Why do you check PIDP.I to check the CoG of the plane?

[dasom2567 (Chomi)]

I read the document related to CoG in Wiki.

Wiki tells me to check if CoG is appropriate through I in PIDP, but why is it I, not P and D?

[Rolf]

@dasom2567

but why is it I, not P and D?

It’s simple math. Only from the integral of a curve you can read whether it runs more above or below the zero line.

@dasom2567

Wiki tells me to check if CoG is appropriate through I in PIDP

To conclude from the PIDP.I to the adequacy of the CG as the WIKI might falsely make you believe is daring. Sure, the PIDP.I depends on CG-Position but certainly not on the appropriateness of the CG due to the PIDP.I depends not only on CG and SERVOx_TRIM, it ist also influenced by the mechanical servo linkage, the difference in incidence angel between wings and horizontal stabilizer, the airspeed, changes in weight, the AHRS_TRIM_Y value or the Prop shaft inclination for example.

Rolf