The ClearNav Instruments vario system has been designed to provide glider pilots with the best possible climb and speed-to-fly guidance, as well as valuable secondary information, including wind speed and direction, air and ground speeds, and altitudes.
The vario can use either probe or purely electronic Total Energy compensation. It fits into a single 57 MM hole and the “black box” (Air Data Computer or “ADC”) can mount either directly to the display module or separately for maximum flexibility.
The vario has been designed to be fully compatible with the “ClearNav” display and, through the use of a serial data port, can also integrate with other moving map/glideslope devices. Go to CNv Vario Features for details.
Both types, the mechanical pointer and digital display offer state-of-the-art total energy variometry for climb and cruise. High performance pressure transducers and advanced digital filtering yield rapid, but well damped response.
Feedback from our customers confirms that the vario has an uncanny ability to respond to lift without the frequent false alarms which plague other fast varios.
A highly visible mechanical pointer responds rapidly and smoothly to glider vertical motions, and a high resolution digital display shows both a short-period average rate of climb, and the average since the climb began.
Audio tones allow for centering without reference to the display.
Both models provide netto and speed to fly information and both are extensively user-configurable to accommodate any sailplane and any pilot preference.
Speed-to-Fly information is presented by visual display, audio tones or both.
Other features common to both models are a unique “Get Home” screen which provides navigation and glideslope information to the home field, winds (headwind/tailwind and vector wind) and electronic Total Energy options.
A simple user interface and a profile editor make the products both easy to use and easy to configure
The Cross Country model adds: a secure flight recorder, navigation to a point in a waypoint database, serial communications to both the ClearNav flight Computer and other third part devices.
We have chosen a particularly simple UI which is easy to learn and hard to forget. There are two rotary knobs, one (at the top left) selects which screen is displayed (Cruise/Climb, MacCready, wind, etc). The other (at the bottom right) changes the value of a number on the selected screen (such as MC, altimeter setting, ballast, pointer time constants etc). For screens presenting multiple choices (such as flight logs, profiles etc) the knob highlights the active choice. Display screens are grouped to simplify their use: Flying Screens are used for items most commonly needed in flight, Settings Screens are typically used on the ground and are seldom used in flight, and Tools and Information screens are reserved for items which are not frequently used.
In general there is no “set/acknowledge” function – after a parameter is changed it remains at its new value on paging away to another screen.
Almost all set values are “sticky” – once set they remain as set until set again. Generally the stickiness is indefinite. Some parameters, such as MC, bugs and ballast, are reset to default values when the vario is turned on the next day.
If the vario is connected to a ClearNav display, MC, bugs, and ballast values are synchronized and tasks created using the ClearNav display may be copied to the vario. Copying a task to the vario gives the pilot a completely independent navigation and task management option as a backup.
Audio and pointer give fast Total Energy feedback to the pilot and the climb screen has two averagers for longer term assessment of climb:
The “smart” 20 second digital averager (top right) is a filtered average climb rate. On the transition from cruise to climb this averager is reset. It initially shows the one second average, then the two second average etc until at twenty seconds and longer it shows the twenty second moving average.
A second averager (bottom right) shows the average climb for the current thermal from the start of the climb to now. This value is just the change in total energy divided by elapsed time since the start of the climb. Both averagers have associated timers (top left and bottom left).
The winds screen shows headwind/tailwind component (left) and vector wind (lower right). The arrow (top center) shows the direction of the wind relative to the nose of the aircraft.
Electronic Total Energy
“Electronic” Total Energy does not make use of a Total Energy probe but uses the pitot and static pressures instead. This allows the vario to be used in gliders not equipped with a Total Energy probe. The electronic Total Energy system may also be used in conjunction with a Total Energy probe to make adjustments to the probe response. This can be very useful for Total Energy probes with under-compensation behavior
Two levels of task management exist. The simplest allows a third party device to export a declaration (including the task and its control points) to the Secure Flight Recorder. Normally the task would be managed automatically so that after the start the active waypoint becomes the first task control point etc. We also provide a task screen which gives the pilot the ability to select the active waypoint using the lower right encoder.
It is also possible to export waypoint databases to the vario using the Profile Editor and a USB drive. If a waypoint database is present then there are additional options, including the ability to select landpoints ranked by distance:
Using the all-control-points option it is possible to manage any task quite independently. This provides a valuable backup in the event of a primary nav failure.