Richard
Most of my testing was done at 170 kts and above and all comparisons were a +10-11 kts from 170 kts T to 220 kts T. I did not find too many comparisons at the lower speeds but I did find some. From 150 ktsT to 170kts T were identical increases as the higher speeds, either with the 103 prop or the 113 prop. The 113 prop was 10 kts faster than the 103 prop at the same rpm. My 113 prop will give me a true airspeed of 200 - 202 kts at 2150 rpm. The reason I do not have many comparisons at the lower speds is that I usually clmb out at 150-160 kts ind at 3000 fpm with the 103 prop. I did a lot of research before I decided to go with the blended winglets. I know Mark says the winglet moved behind the leading edge reduces drag in comparison to the E racers flush wing to winglet, but I have never found any solid evidence on how much improvement moving the winglet back has as on the LE or Cozy. I do know that moving the winglet forward and blending the intersection is by far less drag than the winglet arrangement on theLE and Cozy. I do not recall the exact numbers in the improvement between the two designs but I recall about 30% improvement with the blended design. Dont quote me on that , its been a while since I went through the info. I will say that of all the modifications I have made and tried on the E Racer, this was by far the most significant. I would like to thank Mark for all his professional help on the proper and safe layup schedules for this modification, I would never had attemped this without his input. To answer your question on the trailing edge fences. If you fly your canard without lower winglets as the E Racer is designed, trailing edge fences will lower your landing speed by 10 kts. They work great, however they are unnecessary with the blended winglet. I flew without and with on the blended winglet and could not tell any
noticable difference. Low speed handling with the blended winglet is identical as the standard winglet.
Jack
E Racer 113