YO!!!!! Guys sorry for the thread necro-zombification! Just wanted to share the huge overhaul I made on this delta I showed you a couple of months ago... And guess what, IT FLEW LIKE A BEAST!!! (Video down below if you want to skip my rambling).
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As shown in the 2 photos, it's a HEAVY redesign!! Key differences include closing the huge slot behind the prop with a piece of foam (gap was about 5", down to 2.5") also added a rounded spar at the edge behind the prop so the air from the prop won't hit a flat edge. Also the elevons were redesigned not to be embedded since it might cause control issues, also rounded the tip edges instead of being completely sharp, finally glued them with nylon hinges to prevent foam tearing. Sorry for the long waffle and thanks for all your contributions before!
Enjoy the video 😊