I had read somewhere that the buzzsaw sound was caused by the tips of the fanblades in the engines revolving at supersonic speeds when at full power -- the resulting air currents cause the sound. (I am not making this up).
<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by rrz518:
It's odd...what's that buzzsaw noise at takeoff in these things? It goes away right after they power down after takeoff, and you don't hear it again. Heard it profusely in 3A.....</font>