Dears,
Sorry for layman’s question, but I need some clarification. Usually the pitch angle is defined as the angle between the longitudinal axis of the aircraft and the horizon. So it’s determined by roll around the lateral axis of the plane. Positive angle means ‘nose up’, negative ‘nose down’ with respect to the horizon. Fine, but what about when the plane flies up side down for a while? In such situation the pitch angle is also determined by roll around the lateral axis of the plane, however are signs of the pitch angle reverted or not? In other words, in this position of the plane, positive pitch angle still means nose up with respect to the horizon or nose up with respect to the lateral axis, therefore nose down in respect to the horizon?
I’ve heard, than newer AHRS system can recalculate coordinates of the plane and can show pitch angle always in respect to the horizon, even during barrel roll. Is it correct?
Cheers, PMK
By: Arabella-Cox - 13th March 2011 at 07:51
Roll pitch and yaw angles are always expressed relative to the airplane’s axes. The AHRS takes all the information and presents a picture of the airplane from the pilot’s perspective relative to the earth.
By: TonyT - 13th March 2011 at 04:56
A gyro such as you had at school when spun always stands up…… ok your artificial horizon is a gyro just like that but with the display attached, so if you roll inverted the sky part ie the blue would be upside down in the cockpit to your view, as the gyro will still be the correct way up in reality, so you would pitch down but show a positive pitch on the display…… does that make sense? as you went over the top the whole display would rotate round…… some aerobatic ones you lock as the gyro can topple as it goes over.
does that make sense, is that what you are getting at?
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March 11, 2011 at 12:23 pm