I recently started using the Hirobo FRP-blades on my Sceadu 30. I first tried the 550 mm but I needed at least 8° pitch to get my bird of the ground. So I put 570 mm FRP-blades on it but with almost no improvement. Throttle is already way over 50% at mid-stick. Anybody has any idea how to improve lift at mid-stick ? If I set 5° pitch at mid-stick, I need at least 65 % throttle to lift off. With my former wooden blades I needed about 5° and 50% to lift off. Why this difference ?

whish one are you using fully semetry. or semy?
my gues that semi semetrycal got more lift and full semet. is good for 3d but that is my opinion

They are semi-symmetrical (I guess) because lower side is slightly flatter than upper side. My guess was also that these blades should give more lift, but on the contrary, they don't.

By the way, what is the difference between semi-symetrical and assymetrical ?

i was checking the diference and is exacly what you said the bottom is flater than the top hope this help thanks