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  • How does an energy variometer work? - Aviation Stack Exchange
    In a comment to an answer regarding instrumentation complexity, an "energy variometer" was mentioned, labeled in knots What does this dial actually show, and how does it work? The image accompany
  • flight instruments - What is the nature of the gliders vario lag . . .
    " The average mechanical variometer is about three seconds too late " What is the nature of this lag? Wouldn't a gentle blow into the static port make the needle move immediately (certainly without a delay of a few seconds between strongest blow and strongest needle deflection)?
  • How does this total energy compensation pitot tube work?
    The part that plugs into the aircraft looks something like this: From there, the pressures can be used to drive a normal airspeed indicator, total energy compensated variometer, or any other pressure instruments The excellent answer here describes how a backwards-facing pitot probe can be used to make a total energy measurement
  • Whats a normal response delay for a paragliding vario?
    It is an Altimeter-Variometer-GPS combo As you know, these devices warn the pilot with beeps during climbing and sinking I'm using the device for a couple of months but I recently noticed an interesting thing: When I enter the thermal I first feel the climb with my harness and risers But the device starts to beep with a delay of 1-2 seconds
  • Which is more accurate for height measurement: GPS or barometer?
    Directly comparing accuracy of GPS, barometric altimeter and radio altimeter makes little sense, because they each measure different quantity GPS measures ‘geometric altitude’ This is the actual height above the reference ellipsoid, in units of length It is fairly accurate, but there are external reasons it might be unavailable Barometric altimeter measures ‘pressure altitude’ It
  • Is there any difference between VSI and VVI?
    "VVI" seems to be more military See What is VVI in Aviation? and Vertical Speed Indicator This instrument has various other names like a "rate of climb descent indicator" In Europe, we use the local name for variometer, and "positive vario" is often part of the takeoff procedure to indicate the aircraft is airborne
  • Do hot air balloons have flight data recorders and cockpit voice . . .
    Per balloon regulations, they don't require certified CVR or FDR Hot air balloons don't have much in the way of instruments, traditionally just an altimeter and a variometer Today, they usually use a handheld-style GPS unit, which has its own recording capability, but isn't hardened like commercial FDR
  • Why are the cockpit controls of airplanes so complicated?
    The important difference between the variometers is that the left one is energy variometer (only used on gliders, indeed) while the right one is normal vertical speed indicator They show very different information (and note that they are labelled in different units too)
  • How is the wind direction and wind speed measured in flight?
    Indirectly, as the difference between true air speed and ground speed Since aircraft cannot measure true air speed, several steps are needed to arrive at the correct wind speed: The pitot tube (big aircraft have several of them) gives the stagnation pressure of the air, which is the sum of static and dynamic pressure The static ports (again, big aircraft have several of them) give the static
  • What instruments or avionics do balloons usually have?
    For normal sightseeing flights in a typical hot air balloon, what instruments or avionics does the pilot usually carry? Do balloons have a minimum equipment list?





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