Phantom v1212, User Manual

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Chapter 5: Measurements
If all the points are in the same image when performing
three or four-point measurements, the software only
calculates the angle. In order to compute angular speed
the first point and the reference point must be on the
same image while the second point (three-points mea-
surements) or reference point 2 and point 2 (four-point
measurements) must be on different images.
Angular speed is calculated using the formula: as=a/dt,
where a = measured angle, dt = [time of the last point
frame] – [time of the first point frame] if first and last
points are on different frames.
These measurement tools are exceptional when analyzing
a rotating object.
The ability to measure an object, like a projectile rotating
in mid-air, to determine its angular speed can be applied
to other sciences, for example, the way 2 x 4 board
could tumble in hurricane-force winds can be applied by
manufacturers who develop unbreakable glass windows,
or engineers developing stabilizers for aircraft.
PCC calculates speed (mph) and angular speed (rpm) of the fan motor using Distance, and Angle, and Speed:
1 Point measurement tool