PPRuNe Forums - View Single Post - Coriolis vs Conservation of Angular momentum
Old 15th Dec 2020, 18:52
  #17 (permalink)  
heliman500
 
Join Date: Jan 2006
Location: USA
Posts: 24
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by 212man
I don't know what the FAA manual says, but in reality a rotor is not demonstrating conservation of angular momentum at all! It can hardly be described as being in a zero torque, frictionless, environment!
212man Correct, Angular momentum is not applicable when there is a torque applied, however, consider the rotor system in autorotation or rapid descent (power on or off), this is when conservation of angular momentum is prevalent.

dickmct couldn't agree more

Originally Posted by Robbiee
Its basically; When a blade flaps up, its center of mass moves inward towards the hub, causing it to accelerate. When the blade flaps down, the center of mass moves outward towards the tip, causing it to decelerate.

Fully-articulated rotors absorb this acceleration and deceleration through the lead/lag hinges. Semi-ridged rotors don't experience it to the extent that fully-articulated rotors do, as the center of mass remains virtually unchanged as the system teeters, due to the underslinging of the blades.
Robbiee correct, however the principle you are describing is conservation of angular momentum, and not Coriolis effect. Conservation of angular momentum is just one part of the formula that describes the theoretical / fictitious Corilis effect

Last edited by heliman500; 15th Dec 2020 at 19:12.
heliman500 is offline