CN CNi  



CNVario Manual Addendum – Release 3.6.4250 and later



Cruise Speed-to-Fly Options

The new Cruise Speed-to-Fly options are designed to allow the configuration of the CNvario to best support the pilot’s style of flying.

The CNvario determines the correct speed to fly (Target STF) from the glider polar, MC setting, wing loading and vertical airmass movement.  It is well known that chasing a varying STF number does not produce good results.  Most pilots prefer the vario to be quiet if they are flying more or less at the right speed.

The STF deadband width is now adjustable, giving the pilot control over how far his actual speed must be from the Target STF before the vario makes a noise.

The new STF Modes (Block or Classic) are not to be confused with Target STF audio.  The new modes give the pilot the option of overlaying their choice of Cruise Audio Mode (N, RN, TE) with speed-up and slow-down tones if they are flying too slow or too fast relative to the Target STF and the audio deadband width.

Classic STF mode compares the current IAS with the current Target STF and tells the pilot to speed-up or slow-down if the difference is big enough.  This mode helps the pilot follow the Target STF, but does not produce bothersome noises if his speed is “close enough”.

Block STF Mode supports the well known block speed-to-fly strategy adopted by many good pilots.  The pilot sets MC and wing loading which generates a still air STF.  The pilot is essentially saying he will fly at this speed unless vertical airmass movement is particularly good or bad.  The CNvario will now support this strategy by only telling the pilot to speed up or slow down if the Target STF is outside the selected deadband.  If the pilot is particularly good at flying block speeds, the CNvario will remain quiet most of the time!

The Cruise Speed-to-Fly option is selected on the Vario page of the CNvUtility.  The Cruise Audio deadband width can be adjusted in flight on the fourth screen to the right on the NavDisplay Flight Ribbon by selecting None, Narrow, Medium or Wide.  The corresponding speeds are shown on the screen.

The speed-up tone is a “bom-bom-bom…..) and the slow down tone a (bib-bip, bib-bip, bib-bip,…..).   These tones may be turned on or off in the CNvUtility.


Preempt Climb Option

When encountering rising air, and flying slowly enough (thinking of maybe thermalling?) the Preempt Climb Option will display a TE average on the flight screen over the Cruise average and switch the audio to TE.  This is helpful in making the climb or continue on cruising decision.


Thermal Map Page

When thermalling and viewing the Thermal Assistant screen (to the right of the Flight Screen), a thermal map is available by pressing the Up or Down arrow.  This is especially useful when low attempting to center elusive lift.

Pressing GO when on this screen enables map configuration which includes map scale (zoom) and orientation (track up, N up, or goal up).  The up and down arrows are used to make the desired selection, and pressing GO again advances to the next configuration choice.


Enable Climb Mode

When cruising and viewing the NavDisplay flight screen, momentary climb mode may be initiated by pressing the left arrow, and forced climb mode may be initiated by a press and hold of the left arrow.  Returning to cruise from a forced climb mode requires another press and hold of the left arrow.

Circle Average

The 20 second climb average has now been changed to a full 360deg climb average.  This provides a more stable climb average which helps centering.


Low Voltage Warning

A low voltage warning threshold may be set on the voltage/voltage warning screen at the far right of the Tools Ribbon using the up or down arrow.  This is especially useful for LFP batteries.

Copyright©  ClearNav Inc.
2668 Husted Road Williams, CA  95987  USA
Phone: 530-473-5600