vane type air flow meter

I wired up a airflow meter to find out what the diferent voltage outputs are with the diferent vane angle

vane angle        voltage out
0                        2.2v
20                     4.7v
40                     6.8v
60                     7.6v
80                     8.1v
100                   8.5v
120                   9.4v

The result shows that the more angle aplied to the air  flow meter the more voltag out.When i did some research on this airflowmeter to get the specification I used google and put in the partnumber(bp0513210)i found that this airflow meter came out of a mazda 323 it measure airflow with a spring loaded flap

This is an example of a vane type air flow meter