Thanks for that Mitch! Yes, I'm interested, so I have the vid on 'watch later' and I've bookmarked Shark for a return! I will be Fwding to Tim!
'my' story starts here, with involvement in this particular bird https://www.rcgroups.com/forums/showthread.php?2955371-Yellow-Jacket-2M-Competition
( In the parent group= (Thermal) having the beginnings a handful of years ago, The Germans figured out how to get phenomenal performance , while reducing bird weights by 1/2- 2/3 ( Now a 'heavy' bird is 16 oz.). This brings up a whole new can of beans to the CAD fray, as now, instead of the 'normal' leading edge point, sanded to locations, a ( usually) 1/8" diameter carbon rod is the Leading Edge, along with a spar of (about) 10-12MM= 1/2" Carbon tube being the main structure backbone- instead of 'old fashioned' I Beam construction methods (I preferr) I decided to help one of the "grandpas" of RC Soaring to finish his 'dream bird'. I figured I would "do the short route" with infinite planes instead of my 'old fashioned' " solid" surface intersection. Long about #5, I realized I forgot to change pen colors from my Yellow surfaces, and intersected #6 when I lost the load. I now went "old fashioned" and all iz good! It's one of those days when I wished I hadn't 'gone online'- things were never this "intense" with pencils and Velum!