How do you define “optimal pitch”? To maximize thrust you would want to set your pitch for the greatest possible thrust within the limits of the motor/esc combo (or 80-90% to be conservative). This will correspond to different pitches for static compared to flying at 22mph (for a hang glider speed would be 30mph). Alternatively is “optimal pitch” the most efficient setting i.e. highest grams / watt?
If you “optimized” pitch at 22mph to most efficient and / or max thrust and pushed the ESC/Motor combo to its max rating you may overload the motor at 0 airspeed trying to take off. However if you mountain launch and just want power once airborne this would likely work. The pitch needs to be a balance for both scenarios, tuned for just flight, or variable pitch.
Pitches of 6 and 8 maybe good for takeoff but are way too low once you get to speed. 10 is good for takeoff (static) however a little low at airspeed optimal for flying is around 16-24.
For the previous chart i don’t have amp and voltage data as that chart is based on an equation not actual data. I have static data for 21x12 and 22x12 props, however it’s a 30v setup with different motors and ESC combo than Open PPG. Below is static data I have for my CF folding 18.5 x 10 prop setup, I didn’t test that setup yet on a car at speed.
The new test stand is based on a 50v system with motors rated at 4,400 Watts so i think it is more comparable to open PPG. I’ll post the test data when i have it.
I’m outside of Philadelphia in case anyone is local and wants to help.