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Thread: Weight & Balance worksheet for PA22-150/160

  1. #11

    Join Date
    Nov 2012
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    Northwestern Illinois
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    Default Re: Weight & Balance worksheet for PA22-150/160

    Quote Originally Posted by flynfish View Post
    The Type Certificate gives this for the PA-22 150:
    Normal Category:
    (+17.5) to (+23.0) at 2000 lb.
    (+12.0) to (+23.0) at 1800 lb.
    (+9.5) to (+23.0) at 1400 lb. or less
    Utility Category:
    (+13.5) at 1680 lb.
    (+12.0) to (+13.5) at 1665 lb.
    (+9.5) to (+13.5) at 1400 lb. or less

    and this for the PA-22 160
    Normal Category:
    (+17.5) to (+23.0) at 2000 lb.
    (+12.0) to (+23.0) at 1800 lb.
    (+9.5) to (+23.0) at 1400 lb. or less
    Utility Category:
    (+13.5) at 1680 lb.
    (+12.0) to (+13.5) at 1665 lb.
    (+9.5) to (+13.5) at 1400 lb. or less

    Brilliant! Why didn't I think of that? Thank you!
    Steve

  2. #12

    Join Date
    Jun 2010
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    Hutchinson, MN
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    Default Re: Weight & Balance worksheet for PA22-150/160

    I set this up with a moment envelope method. Keeps the math to add and subtract as the charts calculate the moment from the load. I have attached a filled example below.

    PA22-150 W&B Worksheet Example.pdf

  3. #13

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    Jan 2008
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    Toquerville, UT
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    Default Re: Weight & Balance worksheet for PA22-150/160

    Quote Originally Posted by Swift4steve View Post
    Brilliant! Why didn't I think of that? Thank you!
    Steve
    Here is a simple W&B calculator with that info stuffed in. 5741D-W+B.xlsx

  4. #14

    Join Date
    Jul 2019
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    Default Re: Weight & Balance worksheet for PA22-150/160

    Dear Tri Pacer friends, having had a look at the arms in both the XLs and pdf above, it appears that the numbers are incompatible with the arms used by my maintenance shop. They have used 59" for the avionics. Since 49" would then mean the front seats are ahead of the instruments. Any ideas?

  5. #15

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    Mar 2017
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    Default Re: Weight & Balance worksheet for PA22-150/160

    Sounds like your avionics shop doesn't know how to calculate W&B. Go back to them and ask what they did. The Datum on the Short Wing Pipers is the wing leading edge. SOunds like they used something other than the leading edge, likely the front of the engine????

  6. #16
    Gilbert Pierce's Avatar
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    Nov 2007
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    Germantown, Tennessee 01TN
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    Default Re: Weight & Balance worksheet for PA22-150/160

    The factory W&B on my Clipper used 60” forward of the leading edge as the datum. I guess back in 49 they hadn’t discovered negative numbers and the associated math. Still using that doesn’t account for the numbers they used.

  7. #17

    Join Date
    Feb 2010
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    Eufaula, OK
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    Default Re: Weight & Balance worksheet for PA22-150/160

    The shop may have pulled the panel location from an old equipment list without looking at current information but I am thinking the original equipment list I have for a PA20 shows 0” for the main wheel location.

  8. #18

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    Default Re: Weight & Balance worksheet for PA22-150/160

    Quote Originally Posted by Jeff J View Post
    The shop may have pulled the panel location from an old equipment list without looking at current information but I am thinking the original equipment list I have for a PA20 shows 0” for the main wheel location.
    I believe the main wheel axle Center line is the same station as the wing leading edge. TCDS calls the leading edge as the datum. AS Gilbert stated, he has W&B info from the factory that used something like 60" in front of the leading edge as the datum. About the only thing to do is work back through all the old W&B calculations and correct for a standard datum.

  9. #19
    Gilbert Pierce's Avatar
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    Default Re: Weight & Balance worksheet for PA22-150/160

    Here you go. Its a scan of the Clipper original cardboard Airplane Flight Manual dated October 18, 1948 Subtract 60 from each of the arms to get the real arm from the leading edge of the wing which you will notice is 60"
    Attached Images Attached Images

  10. #20

    Join Date
    Feb 2010
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    Eufaula, OK
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    Default Re: Weight & Balance worksheet for PA22-150/160

    A lot of the early Pipers used 2 reference points for weight and balance. The factory original W&B / equipment list for the PA20 I had showed 60” forward of the WLE as the datum then computed W&B and equipment locations from the WLE. As a result, some subsequent W&B computations were incorrectly accomplished. I believe it to be a common problem on many Shortwings.

    I don’t have my drawing cd handy to see where the panel would be located in relation to the WLE on PA22. I think he should be armed with before confronting the avionics shop.

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