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Thread: Keeping CG within aft limit

  1. #1
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    Default Keeping CG within aft limit

    When loaded, seems awfully easy to get the CG aft of the 78.5" aft limit. Any of you Carbon Cub drivers have a hard time keeping yours w/in limits when loaded? Either 1320 SS's or 1860 FX/EXs?

    Thanks,

    Andrew

  2. #2
    Senior Member N867SP's Avatar
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    Default Re: Keeping CG within aft limit

    My EX is setup for 81 aft CG limits @1865 that helps


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    Pete
    ✈️CCK-1865-0078 N9PW
    Severna Park, MD W18

  3. #3
    Senior Member Dan L's Avatar
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    Default Re: Keeping CG within aft limit

    Quote Originally Posted by jasimmons View Post
    When loaded, seems awfully easy to get the CG aft of the 78.5" aft limit. Any of you Carbon Cub drivers have a hard time keeping yours w/in limits when loaded? Either 1320 SS's or 1860 FX/EXs?

    Thanks,

    Andrew
    No problem for me. I have an Excel setup for calculating W&B. Here's a sample:


    Enter Enter
    Sample W & B gallons fuel Weight Arm Moment
    weight of pilot: 175.0 71.4 12495
    weight of rear passenger: 180.0 96.1 17298
    forward cargo (max 100 pounds): 15.0 110.4 1656
    ext. baggage weight (max 60 pounds): 60.0 134.4 8064
    gallons of fuel (44 maximum): 13.0 78.0 83.9 6544.2
    Center of Gravity is inches from Datum: 75.8 Forward CG limit is 69.0" aft limit is 81.0" (Datum is 60.0" in front of LE)
    Total weight: 1517.6 Gross weight is 1865 pounds
    Total moment: 115021.6
    Weight under gross: 347.4
    Flying Carbon Cub EX #11 since 2011

  4. #4
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    Default Re: Keeping CG within aft limit

    Where does 81" come from. The POH and W&B sheet on the dropbox both quote 79" as the aft limit

  5. #5
    Senior Member N867SP's Avatar
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    Default Re: Keeping CG within aft limit

    Quote Originally Posted by Mark Albery View Post
    Where does 81" come from. The POH and W&B sheet on the dropbox both quote 79" as the aft limit
    81 is aft limit for EX


    Pete Meyer
    Severna Park, MD
    CCK-1865-0078
    ✈️N9PW
    Pete
    ✈️CCK-1865-0078 N9PW
    Severna Park, MD W18

  6. #6
    Senior Member N867SP's Avatar
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    Default Re: Keeping CG within aft limit

    Quote Originally Posted by N867SP View Post
    81 is aft limit for EX


    Pete Meyer
    Severna Park, MD
    CCK-1865-0078
    ✈️N9PW




    Pete Meyer
    Severna Park, MD
    CCK-1865-0078
    ✈️N9PW
    Pete
    ✈️CCK-1865-0078 N9PW
    Severna Park, MD W18

  7. #7
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    Default Re: Keeping CG within aft limit

    EX2 is quoted as 79" aft limit.

    It seems odd that it has changed from EX.

  8. #8
    Senior Member Dan L's Avatar
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    Default Re: Keeping CG within aft limit

    Quote Originally Posted by Mark Albery View Post
    EX2 is quoted as 79" aft limit.

    It seems odd that it has changed from EX.
    And when I built mine the forward limit was 69. And it would be hard to get to 69 too.
    Flying Carbon Cub EX #11 since 2011

  9. #9
    Senior Member Dan L's Avatar
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    Default Re: Keeping CG within aft limit

    I wonder what the reasoning was for moving the aft limit forward 2? The EX2 has more nose-down trim than the original EX too. There is probably an inch greater up horizontal stabilizer travel in the new style.
    Flying Carbon Cub EX #11 since 2011

  10. #10
    Senior Member TroyBranch's Avatar
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    Default Re: Keeping CG within aft limit

    I have mine at 81 and there is no reason for it not to be. I think the 81 is on the x cub too. I asked the factory at the time and they said use 81. Anything less and it is just not going to take the load. As Dan said, it has much more trim to help even more on the EX2.


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