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Thread: Belly Pods and CO levels

  1. #71
    Senior Member Dan L's Avatar
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    Default Re: Belly Pods and CO levels

    We get about one day a week this time of year that is flyable. Yesterday was the day and I made another CO test.

    When I built my EX I exit Ed the airframe using a bulkhead type fitting. There was a bit of a gap around these fittings and the aluminum V-shaped belly pan. I put some white duct tape around these.

    E97BE5C4-9BE8-4632-A1D4-8B7824E803FF.jpg

    Originally I made some white kydex coins to go over the aileron penetration holes and glued them in place using Polyfiber glue. I noticed the coin on the left side had pulled lose on the front and was oily. That indicated to me that some exhaust flow was moving past the cable (which was also oily). My breather is on the left side. So I cleaned and re-glued the kydex piece.

    46FBFBDC-577A-46AF-857D-682CADE1C88A.jpg

    One or both of these fixes lowered the CO numbers but I still have CO present in single digits and in a descent with flaps it still rises into the 20 PPM range.

    Better but not cured yet.
    Flying Carbon Cub EX #11 since 2011

  2. #72
    Senior Member Springloaded's Avatar
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    Default Re: Belly Pods and CO levels

    Quote Originally Posted by Dan L View Post
    This afternoon became a very nice winter fly-day. Cold but clear so I made a new test with the Aithre to see if my hole plugging near the tail helped. The short answer is that it did.

    Today my readings were in the single digits for climbing and cruise. Acceptable.

    Descending they jumped into the 20s and with flaps pulled up to about 30.

    Attachment 11333

    I have a T3 tail spring system now and just forward of the attach point there is a small opening where there is no fabric. I cut and sliced a piece of foam pipe insulation and pushed into the hole. This sealed it off well. The foam is black but probably visible in this image.

    Attachment 11334

    When I built my EX I fabricated an aluminum tail clean-out pan. It is removable with three Southco fasteners. Where it joins the first cross tube I put in two seaplane style drains. The blue painters tape is covering these two drains and the joint. This seems to be the main problem area based on my first test with only the foam filling the hole - not much improvement with just that hole plugged.

    My theory is that exhaust gas was following the belly and then low pressure inside the tail section was pulling some inside. Lower pressure in the cabin allowed it to migrate forward and become measurable.

    The question now is where is it entering when descending and pulling flaps? Flaps are apparently changing the airflow enough that the under-belly flow is finding a different entrance. Once flaps are retracted it takes some time for the readings to go back to ďnormalĒ. Like 5 minutes or so.

    Using cabin heat or not makes no difference. And today was surely one for heat. Up at 4500-6000í it was -5 degrees.

    Attachment 11335

    The uavioncs AV20S calculates density altitude and today the DA was about -3000 feet from actual altitude.

    Attachment 11336

    I enjoy seeing the elk out on the open areas.
    Dan
    I have a smoke system on my plane. So I can see the smoke from exhaust coming in when I have my pod on. It just rolls in from under panel and it almost instant so Iím thinking it from up front. I tryed taping gear leg holes up it didnít help on mine.
    Chuck Kinberger
    Southern Cubs
    Florida Cubcrafter Sales
    Jupiter Fl.
    Pa11890ck@gmail.com
    You can sit at home & hear the News or get out there & be the News

  3. #73
    Senior Member turbopilot's Avatar
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    Default Re: Belly Pods and CO levels

    Quote Originally Posted by Springloaded View Post
    Dan
    I have a smoke system on my plane. So I can see the smoke from exhaust coming in when I have my pod on. It just rolls in from under panel and it almost instant so Iím thinking it from up front. I tryed taping gear leg holes up it didnít help on mine.
    What type of pod?
    Bob Anderson, CC11-00435, N94RA

  4. #74
    Senior Member Springloaded's Avatar
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    Default Re: Belly Pods and CO levels

    Quote Originally Posted by turbopilot View Post
    What type of pod?
    Carbon concepts
    Attached Images Attached Images
    Last edited by Springloaded; 02-26-2021 at 03:33 PM.
    Chuck Kinberger
    Southern Cubs
    Florida Cubcrafter Sales
    Jupiter Fl.
    Pa11890ck@gmail.com
    You can sit at home & hear the News or get out there & be the News

  5. #75
    Senior Member turbopilot's Avatar
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    Default Re: Belly Pods and CO levels

    Quote Originally Posted by Springloaded View Post
    Carbon concepts
    We need to get these reports organized by pod type. Had a good discussion with Lew at LewAero. He claims no CO reports associated with his pods have been received.

    Now that I have the Aithre 2 hardwired to the G3X the engine log files now show CO readings every second. So it is easy to see when the CO level rise during a flight, even if they are not high enough to trigger a CAS alert. So far the highest readings I have seen are 4 ppm during ground operations. CO is rarely above zero in flight.
    Last edited by turbopilot; 02-26-2021 at 05:40 PM.
    Bob Anderson, CC11-00435, N94RA

  6. #76
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    Default Re: Belly Pods and CO levels

    I have talked to a few people with Lewaero pods and have not found any CO complaints. The pilots Iíve talked to all have fuel pods. Mine is a cargo pod and I have had a CO problem since I installed it. I taped all doors, windows, etc. around the cabin with no luck locating the source of entry. I am now assuming itís coming from the bottom of the fuselage somewhere and Iím going to work on that next. My high readings are short lived, while Iím landing, but I have at least single digits at all times.
    Last edited by mikemacon; 02-26-2021 at 08:32 PM.

  7. #77
    Senior Member Dan L's Avatar
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    Default Re: Belly Pods and CO levels

    It sounds like Mike and I are having the same experience; single digit readings always and an increase in the landing configuration.

    Today I taped around the teardrop shaped cover over the front elevator pulley. But it was not a good day to fly and test. It is worth mentioning that some years ago I looked at this cover as a potential entry point and put some weather seal around the contact edges on the inside of the cover. That was pre-pod.

    D60F0166-EDA8-422E-A7F9-11633B7ECAB8.jpg

    Springloadedís comment about smoke entering immediately from somewhere under the panel is intriguing.

    per Bobís request, if I havenít already mentioned it, my pod is a Carbon Concepts cargo pod.
    Flying Carbon Cub EX #11 since 2011

  8. #78
    Senior Member Springloaded's Avatar
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    Default Re: Belly Pods and CO levels

    Quote Originally Posted by Dan L View Post
    It sounds like Mike and I are having the same experience; single digit readings always and an increase in the landing configuration.

    Today I taped around the teardrop shaped cover over the front elevator pulley. But it was not a good day to fly and test. It is worth mentioning that some years ago I looked at this cover as a potential entry point and put some weather seal around the contact edges on the inside of the cover. That was pre-pod.

    D60F0166-EDA8-422E-A7F9-11633B7ECAB8.jpg

    Springloadedís comment about smoke entering immediately from somewhere under the panel is intriguing.

    per Bobís request, if I havenít already mentioned it, my pod is a Carbon Concepts cargo pod.
    I donít know why I didnít think about that little panel🤷
    Chuck Kinberger
    Southern Cubs
    Florida Cubcrafter Sales
    Jupiter Fl.
    Pa11890ck@gmail.com
    You can sit at home & hear the News or get out there & be the News

  9. #79
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    Default Re: Belly Pods and CO levels

    Taped around the teardrop and a couple of holes I drilled for wires to the LEDs I installed on the gear. No joy.
    Last edited by mikemacon; 03-02-2021 at 02:29 PM.

  10. #80
    Junior Member FionaMackenzie's Avatar
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    Default Re: Belly Pods and CO levels

    It doesn't look very reliable !
    Last edited by FionaMackenzie; 03-04-2021 at 10:12 AM.

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