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Thread: Building the EX3 - Tips & Hints

  1. #161
    Member jeepgord's Avatar
    Join Date
    Jan 2017
    cedarsprings mi

    Default Re: Building the EX3 - Tips & Hints

    Just a note if anyone needs a prop hub so you donít have to install your new prop to fit your engine cowl I will loan out the one I have if they pay shipping it is for the Ex3 363 hartzell trailblazer you will have to install your spinner backing plate on the hub to do the fit up. my used hub has bolts and Gordon at 616-291-3969 or email me at Buy the way Dave you have been a big help to all builders out there and thanks for all your help with this build have done a great job with this.
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  2. #162
    Senior Member
    Join Date
    Jul 2015
    Broken Arrow, OK

    Default Re: Building the EX3 - Tips & Hints


    I just finished up the wiring on my latest build and did a little editing of the wiring chart to make one small typo error and to make some more clarifications. Previously on the kits, most of the instrument panel bus bar connections were done at the factory and my latest one didn't, so I added those wires to the chart in case yours doesn't come pre-wired either.

    I've attached the new chart and have updated my POST #71 with the new chart. Also I added more descriptions and definitions of a few things that may help, so go check it out if you are wiring or will in the future.

    Here is a cut and paste from the updated parts of that post:

    NOTE: If you happen to download a previous version of the chart from this post before today (Dec. 14, 2019 2:45 pm Central), then delete that and re-download the latest version with a few changes.)

    I have attached to this post an Excel spreadsheet that will pretty much be all you will need to install the harnesses. NOTE THAT THIS IS FOR THE EX3 AND IS DIFFERENT FROM THE EX2 (mostly because the electric fuel pump was added) SO DON'T USE THIS FOR THE EX2.

    Here's how it works. After we lay out the harnesses, we will simply grab a wire and look at the number (numbers and letters) on the end of the wire. Then simply go to the spreadsheet and find that wire number in the left column and then in the column next to it, see where it connects to. As I find and connect a wire, I mark it off the spreadsheet and then when finished, I look back and be sure all the wires are accounted for. This chart is for my panels which include the G3X Touch, Garmin 200 radio with the control head in the panel; 345R transponder with ADSB-In and Out (this is the remote unit); Garmin 307 autopilot with the control head in the panel and with 2 servos for pitch and roll. It does have the GAP26 AOA pitot; outside temp probe; and trim position sensor. If you equipment is different, then the configuration and wires will be different.

    The spreadsheet is broken down into AREAS of the aircraft where the wire is located like "LEFT HEADER PANEL"; "THROUGH THE FIREWALL"; "UNDER THE BOOT COWL" and "UNDER SEAT WIRING". So just go to appropriate area to find the wire you have and connect it where it says to.

    Start by installing the power wires that go under the seat (the big white wires, etc) and then run the left and right header panel harnesses and then the big G3X harness last.

    Note that "normally", the factory will install many of the wires that are on the main instrument panel that connect buses, etc. but on my latest one they did not, so I had to connect those.

    Let me first discuss some of the basics:

    1. A "BUS" is a strip of copper that you will see attached to the tops (or bottom of light bus) of several circuit breakers or switches in the panel. It's purpose is to provide power to all those CB's or switches it's connected to. You will always need 1 wire attached to the top of each "bus" that is bringing in power. It does NOT matter which breaker you install it to on the "bus" since the power will go via the copper bar to all the breakers or switches.
    a. The Lighting Bus is the short bus connecting only the 2 NAV and STROBE light switches.
    b. The LH Main Bus (See page 9 of the Exec. Glass Manual) connects 3 CB's of EXT, IBBS & FLD breakers.
    c. The RH MAIN BUS connects 4 CB's of FUEL PUMP, PFD, GSU & GEA.
    d. The AVIONICS BUS connects GMC, COM & XPND CB's. (See page 9)
    3. The EXTENDED BUS is the bus bar up in the LEFT HEADER PANEL that connects the START, STALL, TRIM & LANDING CB's.

    NOTE: This last kit I got had the EXTENDED BUS PLACARD WRONG. It had "INTERCOM" on the aft breaker and it will actually be used for the START wiring. If yours is labeled like this, get MITCH to send you a correct placard. The wiring in the wiring chart is correct for this.......just the placard is wrong. ALSO, you will note on Page 9 of the manual, it shows the START breaker on the RH MAIN BUS but that really is the FUEL PUMP breaker and not the START BREAKER. My placards was correct in labeling this but make this correction in your manual. (Upper left of page).

    ALSO, disregard much of the PAGE 4 schematics in the upper, left side showing the buses. This is not for the G3X so if you have the G3X, disregard most of these diagrams and instead refer to the schematics starting on PAGE 9 and labeled as "1 of 5" SCHEMATIC, EXECUTIVE GLASS TOUCH DISPLAY SYSTEM.

    When wiring in circuit breakers ("CB's), the wires will attach to the side of the breakers opposite of the copper bus bar.

    When wiring in SWITCHES, it doesn't matter which side of the switch you put the wires on. You can put them on the top or bottom (one wire will always be a power wire and one wire going to the item) of the switch. It will send power to the item when the switch closes the circuit.
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    Last edited by Daveembry; 12-14-2019 at 01:45 PM.
    Dave Embry
    "You only live once.....
    ..but if you do it right.....
    ....once is enough."..

  3. #163
    Senior Member
    Join Date
    Jul 2015
    Broken Arrow, OK

    Default Re: Building the EX3 - Tips & Hints

    I thought I would just put here a list of items for the EX3 that I keep on my iPhone NOTES.

    EX3 Data

    -Engine SUPERIOR AeroSport Serial #CC363i-1012 (N836DE)

    • Oil Aeroshell 100 Plus (break-in with Aeroshell M100)
    • Fuel filter. Andair ( Part FX375-MK-10MU (VP5612-003)
    • Belt Gates XL 11A0915. 17317SS 62 or 63. (Gates 7360 shipped with engine).
    • Belt AC Delco 15360 88934301

    Denso 021080-0760


    • Brake Fluid. Mil-H-5606 (Aeroshell #41)
    • Grease tail wheel Exxon-Mobile SHC-100 or aeroshell 22
    • Grease for axle bearings - Aeroshell-22 or Mobil 2
    • Odessy PC680 engine battery or new one SBS -J16.
    • backup ignition battery Powersonic PS-1221S. High-Tech Battery Solutions online
    • Denso 1K27 #5312 spark plug (came in engine) Denso W27ESR-U. Gap .32-.40 max
    • Spark Plug anti-seize Champion 2612
      • Torque 160 in lbs

    • Fuse. 5amp blade (large); 40 amp blade (special one) under seat base
    • Aerospace 303 for bush tires UV protector

    Oil filter-champion CH48108-1 (TCM P/N 649922). 160 In/lbs (13.3 ft/lbs)

    -Back-up battery PS-1221S Power Sonic 12v-3ah

    HARTZELL Prop. MODEL HC-C2YR-1NW/NG8301W-3. Governor. Hartzell Governor Model S-173. Test results RPH high 2420; Low 1490. At 1750 rpm at 50 psi input/150 psi output capacity 10.6 qts. Internal leakage 1.2 oz. Relief Valve Pressure 298 psi.

    -AILERON ANGLES. RIGHT & LEFT should be 18 degrees
    - 1st Notch. = 14.4
    - 2nd Notch = 33.2
    - 3rd Notch. = 46.3

    Garmin Installation Manual
    page 35-33 AOA calibrations
    -autopilot 35-50
    -page 650 adahrs
    -servo pitch wire instructions 35-47
    -email with questions
    -page 786 i used later for calibration the fuel flow after running a few tanks through to see if it matched or not.
    -705 auto pilot in air config
    -668 (674) 35-4-7 AOA config

    • 675 AOA In flight 35-4-7.1
    • 712 autopilot in air 35-71

    -654 Magnetometer 35-24
    -640 adhars config
    -690 Autopilot on ground check 35-49
    -705 Autopilot ground 35-64 must have set up adhrs first

    • page 845 Section A-1 for full flight testing of AP

    -800 trim position 35.159

    So you can go into the configuration menu/Engine and Airframe and then when you find the tab with the total time, hit the MENU button on the front and it will ask you if you want to make it editable. Then you can change the total time. There in that menu you can also change

    Total TimeĖ
    The Total Time displays the total operating time in hours, of the aircraft. This time is displayed on both the Engine Configuration Page and the Total Time Configuration Page. The Total Time (Current Hours) can be changed by the user, see the following procedure. The Record Mode selections are listed in Table 35-16.

    You can choose
    -NONE or
    -OIL PRESSURE (when it gets 5psi or greater it starts) or
    -FLIGHT TIME (Records Total Time when aircraft is airborne as determined by GPS data and the indicated airspeed) or
    -RPM (Records Total Time when RPM1 value indicates engine is running).

    To set Total Time: 1. In configuration mode, select Engine, then scroll down the list using the inner right knob (or use touch screen) to highlight Total Time. 2. Press the Total Time Bar. 3. Select Menu, Show Advanced Setting (to enable editing of Total Time field). 4. Edit Current Hours and Select Save.

    THIS IS FOR THE ENGINE TIME ONLY Engine Time Configuration Engine Time Ė Engine Time records the total operating time of the engine, in hours, when Record Mode is set to Enabled. Engine time will be recorded whenever engine RPM exceeds the value specified in the Minimum Recording RPM field. The Standard Recording RPM field determines the engine speed at which engine time increments at 1 hour per hour. Engine RPMs greater than the Standard RPM value will cause engine time to increase faster, and slower RPMs will cause engine time to increase more slowly. For example, if Standard Recording RPM is set to 2300, engine time will increase by 1 hour if the engine is run for 1 hour at 2300 RPM, and the recorded engine time will increment by approximately 0.9 hours if the engine is run for 1 hour at 2100 RPM. This type of engine time recording is typical for piston engine applications. The Maximum Recording RPM item sets an upper limit on the RPM readings used to calculate engine time. This can be used to prevent spurious RPM signals from adversely affecting recorded engine time. If the Minimum and Maximum Recording RPM items are set to the same value, engine time will be recorded at 1 hour per hour any time the engine RPM exceeds the Minimum Recording RPM threshold, and will be not be proportional to engine speed. This type of engine time recording is typical for turbine engine applications.

    To set Engine Time: 1. In configuration mode, select Engine, then scroll down the list using the inner right knob (or use touch screen) to highlight Engine Time. 2. Press the Engine Time Bar. 3. Select Menu, Show Advanced Setting (to enable editing of Engine Time field). 4. Edit Current Hours and Select Save.


    VNE- 170
    VNO- 140
    VSO- 48
    VS1 - 38
    VFE - 84
    VA - 106 maneuvering
    VX - 57
    VY - 71
    VG - 68 glide
    Sink rate - 715í/min

    G3X Configuration Settings
    AP Pitch

    • min limit - 60
    • Max limit - 155


    • weight - 2000
    • Max (cruise) speed - 140

    Fuel flow

    • 0-1 gph yellow
    • 1.1 - 17.9 green
    • 18.0 - 21.5 yellow
    • 21.5 red line

    Fuel pressure

    • 0-14.9 red + alert
    • 15 tick mark
    • 15-35 green
    • 35 tick mark
    • 35.1-40 yellow
    • 40 red line


    • bump normal green was 0-30a, is 0-40a (alt rated at 40 a
    • Optional change 40A-50A yellow and 50+ red

    • min vis. 58
    • Caution 43
    • Stall 39
    • Target 51

    In RD232 config

    • port 1 - Garmin instrument data
    • Port 2- Connext 57,600
    • Port 3 & 4 - Garmin Instrument Data
    • Port 5 - none

    In Transponder

    • port 2 - Connext Format 1

    -G3X Touch. System ID

    -SXM Radio ID

    -fuel tanks 12.0 lbs

    NOTE: I have included below the way you can tie the electric trim into the G3X Touch auto pilot but I have heard that there were problems with servos using this system but havenít confirmed it. I donít do it for 2 reasons. First, If you need to change the trim it is such a small change required it just isnít worth it. I just move my thumb a little and change it.

    Secondly, if you are trimmed and cruising along, trim changes arenít required very often. If you do not have the trim tied into the auto pilot, when the system senses increased torque on the servo as it tries to hold altitude, it will give you a yellow alert on the display saying to ďTrim upĒ, etc. You can choose to manually change the trim and it requires only a very short blip of the trim witch. However, if you are already trimmed ......most of the time you just hit a temporary up or down draft and they system will ask you to change the trim ......BUT.....a few seconds later when the up/down drafts will ask you to trim again. I never trim it when it asks unless it goes on for a longer period of time, which is rare.

    Garmin G3X Auto Trim
    By Bill Johnson, CubCrafters Service Center

    Are you tired of the Carbon Cub trim 'bump'? Yes, those of us who fly the Carbon Cub enjoy the electric trim, but the planes are pitch sensitive so you have to be quick on the trigger to prevent over trim. While on autopilot, you have to respond to the trim prompts. Not a big deal but there's a better way!

    For aircraft having a G3X system, the solution is auto trim. The RV builders have been using the G3X auto trim for many years and enjoy the convenience, however, CubCrafters has never offered this an option. Don't think that stopped us! There is a reason these are experimental aircraft!!

    With auto trim, you simply set the autopilot and let the Cub fly itself; no trim prompts, just enjoy the ride. Even with the autopilot off, you can 'set' the trim operating speed to make the bump a little easier to manage. It actually slows the trim speed at higher airspeeds and increases trim speed at lower airspeeds, even with the autopilot off.

    The best part? This is easy and cheap to do! Take pins 11, 12, 13, and 14 of the G3X pitch servo and connect them to the trim system. How you ask? Locate the two wires coming from the trim relay going to the trim motor under the belly pan. Cut those wires (to create 4 wires) and connect to the appropriate Garmin Pitch servo wires. This process should only take a couple of hours for the electrical work. Then configure the G3X and test fly. Tune the settings to you liking and enjoy the new capability. Don't want auto trim? Just turn it off!

    Reference the G3X manual for configuration and Carbon Cub schematics for trim servo motor wire numbers. On the first Carbon Cub SS I configured, the pin connections were as follows. But check for yourself! I offer no guarantee these are correct.

    Garmin Pitch Servo

    Carbon Cub Trim Relay/Motor Wire

    Pin 11


    Pin 12


    Pin 13


    Pin 14

    Now, this is somewhat easy to do, but if you would rather have a professional do it for you, give Bill a call at (270) 847-6511, or if you don't even have an Autopilot.... our order book is ready

    Last edited by Daveembry; 01-20-2020 at 05:08 PM.
    Dave Embry
    "You only live once.....
    ..but if you do it right.....
    ....once is enough."..

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