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Re: Re: ASI reading low

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  • David Shanks
    Thanks Charlie, I ll give it a try. Dave ... From: charlie4_66043 To: Sent: Saturday, July 31, 2004 5:39 PM
    Message 1 of 5 , Aug 1, 2004
      Thanks Charlie, I'll give it a try. Dave


      ----- Original Message -----
      From: "charlie4_66043" <radfordc@...>
      To: <FLY-UL@yahoogroups.com>
      Sent: Saturday, July 31, 2004 5:39 PM
      Subject: UL: Re: ASI reading low


      > --- In FLY-UL@yahoogroups.com, "David Shanks" <dmshanks@c...> wrote:
      > > I have a new ASI installed in a pod on my Sprint. I'm using 1/4"
      > Alum. for the pitot tube, and approx. 5' of nylon tubing plumbed to
      > the port on the ASI. I also have a static port drilled in a tube just
      > below the pitot tube. I've flown with this ASI with the static tube
      > connected and disconnected, and the results have been the same, about
      > 30 MPH indicated, and an actual (using GPS) airspeed of 40. The ASI
      > has a range from 0-75 MPH, with the first number on the face being
      > a "20" (after the "0", of course). Any ideas on what is going on, and
      > how I might fix it? Best, Dave
      > >
      >
      > Often you have to "tune" the static source to get the ASI to read
      > correctly. The technique is to install an air dam just in front of
      > the hole in the static source tube. The air dam creates a low
      > pressure zone just behind it. You can use a rubber O ring and slide
      > it back and forth until the static pressure is perfect. Or also just
      > wrap layers of tape around the tube just in front of the hole and
      > add/subtract layers to get the static pressure correct.
      >
      > Charlie
      >
      >
      >
      >
      > Need help? Contact: fly-ul-owner@yahoogroups.com
      > Yahoo! Groups Links
      >
      >
      >
      >
      >
    • Planeman
      Does your set up allow you to change from Knots To MPH ? Maybe it got switched to Knots Dave R ... [Non-text portions of this message have been removed]
      Message 2 of 5 , Aug 1, 2004
        Does your set up allow you to change from Knots To MPH ?
        Maybe it got switched to Knots
        Dave R


        >
        > Thanks Charlie, I'll give it a try. Dave
        >
        >
        > ----- Original Message -----
        > From: "charlie4_66043" <radfordc@...>
        > To: <FLY-UL@yahoogroups.com>
        > Sent: Saturday, July 31, 2004 5:39 PM
        > Subject: UL: Re: ASI reading low
        >
        >
        > > --- In FLY-UL@yahoogroups.com, "David Shanks" <dmshanks@c...> wrote:
        > > > I have a new ASI installed in a pod on my Sprint. I'm using 1/4"
        > > Alum. for the pitot tube, and approx. 5' of nylon tubing plumbed to
        > > the port on the ASI. I also have a static port drilled in a tube just
        > > below the pitot tube. I've flown with this ASI with the static tube
        > > connected and disconnected, and the results have been the same, about
        > > 30 MPH indicated, and an actual (using GPS) airspeed of 40. The ASI
        > > has a range from 0-75 MPH, with the first number on the face being
        > > a "20" (after the "0", of course). Any ideas on what is going on, and
        > > how I might fix it? Best, Dave
        > > >
        > >
        > > Often you have to "tune" the static source to get the ASI to read
        > > correctly. The technique is to install an air dam just in front of
        > > the hole in the static source tube. The air dam creates a low
        > > pressure zone just behind it. You can use a rubber O ring and slide
        > > it back and forth until the static pressure is perfect. Or also just
        > > wrap layers of tape around the tube just in front of the hole and
        > > add/subtract layers to get the static pressure correct.
        > >
        > > Charlie
        > >
        > >
        > >
        > >
        > > Need help? Contact: fly-ul-owner@yahoogroups.com
        > > Yahoo! Groups Links
        > >
        > >
        > >
        > >
        > >
        >
        >
        > Need help? Contact: fly-ul-owner@yahoogroups.com
        >
        >
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        [Non-text portions of this message have been removed]
      • David Shanks
        No, it s a mechanical unit. Thanks though! Dave ... From: Planeman To: Sent: Sunday, August 01, 2004 12:08 PM
        Message 3 of 5 , Aug 1, 2004
          No, it's a mechanical unit. Thanks though! Dave


          ----- Original Message -----
          From: "Planeman" <rrice@...>
          To: <FLY-UL@yahoogroups.com>
          Sent: Sunday, August 01, 2004 12:08 PM
          Subject: Re: UL: Re: Re: ASI reading low


          > Does your set up allow you to change from Knots To MPH ?
          > Maybe it got switched to Knots
          > Dave R
          >
          >
          > >
          > > Thanks Charlie, I'll give it a try. Dave
          > >
          > >
          > > ----- Original Message -----
          > > From: "charlie4_66043" <radfordc@...>
          > > To: <FLY-UL@yahoogroups.com>
          > > Sent: Saturday, July 31, 2004 5:39 PM
          > > Subject: UL: Re: ASI reading low
          > >
          > >
          > > > --- In FLY-UL@yahoogroups.com, "David Shanks" <dmshanks@c...> wrote:
          > > > > I have a new ASI installed in a pod on my Sprint. I'm using 1/4"
          > > > Alum. for the pitot tube, and approx. 5' of nylon tubing plumbed to
          > > > the port on the ASI. I also have a static port drilled in a tube just
          > > > below the pitot tube. I've flown with this ASI with the static tube
          > > > connected and disconnected, and the results have been the same, about
          > > > 30 MPH indicated, and an actual (using GPS) airspeed of 40. The ASI
          > > > has a range from 0-75 MPH, with the first number on the face being
          > > > a "20" (after the "0", of course). Any ideas on what is going on, and
          > > > how I might fix it? Best, Dave
          > > > >
          > > >
          > > > Often you have to "tune" the static source to get the ASI to read
          > > > correctly. The technique is to install an air dam just in front of
          > > > the hole in the static source tube. The air dam creates a low
          > > > pressure zone just behind it. You can use a rubber O ring and slide
          > > > it back and forth until the static pressure is perfect. Or also just
          > > > wrap layers of tape around the tube just in front of the hole and
          > > > add/subtract layers to get the static pressure correct.
          > > >
          > > > Charlie
          > > >
          > > >
          > > >
          > > >
          > > > Need help? Contact: fly-ul-owner@yahoogroups.com
          > > > Yahoo! Groups Links
          > > >
          > > >
          > > >
          > > >
          > > >
          > >
          > >
          > > Need help? Contact: fly-ul-owner@yahoogroups.com
          > >
          > >
          > > Yahoo! Groups Sponsor
          > > ADVERTISEMENT
          > >
          > >
          > > ----------
          > > Yahoo! Groups Links
          > > * To visit your group on the web, go to:
          > > *
          > >
          <http://groups.yahoo.com/group/FLY-UL/>http://groups.yahoo.com/group/FL
          > > Y-UL/
          > > *
          > > * To unsubscribe from this group, send an email to:
          > > *
          > >
          <mailto:FLY-UL-unsubscribe@yahoogroups.com?subject=Unsubscribe>FLY-UL-u
          > > nsubscribe@yahoogroups.com
          > > *
          > > * Your use of Yahoo! Groups is subject to the
          > > <http://docs.yahoo.com/info/terms/>Yahoo! Terms of Service.
          >
          >
          >
          >
          >
          > [Non-text portions of this message have been removed]
          >
          >
          >
          >
          > Need help? Contact: fly-ul-owner@yahoogroups.com
          > Yahoo! Groups Links
          >
          >
          >
          >
          >
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