Tail Rotor / Fuselage Attitude Relationship
Hello,
I'm new to this forum so I apologize if I'm breaking any rules. I've stumbled across the answer to many helicopter aerodynamics questions that I've had in these forums but didn't make an account until now.
I have an aerodynamics question that has me stumped which I'm unable to find a good answer for. Hopefully someone can help me out?
I fly a Bell 212 (CCW blade rotation). I noticed that in straight and level, trimmed cruise flight with level fuselage attitude and constant collective and cyclic position if you bring the aircraft out of trim by applying right pedal the fuselage will yaw right and pitch down, and if you apply left pedal it will yaw left and pitch up.
Where do these nose up/down tendencies come from? Maybe the answer is very simple and I'm just missing it, but I am stumped. Thank you in advance for the help!