Rotax 503 question.

Discussion in 'General Experimental Aviation Questions' started by deskpilot, Jul 30, 2019.

Help Support HomeBuiltAirplanes Forum by donating:

  1. Jul 30, 2019 #1

    deskpilot

    deskpilot

    deskpilot

    Well-Known Member

    Joined:
    Jun 30, 2009
    Messages:
    1,093
    Likes Received:
    182
    Location:
    Morphett Vale, South Australia. Just south of Adel
    I have an early 503 on my thruster but as yet, have not connected the tacho. Why, because there is no grey wire coming out of the engine. All diagrams say this wire is for the tacho. My question therefore is, how else can I get the correct impulses to operate said tacho?

    My home team RecreationalFlying.com.au couldn't provide me with an answer. Can anyone here help me?
     
  2. Jul 30, 2019 #2

    radfordc

    radfordc

    radfordc

    Well-Known Member

    Joined:
    Feb 5, 2008
    Messages:
    1,233
    Likes Received:
    494
    dmar836 likes this.
  3. Jul 30, 2019 #3

    n3puppy

    n3puppy

    n3puppy

    Active Member

    Joined:
    Jun 25, 2019
    Messages:
    40
    Likes Received:
    14
    When you say "Early" do you mean a 503 with points instead of CDI ignition?

    If so - here is the wiring digram for a points motor tach

    Also need the correct tach for a points motor
    E9481989-6D22-47A7-8636-EFD0A6072CD0.jpeg
     
  4. Jul 30, 2019 #4

    deskpilot

    deskpilot

    deskpilot

    Well-Known Member

    Joined:
    Jun 30, 2009
    Messages:
    1,093
    Likes Received:
    182
    Location:
    Morphett Vale, South Australia. Just south of Adel
    Thanks n3puppy, all I have is the tacho that came with the dismantled plane. I'm assuming it originally flew with this one. it's a Westach type 3AT8A-2 and I don't have, or need, the rectifier/regulator...no battery.

    DSCF5032.JPG
     
  5. Aug 1, 2019 #5

    ToddK

    ToddK

    ToddK

    Well-Known Member

    Joined:
    Jan 13, 2016
    Messages:
    176
    Likes Received:
    56
    Location:
    Humble
    I got one of those Hardline Tachs for my 582, its like a tiny tach only better. 1 wire, no ground, and you can substitute the Hardline wire with normal 18 guage awg up to 15 feet. This came in handy on my Chinook (which is a pusher). It reads right on with my MGL tach that is connected to the gray wire.
     

Share This Page

arrow_white