Kitfox Aircraft Stick and Rudder Stein Air Grove Aircraft TCW Technologies Dynon Avionics AeroLED MGL Avionics Leading Edge Airfoils Desser EarthX Batteries Garmin G3X Touch
Results 1 to 3 of 3

Thread: Rotax 912is/915is Installation

  1. #1

    Join Date
    Dec 2019
    Location
    Idaho
    Posts
    117

    Default Rotax 912is/915is Installation

    Both of these engines have the same basic wiring so I'm interested in hearing from those that have either type of engine.

    There are 5 cables that come from the engine lanes which interface with the ECU (3 of them) and the rest of the aircraft electronics (the 2 HIC connectors).
    4 of them have a ground tab on them and I am trying to determine where the ground tab is supposed to be connected. The 2 options are EMS
    ground (on the fusebox) and airframe ground. The EMS ground is connected to the airframe ground only during application of start power.
    In the 915is installation manual there are 2 references to these grounds and they appear to contradict each other:

    Screen Shot 2023-08-22 at 10.44.45 AM.jpg
    Screen Shot 2023-08-21 at 6.15.52 PM.jpg

    and

    Screen Shot 2023-08-21 at 6.17.39 PM.jpg

    Screen Shot 2023-08-22 at 10.45.37 AM.jpg

    Does anyone know which one I should follow?

    Victor
    Attached Images Attached Images
    Building SS7
    915iS
    Garmin G3x

  2. #2

    Join Date
    Mar 2021
    Location
    Chico, CA
    Posts
    66

    Default Re: Rotax 912is/915is Installation

    Victor,
    I hesitate giving much input because a) I'm not an expert at this, and b) we have yet to perform the first start-up and test of the engine (a few more weeks!). My dad and I spent hours reading both the Rotax and Kitfox installation manuals, and probably made a few dozen calls to confirm.

    Section 77-00-00 has a good image showing some of what you're inquiring about. Section 24-00-00 has a wiring diagram (AE 5S_0160) that we stared at for hours. The small ring terminals ground to the M4 posts on regulator A. Regulator B is grounded to the airframe. The other larger ring terminals from the electromagnetic shielding wires can ground to the firewall.

    Evan Brunye did a great video overview of the 915 when he was building his Sling (he's since built a Kitfox and won a builder award). This was very helpful: https://www.youtube.com/watch?v=2VaiBcHjzlA

    Hope that helps. And if any of you 912is/915is veterans spot an error in what I'm saying, please let me know!
    Last edited by Redline; 08-22-2023 at 02:58 PM.
    Jason B.
    Phase 1 - S7 STi
    Dynon | 915is

  3. #3

    Join Date
    Dec 2019
    Location
    Idaho
    Posts
    117

    Default Re: Rotax 912is/915is Installation

    Quote Originally Posted by Redline View Post
    Victor,
    The other larger ring terminals from the electromagnetic shielding wires can ground to the firewall.
    Those are the ground wires I was referring to. The grounds on the other end (engine side) go to their
    respective Regulator A/B.

    Anxious to hear what others say.

    Victor
    Building SS7
    915iS
    Garmin G3x

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •