The second part of the ram air effect investigation involves covering the opening of the Eventuri air scoop.
The drive speeds were repeated as with the first test and results compared.
The results are not conclusive, but there seems to be a VERY slight improvement in pressure with the opening unobstructed.
In the chart above the solid red line is with the scoop opening clear and the solid blue line is of the opening covered. The dashed blue and red lines represent the margin of error for each test case, based only on pressure sensor measurement error. The margin of error has significant overlap.
The difference between the two test cases on average is 0.1 inches of H2O, which is approximately 0.004 psi. The maximum difference is 0.2 inches of H2O, approximately 0.007 psi.
There is a very slight increase in air pressure at the intake inlet with the scoop opening clear, but there is a substantial overlap in the margin of error between these two test cases.