1. Forum
  2. Usenet
  3. REC.AVIATION.SOARING

  • Winter Altimeter Max Descent Rate

    From George Haeh@21:1/5 to All on Wed Feb 8 17:29:27 2023
    I have a Winter 57 mm altimeter and transponder on the bench for ADS-B configuration and altitude calibration.

    Living at 3,000, it takes about 6 cc from a syringe to descend 1,000'.

    I was gentle going up and down, but would like to know the limits on ascent and descent rate for an aneroid altimeter.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Mark Mocho@21:1/5 to George Haeh on Wed Feb 8 18:07:25 2023
    On Wednesday, February 8, 2023 at 6:29:29 PM UTC-7, George Haeh wrote:
    I have a Winter 57 mm altimeter and transponder on the bench for ADS-B configuration and altitude calibration.

    Living at 3,000, it takes about 6 cc from a syringe to descend 1,000'.

    I was gentle going up and down, but would like to know the limits on ascent and descent rate for an aneroid altimeter.

    Some instruments have made descents at rates that match (or sometimes exceed if under power) the gravitational pull of the planet, but the data are hard to analyze from the wreckage.

    Hint: start gently as you did. Then incrementally increase the rate until the instrument no longer returns to the field elevation when pressure is released. Then, report your findings on this forum and buy another one to replace the one you just broke.

    For the humor challenged on RAS, this was supposed to be a joke. See Wikipedia or Webster to learn what defines a "joke."

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From AS@21:1/5 to Mark Mocho on Thu Feb 9 08:08:28 2023
    On Wednesday, February 8, 2023 at 9:07:26 PM UTC-5, Mark Mocho wrote:
    On Wednesday, February 8, 2023 at 6:29:29 PM UTC-7, George Haeh wrote:
    I have a Winter 57 mm altimeter and transponder on the bench for ADS-B configuration and altitude calibration.

    Living at 3,000, it takes about 6 cc from a syringe to descend 1,000'.

    I was gentle going up and down, but would like to know the limits on ascent and descent rate for an aneroid altimeter.
    Some instruments have made descents at rates that match (or sometimes exceed if under power) the gravitational pull of the planet, but the data are hard to analyze from the wreckage.

    Hint: start gently as you did. Then incrementally increase the rate until the instrument no longer returns to the field elevation when pressure is released. Then, report your findings on this forum and buy another one to replace the one you just broke.

    For the humor challenged on RAS, this was supposed to be a joke. See Wikipedia or Webster to learn what defines a "joke."

    George - I can't give you a hard number but most altimeters I have seen cannot keep up with the ascent rate of a good winch launch, which can be as much as 4,000ft/min. They will still continue to roll-up after you leveled off and released.

    Uli
    'AS'

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Dan Daly@21:1/5 to All on Thu Feb 9 09:42:17 2023
    On Thursday, February 9, 2023 at 11:08:30 AM UTC-5, AS wrote:
    On Wednesday, February 8, 2023 at 9:07:26 PM UTC-5, Mark Mocho wrote:
    On Wednesday, February 8, 2023 at 6:29:29 PM UTC-7, George Haeh wrote:
    I have a Winter 57 mm altimeter and transponder on the bench for ADS-B configuration and altitude calibration.

    Living at 3,000, it takes about 6 cc from a syringe to descend 1,000'.

    I was gentle going up and down, but would like to know the limits on ascent and descent rate for an aneroid altimeter.
    Some instruments have made descents at rates that match (or sometimes exceed if under power) the gravitational pull of the planet, but the data are hard to analyze from the wreckage.

    Hint: start gently as you did. Then incrementally increase the rate until the instrument no longer returns to the field elevation when pressure is released. Then, report your findings on this forum and buy another one to replace the one you just
    broke.

    For the humor challenged on RAS, this was supposed to be a joke. See Wikipedia or Webster to learn what defines a "joke."
    George - I can't give you a hard number but most altimeters I have seen cannot keep up with the ascent rate of a good winch launch, which can be as much as 4,000ft/min. They will still continue to roll-up after you leveled off and released.

    Uli
    'AS'
    George, on the Winter webpage ( https://www.winter-instruments.de/hhenmesser ) , on the 57mm altimeter page, they describe a leak test in a link "Leak test of the instrumentation of sailplanes.pdf" at the bottom. There are lots of cautions... There is
    also an e-mail that probably would provide what you need if it's beyond this advice- technik@winter-instruments.de
    As always, it would be beneficial if you could let us know what you find out.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)