Builders:
Below a look and an integrated system I developed. I’m holding a front alternator bracket. Threaded into the bracket is a very high quality sensor for a tach. It is tripped by two small AN-3 bolts, in precision CNC drilled holes in the ring gear. This is a compact arrangement using parts like the bracket and ring gear which are already doing a primary task. This gives 2 pulses per revolution, compatible with virtually all glass cockpits.
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The sending unit is not cheap. It is made in the US by a very reputable company. I have it on my website as a service, the price I sell them for is $2 over what it costs me to buy them hand have them shipped to my place. But I like the way it works with the other parts to be a very simple and elegant installation. If you got a ring gear from me in the last few months, it came with the 3/16″ holes, alternator brackets have the 3/8-24 thread for the sensor. If you have earlier brackets or ring gear, you can drill these holes carefully in your shop. I’ll include the locations in a later video.
Several months ago I shared a look at testing eight different pickups and various locations on the ring gear. The is the final result for anyone building a plane with a glass cockpit.
WWJR
Hi William. Have you devised a solution for rear alternator engines? Also, if I built a bracket to align this in the right place is there any reason not to use it to count ring gear teeth instead of two bolts?
Thanks, Gordon
Gordon, there are several solutions, to fit specific alternator positions at instrumentation. Give me a call 904-806-8143