Posted by LenNH on February 03, 2009 at 12:25:55 from (71.235.191.159):
In Reply to: F4 mag ? posted by Doug Steinbach on February 01, 2009 at 09:20:33:
The cap on the back of the mag is "off" when it is rotated to the left looking from the back, which is to say that the lever is all the way up. You can certainly attach a ground wire as described above if you're not concerned with originality. The cap does the same thing--it grounds the low-tension side of the mag, right through the body of the magneto. Here's a magneto story for you. Recently, a pilot in a 1940s biplane was coming in for a landing at the airport in Lebanon, NH. As he approached from the north, his engine quit dead. The airport is on a flat spot on the top of a ridge, and the approach faces a steep cliff rising probably 200 or more feet from I-89, which runs more-or-less E-W below the top of the cliff. The pilot KNEW he'd hit the cliff head on if he continued, so he wheeled the plane around 90 degrees and set it down on I-89 South. This guy was some pilot, because he got the plane down, WITHOUT DAMAGE and WITHOUT HITTING ANY CARS, on I-89, "dead stick." The cops came, blocked traffic, called a tow truck. The plane was towed down the on-ramp and taken to the airport. Problem: An old magneto switch that shorted out BOTH magnetos. A mag is "hot" or "on" all the time, unless it is shorted out. Pilots don't fool around with wiggling propellers back and forth because they never know if the mag might be hot. Props aren't good for the human head.
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