Zenith Aircraft Builders and Flyers
Online Community of Zenith Builders and Flyers
Tachometer Sensor
There have been several posts about how to get RPM readings from the Jabiru. On my Gen 4 engine with MGL avionics I have had good luck with a standard 10 MM proximity switch (sensor). The key is getting a bracket to put the sensor within about 2mm of the passing magnets and setting the system to 2 impulses per rotation. My sensor is a TAIS brand from Amazon Taiss 1PCS NJK-5002C NPN NO（Normally Open) 10mm Hall Effect Sensor ... , but if I ever have any heat issues with it the bracket of course fits any other industrial prox switch.
Replies to This Discussion
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Permalink Reply by John Austin on
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Can't tell from your pictures, but it looks like the Gen 4 doesn't have the same aluminum "spider" brace behind the alternator the the earlier Gen's have? I drilled and tapped the spider to mount my Honeywell GT-1 sensor. It just happened to work out I could directly bolt to this brace and have a 3mm air gap to the magnet! I've got hundreds of hours on this sensor now and it is rock-steady reliable:
(This picture was taken before the wiring was routed and secured and the bolt safety-wired.)
John
N750A
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Permalink Reply by John Burns on
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There is still a spider, but the design is new. As you can see I had to be creative to get the sensor spaced properly because the new spider is farther away from the magnets than yours. I used one of the spider retaining bolts and one drilled and tapped hole to attach my bracket.
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