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  1. #1
    Senior Member 40m's Avatar
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    Default Belly Pods and CO levels

    I asked Dan elsewhere on the forum and know of two other cases where increased levels of CO where detected inside the cockpit after the installation of their Pod, one was a Carbon Cub EX and the other a Super Cub. Are others experiencing this increase and to what levels? Remedies?

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    Default Re: Belly Pods and CO levels

    Interesting...watching

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    Senior Member 40m's Avatar
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    Default Re: Belly Pods and CO levels

    Quote Originally Posted by hawgdrvr View Post
    Interesting...watching
    You are partly why I asked

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    Default Re: Belly Pods and CO levels

    I'm certainly considering the Carbon Concepts pod. I can see the issue but you'd think there would be sufficient airflow. CO is a big concern and I need to get a detector. Thanks for raising the topic.

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    Senior Member 40m's Avatar
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    Default Re: Belly Pods and CO levels

    Quote Originally Posted by hawgdrvr View Post
    I'm certainly considering the Carbon Concepts pod. I can see the issue but you'd think there would be sufficient airflow. CO is a big concern and I need to get a detector. Thanks for raising the topic.
    Check your PM

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    Senior Member Dan L's Avatar
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    Default Re: Belly Pods and CO levels

    Readings in the hundreds is dangerously high. In my recent flying mine are now sub-ten.

    I'm wondering what openings in the seat base you’re referring too? Where the battery cables penetrate?

    Could the Heat valve box be the source? They’re not sealed real tight and I know from tracking oil stains my pod causes oil to flow into the direction of flight in that general area. The pod does strange things to the flow. A friend put a pod on his Citabria this spring and had a lot of weird airflow issues too, mostly with cylinder cooling.

    It looks like your blue tape should have covered the openings Bob mentioned where the gear attaches. Those are source of flow too.
    Flying Carbon Cub EX #11 since 2011

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    Senior Member N867SP's Avatar
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    Default Re: Belly Pods and CO levels

    Quote Originally Posted by Dan L View Post
    Readings in the hundreds is dangerously high. In my recent flying mine are now sub-ten.

    I'm wondering what openings in the seat base you’re referring too? Where the battery cables penetrate?

    Could the Heat valve box be the source? They’re not sealed real tight and I know from tracking oil stains my pod causes oil to flow into the direction of flight in that general area. The pod does strange things to the flow. A friend put a pod on his Citabria this spring and had a lot of weird airflow issues too, mostly with cylinder cooling.

    It looks like your blue tape should have covered the openings Bob mentioned where the gear attaches. Those are source of flow too.
    Yeah, the blue tape did cover the openings at the cabane vee to fuselage.

    The openings would be where to torque tube passes thru seat base at front and rear. That’s where I had the highest readings. Other openings are grommeted and sealed pretty tight.

    If you keep the sky light vents pointed forward and cockpit pressurized numbers are low. If you open cabin heat and pressurize cabin numbers are low. If you turn skylight vents around to vent cabin into negative, numbers climb. As you lean the mixture numbers drop. Straight and level numbers. We’re higher than climb or decent numbers.

    Just did 15hrs to and from WAD and we’re always able to keep numbers <50PPM but took some work in proper venting, luckily we had mild temps.


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

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    Senior Member turbopilot's Avatar
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    Default Re: Belly Pods and CO levels

    Quote Originally Posted by 40m View Post
    I asked Dan elsewhere on the forum and know of two other cases where increased levels of CO where detected inside the cockpit after the installation of their Pod, one was a Carbon Cub EX and the other a Super Cub. Are others experiencing this increase and to what levels? Remedies?
    The belly of the CC is under positive pressure and the cabin in flight runs at a lower pressure. I removed a belly access plate aft of the extended baggage compartment because there was a nice 1/2 steel tube to attach a belly GoPro.

    I went flying and my Sentry gave me an alarm for CO through ForeFlight running on my iPhone. Pretty neat. Landed immediately and found another place to mouth the GoPro.

    I would guess the same could happen with any kind of hole or tear in the fabric on the belly.
    Last edited by turbopilot; 09-29-2020 at 12:36 PM.
    Bob Anderson, CC11-00435, N94RA

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    Senior Member Dan L's Avatar
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    Default Re: Belly Pods and CO levels

    I picked up my Carbon Concepts pod from Randy In Wasilla. On my way home from Alaska I noticed a headache at times and my carbon monoxide levels were high. As I mentioned elsewhere, adding extensions onto the exhaust system cured the problem.

    I flew today and the levels were 1-3. I ran it hard too breaking in my new rings 2600-2700 rpm for 3.3 hours.
    Flying Carbon Cub EX #11 since 2011

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    Default Re: Belly Pods and CO levels

    How did you add an extension? Pictures?

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