"RST Engineering" wrote in message
...
Yes, all of the below.

Sometimes you drill a hole in a small magnet and use a small screw to hold
it to the propeller backing plate. Sometimes you use a strip of
reflective
tape on the prop itself. Sometimes you use a pulse from the #1 magneto
lead.

Jim

This guy was talking about a notch and proximity detector for the phase
detection. I know about all of the things you mentioned, but the proximity
detector's workings are new to me.
--
Jim in NC