"__ Bob __" wrote in message
...
# Fred # wrote:
Really funky looking teeth pattern unlike a combination blade - so what's
the advantage in using this type of blade?
Variable pitch eliminates harmonics which cause blade warpage at running
speeds .. .. ..

How could you tell if the blade exhibit harmonics? Never had that problem
before but, on the other hand, if I don't know what I'm looking for I
couldn't tell the difference between the harmonics between the blade or the
motor.