how g-force may affect angle calculation?

[gentunian]

In stationary desk this library seems to work fine. The only issue I found is for angles greater than ~86° but that's ok for the use I want.

But when accelerating manually I can see some variations that are hard to tell on real-world scenarios. For example, attaching this to an airplane to measure roll and pitch while doing a leveled-turn (that is g-force being applied while turning) is something extremely hard to test.

And sadly I'm not a math of physic guy so I was wondering how would the airplane acceleration may affect the pitch and roll angles. Any ideas to share? I was willing to build a homemade roll and pitch data logger.

Best