Figured out how to screenshot WTRTI display,
tl:dr - Circle mousejoy more sensitive than square mousejoy. Circle mousejoy more sensitive towards deviations from 90 and 45 degree inputs respectively. 90 points overlap between square and circle, deviations from 90 lead to increased sensitivity.
Consider:
Imgur: The magic of the Internet Outer circle f4u-4, 45 degree line. 16:16 for square
Imgur: The magic of the Internet Outer circle f4u-4, 45 degree line. 23:23 for circle
Imgur: The magic of the Internet Tip of 45 degree line f4u-4, 27:27 for square
Imgur: The magic of the Internet Tip of 45 degree line f4u-4, 37:37 for square
Square increased from 16:16 to 27:27 (11 step) for 45 degree movement.
Circle increased from 23:23 to 37:37 (14 step) for 45 degree movement.
For pure inputs,
pure left roll, circle
Outer circle: Imgur: The magic of the Internet 23
Tip of line: Imgur: The magic of the Internet 37
pure left roll, square
Outer circle: Imgur: The magic of the Internet 23
Tip of line: Imgur: The magic of the Internet 37
pure pitch up, circle
Outer circle: Imgur: The magic of the Internet 23
Tip of line: Imgur: The magic of the Internet 38
pure pitch up, square
Outer circle: Imgur: The magic of the Internet 23
Tip of line: Imgur: The magic of the Internet 37
It looks like Circle and square correspond 1:1
Therefore, it is impure inputs (that have both roll and aileron) that appear more sensitive than either which is logical given a circle’s sides intersect a square at 90 degree points, but fit inside the square at 45 degree points. Technically, it’s more correct to say that square loses sensitivity when it deviates from 90 degree inputs (since the input maximum increases to intersect with the square’s corners.)
Takeaway: Use square mousejoy can potentially stall you when reducing roll/pitch mixing with square joystick.
Going from 27% to 37% for 45 degree inputs to 90 degree inputs might well be the reason you stall in a spitfire.