C3 variometer booklet
Contents
1. Launch The C3 will enter speed to fly mode during the aerotow the circle symbol will be extinguished Climb mode with glide calculator set to start When you slow down below 52 kts after release the C3 will automatically change to climb mode Climb and sink tones will be heard from the audio The cursor will automatically jump to Arrival height The screen will look something like this Pseudo vario pointer Circle symbol indicating climb mode 20 second digital averager in knots Tendency arrow showing if thermal is improving or decaying 1 2 or 3 Glide path arrows showing 50 ft above below final glide slope per arrow Cursor point showing what will be displayed on the 5 digit line The 4 digit line shows height in feet x 10 above below glide slope for pre set arrival safety height at the waypoint selected on the GPS A minus sign will be illuminated if below glide The 5 digit line shows pre set arrival or safety height at destination set at 95 x 10 feet Notes In this case you are in climb mode The averager shows a climb rate of 4 7 knots The thermal is tending to decay You are 530 ft above glide slope for destination Your pre set arrival safety height is 950 ft Your actual arrival height at destination will be the sum of the pre set arrival or safety height plus or minus the value shown on the 4 digit line Beware the minus sign In this case you are likely to arrive at 148 x 10 feet The curs2. 50 feet Three up arrows means you are at last 150 feet above final glide slope The actual height above below glide path is shown on the 4 segment display Cursor Switch moving the cursor upwards v moving the cursor downwards Using the cursor switch you can move the cursor to the desired position To get from one side to the other you just step over the last item at the top or the bottom and the cursor jumps to the other side Pressing the cursor and the plus minus switch down together resets the cursor back to the top right of the display Vol Plus Minus Switch increases the displayed value decreases the displayed value The plus minus switch enables you to change the value of the items you choose with the cursor To decrease the value you press the switch down to To increase the value you lift the switch to If you hold down the switch the value will change continuously Note you can make entries faster than the processor can handle and overshoot your requirement be patient LETS GO FLYING We will assume that the basic set up has not been interfered with that KJJ has 20m tips fitted that no water ballast loaded and that the crew are two well fed pilots The following routine will give you all that you need from the instrument with the minimum of user input Firstly start up the GPS Put aircraft master switch to on Switch on the GPS instrument by pressing and holding the red button for
3. a few seconds The GPS may give a warning on land data if so press enter to acknowledge Wait for the GPS to acquire satellites and to locate itself The GPS will switch from the satellite screen to one of the navigation screens Press GOTO and check that BELA for Bellarena is the active waypoint If not use the large rocker button to scroll down to BELA and press enter Use large rocker button to highlight ok and press enter If the screen shows a map on the left and four data points on the right then setup is complete Otherwise press page repeatedly until the required page is displayed The required screen layout will look like this Map area Speed Distance Vv Bearing Pointer showing position and heading on map Track The map area will outline major roads coastlines lakes towns and user defined waypoints It does not show any air space data Your position is indicated by a pointer at the centre of the map Your current track is indicated by the direction of the arrow The map is orientated north up and will scroll up down and left right as required leaving your position at the centre Speed This will indicate your speed over the ground in knots Distance This will indicate the distance in nautical miles to the selected waypoint and this will be sent to the C3 for the final glide calculations Bearing This indicates the true bearing from your present position to the selected wa
4. l Automatic wind setting WIND A WINDM Oort O 1l y l i CO Setting for analogue instrument 0 1 2 3 0r4 Cursor point for specific switch C FIX 0 to 13 combinations Cursor point for speed to fly setting 0 to 13 Cursor point for vario setting 0 to 13 Vario speed to fly change over via GPS VS GPS N B Individuals should not attempt to change the basic setup without prior approval of the CFI This is a flight safety issue The foregoing is given as a reference for restoring lost settings however the C3 retains all these basic settings even if the power is disconnected 18 2 58 52 20 1 2 2 6 1 2 2 6 10 11 3 N A 1 1 4 1 4 5 13
5. not purport to be an authoritative user manual It aims to present the minimum amount of information you need in order to understand basic use of the instrument with an attached GPS to soar at Bellarena and to use the final glide calculator to help you return to Bellarena safely Some elements of the manufacturer s manual are reproduced here and that manual can be seen in full on the manufacturer s web site Some important notes e Please take care when boarding or vacating to avoid breaking the C3 switchgear with your boots e The instrument has been set up to display speeds in knots height in feet and distances in nautical miles except analogue dials that remain in m sec e Until we have time to install manual switches the changeover between vario mode and speed to fly mode is executed automatically by the C3 and is related to airspeed If you have any queries please ask T Snoddy THE DISPLAY The C3 has a multi function LCD screen This diagram shows the layout of the display and all possible elements Note that only certain elements are illuminated at one time as appropriate Vario climb mode circle indicator Circular vario in climb mode and speed to fly director in cruise mode Tendency arrows Averager in climb mode netto air mass in cruise Glide path arrows above glide slope Selected cursor point Cursor points Wiri i Battery warning Glide path arrows feie m m below g
6. true at 18 knots The cursor may be moved to any other cursor point to display different information on the 5 digit line In certain cases the information on the 4 digit line will also change See chart In speed to fly mode the analogue dial will show air mass in m sec THE VOLUME KNOB An external volume knob has been fitted to the rear panel This enables the instructor to turn the audio volume up and down quite easily as and when required To enable use of this knob you should leave the volume setting on the instrument at 100 If the glider is to be flown solo the volume knob on the rear panel should be left at maximum full clockwise and the volume can be regulated in flight by means of the cursor control and control on the front panel in the normal manner For solo flying the rear unit does is not need to be active THE ANALOGUE DIALS The analogue dials are programmed to indicate as follows In climb mode normal total energy vario In speed to fly mode netto or air mass movements These dials are calibrated in metres second 1 m sec approx 2 knots Beware When showing netto or air mass in speed to fly mode the analogue dial shows air mass movements not climb and sink of the glider If you encounter air that is physically rising at 1 knot or 0 5 m sec the analogue dial will show this positive up value but the altimeter will not be impressed This feature informs you of what the air is doing regardless o
7. PILOT NOTES FOR THE C3 VARIOMETER INSTALLED IN KJJ The C3 offers a standard up down audio vario just like an XK10 plus A digital averager A speed to fly director with audio A netto air mass vario in speed to fly mode Automatic switching between climb and speed to fly modes A self contained pressure transducer digital altimeter A final glide calculator with graphic numeric display Easy in flight adjustments for L D ballast bugs and Mc Cready User adjustable settings for a host of parameters Automatic recording of statistics for the last three flights When connected to a separate GPS receiver it can e Take distance information from the GPS e Calculate wind strength and direction from GPS derived drift measurements e Provide final glide calculations to destination including around turning points The instrument may seem to be complicated however it has been configured to suit KJJ and if used in the manner advised herein it is almost as easy to use as an XK10 You simply switch on and go The instrument offers numerous configurations and options to suit the glider in which it is installed and to satisfy the personal preference of the pilot It is clearly not practical to have every pilot in the club making changes to the setup and to the type of information to be displayed In the interests of flight safety the CFI insists that individuals should not alter any of the basic settings without prior approval This document does
8. at the bottom of the screen a countdown begins AUS 9 0 and the C3 switches off If the switch is moved to position 1 or 2 before the countdown is complete the C3 will resume operation After switching on again all previous settings are restored e g height if C3 is set to QFE Vario Speed to Fly Switch Vario vario mode Auto automatic switch from vario to speed to fly mode Use this position for normal use Sollf speed to fly mode The Vario Speed to Fly switch enables you to choose between a vario or a speed to fly indicator being optically displayed on your C3 with acoustic information from your loudspeaker In the vario position a vario will be displayed on your C3 In the Sollf Position a speed to fly indicator will be displayed In the Auto position the C3 switches automatically from vario to speed to fly and vice versa The criteria for switching can be given on the one hand by flying faster than a certain air speed vario will be switched off and speed to fly indicator on or by flying slower than a certain airspeed vario will be switched on and speed to fly indicator off or on the other hand by using a pilot operated external switch yet to be fitted Start Stop Switch Stop flight computer stopped height is generally shown on the 4 segment display but will vary with cursor position Start flight computer started the final glide calculator begins to work The glide path arrows become active each arrow
9. easonable time 4 digit line QFE in millibars Hp QFE in millibars Hp 5 digit line Altitude feet x 10 Altitude feet x 10 12 BASIC SETUP The C3 has been configured by entering values and making choices as follows ITEM Screen contrast KONTR O0to30 8 Polar curve standard class POLAR 4 2 304 Compensation KOMP___ 25t0o 125 CT External vario speed to fly switch WOELB loov o0 Auto change from vario to speed to fly V OFF_ Knos 58 Auto change from speed to fly to vario V ON_ Knots 52 Average of numeric vario INTEG Seconds 20 Vario delay 1 VAR1 Seconds 12 Vario delay 2 VAR2 Seconds Speed to fly delay 1 SOL1 Seconds Speed to fly delay 2 SOL2 Seconds 26 Average of netto vario NETTO Seconds 10 Low battery warning BAT S sf Volts TT Temperature adjustment Frequency pitch FREQ _ 10to 10 CCT Broken tone TAKT _ 10to 10 6l Auto volume control ALAUT 0 1 2 3 4 o0r5 3 English or metric units Tendency arrows TEND _ _ Ft mn FS SCO Pressure DRUCK _ HPa NA ndicated airspeed ias i Ks SCC Dead band on speed to fl S NUL sf Ftimin ST 8 Altimeter setting at switching on C3 QFE QNH 0o11 1 Glide path G amp PFAD 0o11 SCT 1l Type of analogue instrument A TYPE 0o11 Y fol Zero on analogue instrument ANUL 50to 50 CT Maximum on analogue instrument A MAX_ Percent 89 V f y
10. f the speed of the glider N B If you put the C3 into speed to fly mode on the ground the analogue dials will show a positive value This is not a fault ACOUSTICS The acoustic tone works in vario mode from 20 to 20 kts The sink acoustic is a continuous tone In climb the acoustic is a continuous and broken tone In speed to fly mode flying too fast is a continuous and broken tone Flying too slowly is a continuous tone 10 THE REAR SEAT REPEATER UNIT The rear seat control unit is fitted with three switches only All cursor items and basic set up options are configurable from the rear seat It addition it is possible to have a different cursor item selected in the rear and thereby have different information displayed on the 5 segment display of the rear unit Display choices made on the rear unit will not change the front unit however all changes to volume glide angle wing loading McCready arrival height altimeter sub scale and any of the basic setup items will be changed on the main unit and will be used in calculations Note that on the rear unit the left hand Switch the power switch is used only for entering setup and statistics modes it will not power up or switch off the main front unit Instructors must set the three left most switches on the front unit before boarding SWITCHING OFF When you wish to switch off the unit you should move switch on the front unit to 0 and allow the C3 to shut down over a period
11. he value may be made with the switch Volume L D WIL Height Wind Arrival Height Temp Mc Cread Average er 1 Veto Steet A AE Z E E 2 Salf Stop w Aver speed Shows you the average speed on the leg you are flying This value is set to 0 at switch on Waypoint Will indicate WP GPS showing that distance information is taken from the GPS Distance The distance being used in the final glide calculation If the GPS is in GOTO mode it will be the distance to the active waypoint If in route mode then the distance to final destination Wind If the GPS is active and you have flown a circle recently the wind direction and strength will be shown Otherwise you may see WIND M and you may use the switch to enter a head wind as negative or tail wind as positive value Arrival height Shows the required arrival height at the way point destination This has been set at 950 feet shown as 95 ft x 10 Volume With Vol you regulate the volume of the vario tones The volume will increase automatically as you fly faster See later note concerning the external volume knob L D This shows the anticipated glide angle GZ For KJJ with 20m tips use 44 In 18 metre mode use 40 A quick in flight correction e g for bugs on wing is possible WIL Shows the wing loading GF in kilos per square metre This has been entered as 35 kgs sq m for KJJ in 20m mode assuming two well fed pilots and no water ballast U
12. lide slope Hanh Fe ee 4 segment display of EN altimeter line 5 Segment display of chosen cursor position ELEMENTS OF THE DISPLAY In vario the circular display shows the vario value A petal displayed in the upper half means you are climbing and a lower half display means you are descending In vario mode it displays a vario At a climb rate of 5 m s 10 kts all the arrows are visible at a climb above 10 kts the arrows start to disappear from the middle up to a maximum of 20kts where only the last arrow Stays visible Descending is the reverse procedure In speed to fly mode it displays an optical speed to fly indicator Upward pointing arrows when you are flying too fast and downward pointing arrows when you are flying too slowly The circle symbol is visible when you are in vario mode and an average value is displayed numerically In speed to fly mode a netto air mass value is displayed numerically When the supply voltage falls below the preset danger level the battery warning becomes visible In the 4 segment display the altitude final glide information or other data is displayed according to the cursor position and setting of switch 3 See table In the 5 segment display the value of the chosen cursor item is shown CURSOR ITEMS The information displayed on the 5 segment line is controlled by positioning the cursor at one of the cursor points Where user input is appropriate changes to t
13. of 10 seconds You will see the 10 seconds counting down on the 5 digit line This ensures that the statistics of the last three flights are preserved in memory If you switch off via the aircraft master switch or just remove the aircraft battery the stored data will be corrupted If the unit is accidentally switched off in flight the audio will emit a high pitch tone while it counts down to off Do not misinterpret this as the thermal of the year Restoring the switch to 1 or 2 before the C3 has counted down to 0 will return the unit to normal operation When the aircraft power is switched off via the master switch the GPS will switch to its own internal battery power To avoid running down these batteries switch off the GPS by pressing and holding the red button until the screen goes blank 11 INFORMATION DISPLAYED ON THE 4 amp 5 DIGIT LINES This table outlines the different items of information that can appear on the 4 amp 5 digit lines according to cursor position and setting of glide calculator switch Cursor point Display Glide calculator at STOP Glide calculator at START a Sara ee ee ee ee Altitude feet x 10 Height above below glide slope ft x10 Aver Speed 5 digit line Average speed Average speed 4 digit line Altitude feet x 10 Height above below glide slope ft x10 Waypoint 5 digit line WP GPS WP GPS 4 digit line Altitude feet x 10 Height above below glide slope ft x10 Distance 5 digit line Distance to wa
14. or may be moved to any other cursor point to display different information on the 5 digit line In certain cases the information on the 4 digit line will also change See chart In vario mode the analogue dials will present a standard total energy vario display in m sec Speed to fly mode with glide calculator set to start When you increase speed above 58 kts the C3 will automatically change to cruise mode Speed to fly tones will be heard from the audio The cursor will automatically jump to Wind The screen will look something like this Pseudo pointer now giving speed to fly directions Pointer up pull up slow down pointer down nose down speed up There is an audio dead band over a range when the speed is about right Note Circle symbol is extinguished Netto air mass display in knots minus shown hen the air is sinking 1 2 or 3 Glide path arrows showing 50 ft above below final glide slope per arrow Cursor point showing what will be displayed on the digit line The 4 digit line shows height in feet x 10 above below glide slope for pre programmed arrival or safety height at the waypoint selected on the GPS Minus sign is displayed if below glide Five digit line shows wind 180 degrees at 18 knots Notes In this case you are in cruise mode You are being advised to slow down The surrounding air is rising at 1 7 knots You are 53 x 10 feet above the required glide slope The wind is from 180 degrees
15. se 37 kgs sq m for 18 metre mode Height When the instrument is switched on the altimeter automatically shows QFE 0 feet Bat Shows battery voltage Temp Shows outside temperature from a probe in the front vent which must be open to enable accurate readings McCready Will show 0 at switch on Set a suitable McCready value if required Average climb Shows the value of the last thermal used Thermal is defined as the time from switching from speed to fly mode to vario mode and then switching back again from vario mode to speed to fly mode This value will be less than the average shown over 20 seconds The value is set to 0 at switch on Note Switching on the instrument puts the following values to 0 average speed wind McCready and average climb The cursor point is set to volume DESCRIPTION OF SWITCHES FROM LEFT TO RIGHT Power Switch Arrival Height 1 C3 switched on with vario and speed to fly delay 1 Use this position for normal use 0 C3 switches off after 9 seconds 2 C3 switched on with vario and speed to fly delay 2 When the power switch is in the middle position 0 the C3 is switched off but it does not switch off immediately It shows AUS on the display and after 9 seconds it switches off totally If the power switch is returned to 1or 2 before the expiry of 9 seconds the C3 is switched on Note If the C3 is accidentally switched off in flight a loud audible warning is sounded and
16. ypoint Track This indicates your current true track over the ground Making the track reading equal the bearing reading will ensure that you travel straight towards the selected waypoint If the track is less than the bearing then turn right if the track is more than the bearing then turn left Note When stationary the pointer heading and track information is erroneous Now start up the C3 Move the 1 0 2 leftmost power switch upwards on the front panel unit The C3 will take a few seconds to start The 5 digit line will briefly say WP GPS to indicate that it is receiving distance information from the GPS The digital altimeter will be set to zero QFE and will subsequently indicate height above airfield level Note that the height is displayed in tens of feet Climb mode will be set The circle symbol will be visible Ensure that the vario speed to fly switch on the front unit is set to Auto Move the centre switch on the front unit to Start to enable the final glide calculator Further inputs may be made from either front or rear panel units The cursor will be at Vol You may adjust the audio volume as required by the switch See later note on volume control The volume will increase automatically as you fly faster If necessary place the cursor at L D check that the 5 digit line reads GZ 44 If necessary move the cursor to W L check that the 5 digit line reads GF 35 Set a Mc Cready value if required
17. ypoint destination Distance to waypoint destination derived from the attached GPS 4 digit line Wind component on track Height above below glide slope ft x10 Wind 5 digit line Wind direction and strength Wind direction and strength If GPS active and circle flown If GPS active and circle flown recently Not active on ground recently Not active on ground 4 digit line Altitude feet x 10 Height above below glide slope ft x10 Arrival height 5 digit line Safety height 95 ft x 10 Safety arrival height 95 ft x 10 4 digit line Altitude feet x 10 Height above below glide slope ft x10 Volume 5 digit line Volume Volume red roe ees L D 5 digit line Glide angle GZ Glide angle GZ 5 digit line Wing loading in kgs sq metre GF Wing loading in kgs sq metre GF 4 digit line Altitude feet x 10 Height above below glide slope ft x10 5 digit line Battery volts Battery volts Temp 4 digit line Altitude feet x 10 Height above below glide slope ft x10 5 digit line External temperature vent open External temperature vent open 4 digit line Altitude feet x 100 Height above below glide slope ft x10 McCready 5 digit line Mc Cready setting Mc Cready setting 4 digit line Altitude feet x 10 Height above below glide slope ft x10 Average Climb 5 digit line Average rate of climb last thermal Average rate of climb last thermal Wind information is conditional upon the glider being in flight the GPS having acquired position and a circle having been flown within a r
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