you how much lift due to vorticity and how much 'normal' lift is produced at any AOA. These formulae are approximations, perhaps good ones, but approximations nonetheless. What is left out is what happens with moments when sweeping through an AOA range... Also, these formulae apply to single delta's only...