Abstract
The linearized stability characteristics of rotor blades in forward flight are examined. Equations of motion are derived for the case of a centrally hinged spring-restrained rigid blade. Various commonly used approximations for the equations of motion are examined in order to determine their effect on stability calculations. These comparisons show that periodic coefficients are important for flap-lag stability even at low advance ratios. The effect of rotor equilibrium on blade stability is studied. It is found that the variation in rotor trim and inflow with forward speed has a significant effect of blade stability. Finally, rotor stability boundaries are presented for a variety of rotor parameters, showing that forward flight can often change the qualitative effects of certain parameters on blade stability.
| Original language | English |
|---|---|
| Pages (from-to) | 2-13 |
| Number of pages | 12 |
| Journal | Journal of the American Helicopter Society |
| Volume | 20 |
| Issue number | 4 |
| DOIs | |
| State | Published - 1975 |