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How to wire in a Hobbs meter correctly.

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  • #46
    How to wire in a Hobbs meter correctly.

    talk about getting over complicated.

    A SPDT mag switch wired so that the common (centre) connection is the ground. One end terminal is connected to one of the mags, as usual, the other end is the ground for the Hobbs. The live for the Hobbs comes from somewhere that is live when the battery master is on.

    Voila! master on and mags on runs the Hobbs meter.

    It doesn't matter which mag switch you wire it to or even if the Hobbs connection goes to both mag switches.

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    • #47
      How to wire in a Hobbs meter correctly.

      Running the Hobbs via a mag switch won't work as you'll miss vital seconds of every flight whilst you do your mag checks!
      How about installing an oil pressure switch and running it off that?

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      • #48
        How to wire in a Hobbs meter correctly.

        > Mike's suggestion is just idiotic, as most of the engine wear will occur before the oil temp reaches 50C, yet his Hobbs meter won't even have started yet. There's a word for that Mike: Fraud!

        Well, I thought the idea was to log the flying hours, not the engine hours. Original poster might want to clarify his or her intent....

        But yes, maybe a trolley that's dragged along with the aircraft (big wheels, heavy), stays on the ground when the aircraft lifts off, pin is pulled out (insulator between two brass strips) and that starts the Hobbs? Avoids the wind problem, but (sadly) also avoids sealing wax and string.

        Mike

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        • #49
          Do yo think this will work, if so it’s sooo simple
          Its often best to keep one's mouth shut, and let everyone think you are a twit, than open it, and remove all bloody doubt....

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