Thanks for the answers !
So it appears that:
- maybe the APC prop as a baseline is good enough so it don't see any improvement,
- maybe the thesis' test is suffering of some misleading errors, whatever it is (the improvement don't look like what is expected from the modification).
- surely I'm disappointed...
MSelig, you know my wind tunnel can't be compared to what you have, or what they have at Wichita ! same for my knowledge...
I look at the UIUC website twice a week to see if there is something new ! propeller tests are really interesting, maybe a good drag built up method is now lacking