<< when you say the engine speed is "factory set", does that mean some kind of
electronic governor? >>
Nah, just means that I have no control over the engine speed except to start it
or stop it. There's no "faster" or "slower" lever as there has been on most
other mowers I've used.
This fixed speed has not been a problem. The thing is locked at full throttle I
assume, which is just fine for the blade, AND (interestingly) the wheel drive
*never slows*, even if the blade is momentarily choked by thick lawn.
<< I'm not sure I understand the music part. 3600 rpm is 30 cycles; the fourth
harmonic would be 480...Is this what you did? If so, then maybe you do have
3000 rpm. >>
I heard no harmonics. I heard the engine generate a solid G, but couldn't tell
what octave. The fact that it's a G means it's roughly one of the following
(and feel free to extend the halving and doubling in both directions)187.5,
375, 750, 1500, 3000, 6000, 12000, 24000 hZ. I figured the mower's note was
somewhere near the middle of this range, but I still can't always discern
specific octaves, so if my guess of 3000 was too high, that only leaves 1500 or
750 to still be a G. Any lower than that though and you're getting into bass
notes, which the mower definitely does not make.
Thanks again folks!