I'm searching a clear answer from anoyone that knows???
When lowering the collective in straight and level flight, the nose pitches down.
Answers have ranged from flapforward (but there is no change in IAS so no change in amounts of disymmetry and resultant flapping?), precession from decsent flow on the dic (there would be descent flow equally over the entire disc?), descent flow on the horizontal stabalizer forcing nose down attitude or reposition of A/C CofG due to loss if lift.
Come now all you technical types
Cheers all for the help...