On Mar 4, 5:28 am, ---@--- (Robert Scott) wrote:
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

On the Acers unit I use to balance my prop the accelerometer is bolted
to the centerline of the engine in the proper direction. That sensor
is position sensitive. The light sender is taped on the top of the
cowling facing forward shining on the prop. it is about 13" away from
the reflective tape thats applied to the prop. The handheld unit is
routed into the cockpit using long cables from both sensors. The thing
works amazingly good. My last balance procedure got the prop/ spinner
to within .001 IPS. The smoothness is well worth the hour or so of
setup and running...

Ben
www.haaspowerair.com