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Thread: vsi undereading

  1. #11
    Captain woodysr2's Avatar
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    Hi Joan yes I realize that shortening the tube would/could make the response times quicker but was trying to rule out possible kinks in the tube under the floor panel.
    I removed the hose and re sited it where it could be seen and was getting the 200 fpm up after this but this may be caused by air being sucked out of the flap cut outs which is why I was going to fit a fuel filter in the end of the static tube to damp down response times.
    I was more concerned about false asi and altitude readings if there were any leaks in the system I can use sky demon and transponder to check altitude I have a brauniger hg vario to check climb rate but the speed probe will be too short to get out of prop wash to be accurate will try to get someone alongside and compare speeds.
    fly high fly safe and may you always have the wind at your back
    (except when taking off or landing according to Phil )


  2. #12
    Captain woodysr2's Avatar
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    Hi Russ
    Yup that's the way I read it as well it was just the thought of spending over £300 on an instrument that may not be faulty LOL.
    If it is then I can get one from Mehndelssons same day.
    I will see if I can borrow a vsi from Colin at Strathaven from a dash he has lying in his hangar
    fly high fly safe and may you always have the wind at your back
    (except when taking off or landing according to Phil )


  3. #13
    Co-Pilot Flyingboy's Avatar
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    Hi Woody,
    I have one of these lying around, if you want it.
    It would be Thursday AM before I could drop it off at Strathaven though.

    https://www.gps.co.uk/beijing-instru...a-vsi/p-0-792/

    Cheers
    Michael

    Flying coast to coast to coast of the USA April/May 2018 in G-BZIM

    www.flickr.com/microlightmikeee

    “everybody dies, but not everybody lives” .... The quote that led to my first microlight flight, August 2012.



  4. #14
    Captain woodysr2's Avatar
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    Thanks Michael that would be great


  5. #15
    Captain woodysr2's Avatar
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    Update
    got down to airfield last night with Michaels donated VSI fixed on top of the dash and did a couple of take off's and landings and compared readings
    My VSI was definitely goose'd using alti and stop watch (read second hand on wrist watch LOL) Michael's unit was nearly spot on mine was under reading by just under 400fpm
    his 890fpm mine 500fpm both gauges rose evenly until just over 400fpm then mine stuck at 500fpm
    removed static tube from vsi and re routed remainder of static hoses and repeated checks with same results everything else seems to be in order, airspeed and altitude checked against skydemon and transponder.
    After all checks thought it was a shame to waste a lovely evening so went for a bimble for an hour popping in to Strathaven en-route.
    fly high fly safe and may you always have the wind at your back
    (except when taking off or landing according to Phil )


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