Pocket altimeter in an ultralight?

Discussion in 'Instruments / Avionics / Electrical System' started by cluttonfred, Mar 23, 2018.

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  1. Mar 23, 2018 #1

    cluttonfred

    cluttonfred

    cluttonfred

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    Has anyone ever used a pocket hiking altimeter like this in a light aircraft? Could it make a useful lightweight alternative for an ultralight panel or is there some reason (response time, accuracy, etc.) that it wouldn't be worth it?

    altimeter-202.jpg

    https://suncompany.net/tactical/altimeters/
     
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  2. Mar 24, 2018 #2

    Dana

    Dana

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    I used a Suunto wrist altimeter for paragliding.
     
  3. Mar 26, 2018 #3

    slevair

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    I have used a wrist altimeter from back in my skydiving days. It gave me no problems in ultralight use.
     
  4. Mar 26, 2018 #4

    Chris In Marshfield

    Chris In Marshfield

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    A lot of the newer smart phones have baro sensors in them as well. If you have a late-model smart phone so equipped, then, as they say, “there’s an app for that”.
     
  5. Mar 26, 2018 #5

    TFF

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    There are plenty of wrist watches with alts.
     
  6. Mar 26, 2018 #6

    cluttonfred

    cluttonfred

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    In my case I am still interested in lighter and/or cheaper alternatives to ordinary panel-mounted 2-1/4” altimeters for VFR use. Some barometric adjustment is a necessary feature so I don’t think a watch would do it unless there is one with easy barometric adjustment.
     
  7. Mar 26, 2018 #7

    Wanttaja

    Wanttaja

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    I once took a combination electronic altimeter, compass, and thermometer up for a test run. Biggest issue was the lack of an external static port; the altitude increased by ~200 feet just due to the prop blast during runup.

    Ron Wanttaja
     
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  8. Mar 26, 2018 #8

    cluttonfred

    cluttonfred

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    Ron, it's funny that you say that as I was surprised to see that the large 3-1/8" size UMA altimeters are not supposed to be connected to the static line at all. "Note: Do not connect 3 1/8” altimeter to static line, because case is not sealed and a static leak will result!" I guess that means that you would give them their own static line to a fuselage static port so as not to mess with the ASI. The smaller, more expensive 2-1/4" size UMA altimeters are sealed and do use a static line.
     

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