But if we revert to measuring the horizontal dashed line in the drawing (mine), and divide that by the horizontal distance, it would show a value smaller than the horizontal bottom line.
The Cg will move in an arc rearward, which then puts the tires closer to the vertical position of the Cg. I have to go hunt up my good calculator and try the tangent , then measure for the second method and compare.
I played with the calculator and COS gives the same value as my measurements, or within 1 percent.
Take the number of degrees times COS;
15 degrees x cos = .966
30 degrees x cos = .866
45 degrees x COS = .707
Note that the first 15 degrees the Cg is above horizontal the power to lift the Cg only drops 3.4 percent.
At 30 degrees, it is now down by 13.4 percent
At 45 dgrees, it is down by 29.3 percent.