Originally Posted by
arismount
... if I were you guys and had to do that I'd just put in a little extra tuition and become an engineer instead of a pilot. You'd probably live longer, make more dough, and be happier.
Hehehe, wish that were true! Still i started on an engineering path as a kid growing up in TX - so maybe don't count, yawl.
Anyhow, did some calcs to satisfy myself of something. The stiffest rotor blade i know is Comanche with 15% effective offset hinge. This gives the blades a natural frequency of 1.12 that of the rotor rotation rate. Depending on blade damping, i get the following pitch phase lead angles:
1.0 * Critically damped: 84.9 degrees
0.5 * Critically damped: 79.9 degrees <-- R22 feels like this.
0.2 * Critically damped: 64.6 degrees
So i guess i've just learnt even more about rotor dynamics from Nick Lappos!
Mart