I've got one in the back of my head that I want to use for a future
Kitplanes article. I'm going to use an old phonograph cartridge with a
short "ball on the end of a needle" as my accelerometer and I was seriously
thinking of an inductive pickup on the #1 plug wire. The optical gig was
also a consideration, but I got to thinking how that would work out in the
sunlight.

Jim


"Robert Scott" ---@--- wrote in message
...
Can anyone tell me how a dynamic prop balancer works? I have heard that
it
involves an accelerometer to detect vibration, but it what do they use to
detect
the prop position to correlate with that accelerometer? Could it be an
optical
pickup from a mark placed on the prop? Or perhaps a pickup from the
magneto?
Although a mag pickup would be ambiguous by 180 degrees, I think. I was
just
brainstorming on how I might design one from scratch.

Robert Scott
Ypsilanti, Michigan