- Aug 8, 2009
Agree low aspect ratio may be the exception, particularly for crude tips. Just a caution that you may not see the fine results. Also note that non-symmetric weight needs to be accounted for.You're welcome to think that.
Personally, working with low to intermediate aspect ratios, I know the data from xfoil doesn't appear correct. I tried, hired an aero eng to figure my garbage in/out issue - it wasn't me/my data. He did a reasonably optimized tip using xfoil - it was worse than square tips.
1/3 scale and swapping asymmetric tips gives a decent data point with trim settings. Let's one quickly see better / worse. Swapping out to pairs for stall/max speed testing is more accessible than wind tunnel time.
A commercial airliner wing vs a homebuilt wing are vastly different in optimization - ones designed already to limit losses ones designed mostly for ease of construction.
I'll get some data points hopefully soon - new datalogger and pitot has been in transit for months. You'd hope it would come in soon...