Bell 47 stabilizing bar

[royden]

Hi all. Is there any one out there that can explain how the stabilizer bar on the bell 47 works. I know the theory of what it does and why. I cant get my head around how its connected to the main hub and how its linked to the flight controls. Many thanks. Royden.

[brett s]

Pilot cyclic input moves the stabilizer bar, the bar changes blade cyclic pitch - there are hydraulic dampers between the bar & blades that control how fast it'll move.

[C. Beaty]

Here’s a schematic of the Bell bar that is pretty much self-explanatory.

[autorotate]

ive seen this discussed before and somone mentioned it as a rate dammper witch by looking at it seems to be the only logical explanation, for piliot cyclic input dosent directly control the bar. for example if you were to hold the blades to keep them from feathering or teetering the bar would move when cyclic was aplied. if bar was kept from teetering the blades would move when cyclic is aplied. thus output pitch control is dampned by the centrifigul rigidity of the bar assembly. the bar teetering moment sliglitly less than the blade flap moment wil cause the bar to deflect a little causeing pitch output to be ignored intil bar path corects itself. thats my take on it. the fact that is not used on many machines makes me qestion its efectiveness.