SDI C4 COMPETITION User manual

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
Version 4.05 01.03.2004
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1.0 INTRODUCTION 2
2.0 DESCRIPTION OF CONTROLS 2
3.0LIQUID CRYSTAL DISPLAY 3 
3.1 ELEMENTS OF THE DISPLAY 3
3.2 CURSOR POINTS 4
3.3 DESCRIPTION OF CURSOR POINTS 4
3.4 CIRCULAR DISPLAY FOR VARIO OR SPEED TO FLY MODE 7
3.4.1 CIRCULAR DISPLAY IN VARIO MODE 7
3.4.2 CIRCULAR DISPLAY IN SPEED TO FLY MODE 7
3.5 FOUR DIGIT HEIGHT DISPLAY 8
3.5.1 HEIGHT AND HEIGHT DIFFERENCE DISPLAY IN VARIO MODE 8
3.5.2 HEIGHT DISPLAY IN SPEED TO FLY MODE 8
3.5.3 SPEED TO FLY DISPLAY 8
4.0 GPS INTERFACE 9
4.1 WIND DISPLAY WITH GPS INTERFACE 9
5.0 CHANGE FROM VARIO TO SPEED TO FLY 10
5.2 VARIO/SPEED TO FLY VIA FLAPS OR STICK SWITCH 10
5.3 VARIO/SPEED TO FLY VIA SPEED CONTROL 10
5.4 VARIO/SPEED TO FLY VIA GPS 10
5.4.1 CHANGE OVER FROM SPEED TO FLY TO VARIO VIA GPS 10
5.4.2 CHANGE OVER FROM VARIO TO SPEED TO FLY VIA GPS 10
6.0 CALCULATING YOUR SPECIAL POLARS 10
6.1 ESTABLISHING THE POLAR VALUES 10
6.2 CALCULATING THE POLAR COEFFICIENTS 11
6.3 ENTERING POLAR COEFFICIENTS 11
7.0 OPTIMISED CURSOR MOVEMENT 12
8.0 ACOUSTICS 12
9.0 SETUP 13
9.1 ITEMS IN SETUP
13
9.2 EXPLANATION OF SETUP 14
10. THE FIRST FLIGHT 15
10.1 SWITCHING ON AND OFF 16
10.2. THE POLAR OF YOUR GLIDER IN SETUP 16
10.2.1 FINAL ADJUSTMENT OF POLAR 16
10.3 COMPENSATION 16
10.3.1 COMPENSATION AND THE C4 COMPETITION 16
10.4 VARIO DISPLAY 16
10.5 DIRTY WING POLARS 16
10.6 SPEED TO FLY 17
11.0 INSTALLATION 17
11.1 MECHANICAL INSTALLATION 17
11.2 ELECTRICAL INSTALLATION 17
11.2.1 DESCRIPTION OF ELECTRICAL CONNECTIONS 17
11.2.2 DIE STECKERBELEGUNG WITH KABELFARBEN PATCHKABEL (RJ45) 18
11.3 GPS INTERFACE 18
11.4 PNEUMATIC FITTING 19
12.0 TECHNICAL DATA (SPECIFICATIONS) 19
13.0 GUARANTEE 19
14.0 DEVELOPMENT AND SALES 20
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C4 COMPETITION Handbook SDI Franz Pöschl GmbH
Version 4.05 01.03.2004
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1.0 Introduction
Dear glider pilot,
You are now the proud owner of a modern flight computer. The C4 Competition is well proven and
operates with optimum efficiency.
The following changes from version 3.01 have taken place;
♦simple change over from metres to feet
♦new vario characteristics – very fast and steady
♦two vario scales; 2.5 and 5 m/s or 5 and 10 feet/sec
♦new final glide calculation via laid off turning point to goal
♦new flight statistics with displays of average speed over the last 30 minutes and the last 2 hours
2.0 Description of controls
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♦The label on the ON/OFF switch shows that the switch has several functions.
♦When switching on press the ON/OFF switch until the display appears, then you’ll see a version
number appear for a few seconds; this is the software version of your C4 Competition.
Now you must enter QNH and confirm it with the OK switch.
♦When switching off press the ON/OFF switch until OFF 9 appears. After that a countdown takes
place and after showing OFF 0, the C4 Competition switches off.
♦You choose the required cursor point with the left rotary knob. The right rotary knob allows you to
change the values of the chosen cursor point and to leaf through Info when this cursor point has
been chosen (flight statistics). The cursor point you have chosen is shown on the 5 digit display.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
Version 4.05 01.03.2004
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3.0 The Liquid Crystal Display
A special liquid crystal display was developed for the C4 Competition which provides good contrast
over a wide range of temperatures to allow reading in all light conditions.
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3.1. Elements of the display
♦The circular petal display shows vario and speed to fly values.
Vario display Speed to fly display
♦The circular symbol shows you are in vario mode. When in speed to fly mode the symbol dis-
appears.
♦The 2.5 digit display 0.9 shows average climb in vario mode and is a netto vario in speed to fly
mode. (The netto vario shows the vertical movement of the air mass minus the sink rate of the
glider.)
♦The tendency arrows above and below the 2.5 digit display show whether thermal strength is
increasing or decreasing and is a useful aid for centering.
♦If the battery voltage falls below the voltage set in the setup menu then BAT flashes.
♦The 4 digit altimeter 4260 displays altitude.
♦The 5 digit display 138:35 shows the chosen cursor point. (Further information about this under
3.3.)
♦The glide path arrows show if you are above or below glide path. The arrows divide into three
with each division showing the deviation from the glide path (above or below) in steps of 50 me-
tres.
♦The sign Soft shows when you are in SETUP.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
Version 4.05 01.03.2004
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3.2 The cursor points
3.3 Description of cursor points
The framing of the four digit height display and the five digit cursor display is used to highlight the cho-
sen cursor point.
When switching on the C4 COMPETITION the Wind, Mc.Cready value and all values in the Info-
Menu are set to 0.
♦At NAV you can call up the various displays for navigation.
♦At Goto you can call up the various displays for final glide.
♦Distances are taken automatically from the GPS or logger and shown under Distance.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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♦From the GPS interface you receive precise information about the wind. In vario mode the wind
direction and strength is displayed. In speed to fly mode the wind component is shown in addition
to the direction and strength. You may see, for example, 216:45, then C: - 45.
♦If the cursor is set on A.H. (arrival height), the set arrival height (750m) of the next waypoint or goal
appears for 5 seconds in the four digit display. In the five digit display you see the calculated arrival
height (1645m) of the next waypoint.
♦With Vol. you alter volume strength from 0 to 100.
♦Glide angle, L/D, is used to set your polar precisely. Enter the best glide angle of your glider. The
polar can be changed during flight if necessary (e.g. dirty wings from insects). In flight, in addition
to the set L/D (1:50 right) the achieved L/D is shown (1:52 left).
♦Enter your wing loading for the day at W/L. Wing loading is always in kilos per metre squared. You
can change the wing loading value in flight.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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♦With QNH you can set your altimeter to the desired pressure. The four digit display shows pres-
sure in hPa and the five digit display shows altitude.
♦Batt. displays the voltage of your battery.
♦Temp. shows the temperature at the temperature probe (cable 1).
♦A.Climb/McCready shows the average strength of the last thermal and, at the same time, you can
set a suitable McCready value. The average thermal strength is calculated using the total time
spent in the thermal. The change over point from speed to fly to vario is used as a measuring cri-
terion.
♦Info displays the average speed over the last half hour and over the last two hours. You can enter
the set up menu when SETUP is displayed.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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3.4. The circular petal display for vario and speed to fly
The petal display provides an optical display of values for vario and speed to fly modes. A special fea-
ture is the vario display range.
eg. 5m/s climb eg.10m/s climb
The circular petal display of the C4 has a double display image. At the beginning the display fills from
0–5m/s followed by the emptying of the display area from 5–10m/s.
3.4.1 The circular petal display in vario mode
In vario mode the display can be set to 0-5m/s or 5-10m/s. You can change between them by putting
the cursor to A.Climb/McCready and pressing OK. After the change over you will see the chosen vario
range displayed for a few seconds.
Range 2.5–5m/s Range 5–10m/s
The non-linear display shows the vario values well. Nearer to 0 the vario becomes more sensitive.
With an additional analogue vario the values are presented in a linear display. The digital display to the
right of the circular petal display shows the vario average, taking into consideration the set time con-
stant.
3.4.2 The circular petal display in speed to fly mode
In speed to fly mode the circular petal display shows the speed deviation from speed to fly. Flying too
fast is shown by petals above 0 and flying too slowly is shown by petals below 0. Every petal change
(excluding the central one) shows a deviation of 4km/h from speed to fly.
20km/h too fast 20km/h too slow
The digital display to the right of the circular petal display shows the netto vario average, taking into
consideration the set time constant. Flying straight the netto vario shows the movement of the air mi-
nus the sink of the glider.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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3.5 The four digit height display
The four digit altimeter display is used to show different heights.
♦An altimeter (QNH) and height difference in vario mode
♦An altimeter (QNH) in speed to fly mode
♦Height above or below glide path during final glide
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Info: You can change the altimeter between metres and feet by putting the cursor to QNH and pressing
OK.
3.5.1 Height and height difference in vario mode
In vario mode and by choosing FG:OFF the four digit display operates as a precise altimeter that is set
to QNH. When H:G.VAR is put at 1 in Setup, the four digit display shows height gain or loss in vario
mode – after the change over from speed to fly to vario mode.
3.5.2 The altimeter in speed to fly mode
In speed to fly mode and when using FG: OFF the four digit display operates as a precise altimeter
that is set to QNH.
3.5.3 Glide path display
If you have chosen FG:WP or FG:RTE in the Goto menu, you get a glide path display instead of the
height display. In addition, on the left, you see several glide path arrows. These arrows appear in
vario and speed to fly mode. The arrow symbol divides into 3 arrows up or down. Each arrow repre-
sents a height of 50m.
The speed to fly glide path is the glide path to goal or waypoint and takes into consideration set polar,
set glide angle, wing loading, distance, McCready value, wind and set arrival height. If you call up
FG:WP or FG:RTE on Goto, the cursor jumps automatically to A.H. after 5 seconds and waits for con-
firmation or change of the required arrival height AH-WP or AH-FI. AH-WP is the chosen arrival height
at the next waypoint and AH-FI the arrival height at goal.
A C4 linked to a PosiGraph from SDI, takes the arrival height from the PosiGraph, assuming that a
height for this waypoint has been set in the PosiGraph. You can change this height if you wish. When
no height is given a standard height of 400 metres is used. This value can also be altered.
The arrival height will be used after you have pressed OK. If you want to change the arrival height
again later, then put the cursor to A.H. and press OK. Now you can alter the height. The new arrival
height set will be used when you press OK again.
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C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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Glide path to next waypoint FG: WP
Final glide with FG: RTE with a laid off waypoint to goal
Next waypoint
Goal
Warning: Final glide with FG: RTE only functions with a laid off waypoint before goal. Otherwise you
will get a message NOT: FI and 8888 on the altimeter.
If your goal is another airfield, the setting of QNH is important for final glide because glide path calcu-
lation for final glide is not complete without it. The setting of QNH should therefore be checked before
final glide.
4.0 The GPS Interface
The C4-GPS interface allows you to concentrate on flying and provides you with the following useful
information.
♦wind component on each leg
♦wind component for glide path calculations
♦wind direction and strength
♦distance to a waypoint or for the whole route
♦navigation data
♦altitude of goal – only when linked to a PosiGraph
The C4 can be connected to nearly every GPS system with a standard NMEA 0183 output (we rec-
ommend, for example, PosiGraph, GARMIN).
4.1 The wind display with a GPS Interface
A GPS interface enables calculations about wind to be made. In vario mode when a change of direc-
tion takes pace such as centering weaving and figures of eight etc. the wind direction and strength is
displayed. 045:30 (45 degrees - 30km/h). In speed to fly mode and flying straight ahead the wind com-
ponent along your flight path is shown C:-15 (headwind 15km/h). The automatic wind calculations are
fed directly into the glide path calculations.
Unlike other systems, the C4 only uses data for wind calculation provided by the GPS. Mistakes aris-
ing from the use of faulty compasses are therefore avoided.
045:30
C:-15
or
045:30
After a few
minutes
045:30

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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5.0 Change over from vario to speed to fly
There are four options for changing from vario to speed to fly.
♦flap switch
♦switch on the stick
♦speed determined
♦GPS controlled
5.2 Vario/speed to fly change over via flaps or stick switch
For connection to flaps or stick use the lead provided on the number 2 cable. In Setup you have to set
VS: SW to 1or -1, depending on the type of switch you are using.
5.3 Vario/speed to fly change over – speed controlled
To activate the vario/speed to fly change over via speed you have to set VS: SW to 0 in Setup.
The speeds for the change over are chosen in Setup with VS: VOF and VS: VON. VS: VOF is the
speed when vario changes to speed to fly and VS: VON is the speed when speed to fly changes to
vario.
5.4 GPS controlled vario/speed to fly change over
The GPS controlled change over uses the data supplied by the GPS, speed over ground, vario and set
McCready.
5.4.1 GPS controlled change over from speed to fly to vario
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♦The speed to fly/vario change over takes place
between 90°and 270°if the vario value is greater
than the set McCready value.
♦The speed to fly/vario change over takes place
between 180°and 360°if the vario value is less
than the set McCready value and the circle is
completed in less than 30 seconds.
5.4.2 GPS controlled change over from vario to speed to fly
The vario/speed to fly change over takes place within 10 seconds if your change of direction is less
than 30°.
6.0 Calculating your individual polars
6.1 Establishing the polar values
To establish your special polar you need a few values from the speed polar of your glider;
1. speed at minimum sink (V1) and the minimum sink (W1),
2. speed (V2) at 150km/h sink (W2) at 150km/h.
3. If your sink polar is very flat, take the speed (V2) and the corresponding sink (W2) from the upper
speed area of your glider polar.
Speed polar (L/D) for the ASW 19 (V1=80km/h, W1=0.7m/s, V2=240km/h, W2=6.7m/s)
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90°
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270
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180
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C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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6.2 Calculating polar coefficients
Polar curve: ASW19, G/F (W/L 33.3kp/m2)
6.3 Entering the polar coefficients into the C4
To enter the polar coefficients the calculated values (a) and (c) have to be altered a little.
Calculated polar coefficient Change Ready for entry in Setup menu
a - 0.00092 multiplied by (- 1 000 000 ) 920 P5-A
c - 7.62 multiplied by (- 1 000 ) 7620 P5-C
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C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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7 Optimal cursor movement
The optimised cursor movement allows you to pre-set cursor points which are often used during flight.
They are automatically selected when circling and flying straight ahead.
The setting of these points is done in Setup. The cursor points are numbered from 1 to 13. The num-
bers are for setting purposes only and do not appear on the display.
Virtual num-
ber Cursor point
1 Nav.
2 Goto
3 Distance
4 Wind
5 A. H.
6 Vol.
7 L/D
8 W/L
9 QNH
10 Batt.
11 Temp.
12 A.Climb/
McCready
13 Info
For optimal cursor movement via vario/speed to fly there are two setting points available in Setup.
1. Vario/speed to fly change over C:V-S
2. Speed to fly/vario change over C:S-V
For example if you were to choose the following cursor values
♦C:V-S set to 12 A.Climb/McCready
♦C:S-V set to 4Wind
When change over from vario to speed to fly takes place, the cursor automatically jumps to average
climb/McCready. When the change over from speed to fly to vario takes place the cursor auto-
matically jumps to wind.
8 Acoustics
Volume can be changed by putting the cursor to Vol. V: 100 is the maximum volume and V: 0 is
volume off.
You can alter the frequency of the sound using A: FREQ and the speed of the broken tone using
A:TACT.
For automatic volume, controlled by your flying speed, use A- AVOL. The setting range in A: AVOL is
from 0to 5.
You can change these values; A: FREQ, A: TACT and A: AVOL in Setup.
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C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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9.0 Setup
In Setup you can configure the C4 to your own requirements.
How to enter Setup
♦Put the cursor to Info.and turn the right rotary knob to bring up Setup.
♦Briefly press the OK switch
♦If there is no safety code entered you are now in Setup. If there is a safety code, you have to enter
your code and press the OK switch to enter it.
How to leave Setup
♦When you want to leave the Setup menu press the OK switch briefly
Moving from one Setup-Menupoint to another
♦Turn the left hand rotary knob.
Altering values in Setup
♦Turn the right hand rotary knob.
9.1. Items in Setup
Abbreviation Items Value Units Recommended
setting
CONTR Contrast 0 to 30 none 18
INT:D Average time 1 to 120 seconds 15
VAR:D Vario damping 1 to 6 seconds 3
SF:D Speed to fly damping 1 to 6 seconds 4
NET:D Netto vario damping 1 to 60 seconds 5
LD:D L/D display delay 10 to 300 seconds 120
POLAR Polar 1-4 none
P5:A Polar coefficient a 10 to 9990 none
P5:C Polar coefficient c 100 to 9990 none
COMP Compensation -25 to 125 %
VS:GPS GPS controlled vario/speed
to fly change over 0 1 off active
VS:SW External switch 0
1
-1
0 = off
Closed
Open
VS:VOF Automatic change from vario
to speed to fly (speed con-
trolled)
0 to 200
0 to 120 km/h Kts 110
VS:VON Automatic change from
speed to fly to vario (speed
controlled)
0 to 199
0 to 109 km/h Kts 90
BAT:LO Low battery warning 10 to 16 Volt 11
TEMP Temperature adjustment -30 to + 100
-80 to +170 °Celsius or Fahrenheit
A:FREQ Frequency (pitch) -10 to 10 None -7
A:TACT Broken tone -10 to 10 None 6
A:AVOL Automatic volume adjusted
to speed 0 to 5 None 3
A:SF-N Dead band on speed to fly 0.1 to 4.0
20 to 800 m/s ft/min 1 200
A:VAR.S Dead band for sink in vario
mode 0 1 off active 0
H:G.VAR
Height gained when
switching from speed to fly
to vario
0
1 off active 0
H:AR.WP Pre-set arrival height for
waypoints
0 to 5000m
0 to 15000 ft 0
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C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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Abbreviation Items Values Units Recommended
value
H:METR
H:FEET
Value of displayed units and
change over from metric to
English units
0
1
m, km, m/s,
km/h, hPa
ft, nM, ft/min,
Kts, hPa
0
H:QNH Calibration of altimeter 600 to 1100 hPa -
IAS:N Calibration of air speed indi-
cator - - -
VAR:N Calibration of vario - - -
VAR:R Range of vario movement 5 or10
1000 or 2000 m/s ft/min 10 2000
VAR:S Vario LCD display 0
1 linear non-linear 1
VAR:T Delay in tendency arrows 0.1 to 2.0
20 to 400 m/s ft/min 0.4 80
AN:NUL Vario 0 setting -50 to +50 none 0
AN:MAX Sensitivity of analogue vario 75 to 125 none 100
AN:RUN
AN:VAR
AN:SF
AN:NET
AN:V-N
Possible settings for
analogue instrument 0
1
2
3
4
As pseudo
analogue
display
always vario
always speed
to fly
always netto
vario
vario in vario
mode and netto
vario in speed
to fly mode
0
C:V-S Cursorpoint for speed to fly
setting 0 to 13 none 13
C:S-V Cursorpoint for vario setting 0 to 13 none 4
COD-A Security code A 111 to 999 none
COD-B Security code B 111 to 999 none
9.2 Explanation of Setup features
♦Contrast can be set over a range of 0 to 30. You choose the setting to suit your seating position.
♦The averager can be set on INT:D from 1to 120 seconds.
♦The damping of vario and speed to fly can be varied using VAR-D and SF-D.
♦The netto vario damping can be varied from 1to 60 seconds using NET: D.
♦The calculation of the true L/D uses averages. The time for calculations can be set in 10 second
steps with LD: D.
♦There are four possible basic polar settings (POLAR) in Setup:
Club class (Polar Nr.1), Standard class (Polar Nr.2), Racing class (Polar Nr.3), Open class
(Polar Nr.4). With Polar Nr.5 you can put in a polar to suit your glider.
The precise calibration of your polar uses W/L (wing loading) and L/D (glide angle).
♦With P5: A and P5: C you can input the values you calculated for your own glider (see section
about calculating polars on page 14).
♦COMP shows the electronic compensation value of the C4 in %.
♦If VS: GPS is set to 0 no input from the GPS is taken by the C4. When VS: GPS is on 1, the
change over from vario to speed to fly is done automatically using GPS data.
Note: When vario and speed to fly change over is activated via VS: GPS this automatic change over
has preference. Only when you switch off the GPS connection does the vario/speed to fly change over
via stick or flaps become active.
•If you want the change over from vario to speed to fly to be activated by a flap switch you must put
VS: SW to 1or -1, depending on whether, in vario mode, your switch is open 1or closed -1.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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♦When you want the change over to be linked to the speed of your glider, you can set this in VS:
VOF and VS: VON, but you must also put VS: SW to 0 to make this link active.
♦The battery warning BAT:LO can be set to a voltage you regard as low for the safe operation of the
instrument (10volt minimum)
♦In TEMP you can calibrate the temperature shown with the real temperature of the probe (right ro-
tary knob). Use a good thermometer for reference.
♦To change the frequency of the audio output use A: FREQ and the broken tone A: TACT whereby
you can select the audio output that suits you best.
♦A: TACT controls the speed of the broken tone.The higher the value of TACT, the faster the breaks
in tone occur for an increasing climb rate. A lower or negative value produces a slower break in
tone.
♦With A: AVOL you can regulate the variation of volume with changes in air speed. 0=no change
and 5=maximum change in volume with speed.
♦With A: SF-N you can set a dead band on speed to fly.
♦If you want to hear a signal when you are vario mode and in sink set A: VAR.S to 0.
♦When H:G.VAR is set to 1, the altimeter displays the height diference achieved since the last
change over from speed to fly to vario
♦Input an arrival height for a waypoint at H: AH.WP.
♦Metric units are set in H: METR when 0is chosen (m, km, m/s, km/h, hPa). English units are set in
H:FEET when 1is chosen (ft, Nm, ft/min, °C, Kts, hPa) You can see the set units on the altimeter
display (either m or ft)
♦In H: QNH you can set the correct pressure for the displayed height. The relationship between
pressure and height can vary through changes in the pressure transducer.
♦Indicated Air Speed (IAS) displays the indicated air speed. You can alter the value of the IAS in IAS:
N. On the ground set the value with the last turn of the right rotary knob to 0.
♦Calibrate the 0 point of the vario in VAR: N.
♦In VAR-R you set the full deflection of the vario.
♦If you would like a finer vario display in the 0 area, you can spread this display in VAR: S.
♦The tendency arrows at the average display show if the thermal is improving or deteriorating. In
VAR: T you can change the sensitivity of the arrows.
♦The zero point for an analogue instrument is set in AN: NUL. As soon as you have chosen this
menu point the vario should show 0 (NUL). Should this not happen use the right rotary knob to set
the vario to 0.
♦To adjust the maximum range of the analogue instrument use AN: MAX. As soon as you have
chosen this menu point, the vario should show 5m/s climb. Should this not happen adjust it with the
right rotary knob.
♦With AN:RUN, AN:VAR, AN:SF, AN:NET and AN:V-N you can choose what is going to displayed
on your analogue instrument.
•AN:RUN = analogue instrument same as C4
•AN:VAR = analogue instrument is always vario
•AN:SF = analogue instrument is always speed to fly
•AN:NET = analogue instrument is always netto vario
•AN: V-N = when C4 in vario mode analogue instrument shows vario; when C4 is in speed
to fly mode, analogue instrument shows netto vario
♦C.V-S marks the cursor point which will be displayed by changing from vario to speed to fly mode.
♦C.S-V marks the cursor point which will be displayed by changing from speed to fly to vario mode.
♦The safety code can be changed by using COD-A and COD-B. To prevent undesirable and rapid
changing of the codes the cursor points COD-A and COD-B have to be set to the same number.
The new code becomes effective when the C4 COMPETITION is switched on again. The values of
COD-A and COD-B return automatically to 111 and 999 after the new code has been set.
10.0 The first flight
Before you fly with the C4 for the first time, you have to set the following items.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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10.1 Switching on
After switching on the cursor will go to QNH (airfield height). Input the correct height with QNH to acti-
vate the altimeter. Confirm by pressing OK.
10.2 Inputting your polar in Setup
♦Club class
(Polar Nr.1)
♦Standard class
(Polar Nr.2)
♦Racing
class
(Polar Nr.3)
♦Open class
(Polar Nr.4)
♦
Individual Polar
(Polar Nr.5)
10.2.1 Final adjustment of polar
♦set L/D
♦set W/L
10.3 Compensation
There are two options:
1. electronic compensation
2. compensation with the Brunswick tube
We prefer Brunswick tube compensation.
The criteria for good compensation are;
(a) the choice of the right tube,
(b) the position of the tube on your glider and
(c) air tight connections of your pneumatic tubes.
Should you decide to use electronic compensation, static pressure is important. It might be nec-
cessary to fit an extra static tube. True compensation is an important factor when flying a glider. You
could ask the maufacturer of your glider for advice about this.
10.3.1 Compensation and the C4 COMPETITION
The COMP value shows you in % the electronic compensation of the C4.If there is no leak in the
pneumatic fittings from the Brunswick tube the COMP value should be 0. If no Brunswick tube is used
then the COMP value should be 100 and the TE/STATIC should be connected to Stat. with a V-
connector. Leaks in the pneumatic connections can be compensated over a range from -25 to 125%.
The correct setting of the COMP value has to be carried out in flight:
Proceed as follows:
♦increase the speed of your glider to about 100kts and keep this speed for at least 20 seconds.
Then reduce your speed by slowly pulling back the stick to about 50kts. During this procedure the
vario should show the descent of your glider as per polar.
•if the vario shows climb, the vario is under compensated and the COMP value has to be increased
If the vario shows too much sink, the vario is over compensated and the COMP value has to be
reduced.
10.4 Vario characteristics
The setting of the delay time for the vario and speed to fly depends on the pilot’s preference. There is
a wide choice from very fast (nervous) to very slow (lazy).
The following values have been found useful during many hours of flight and can be input in Setup.
Vario delay: about 2- 3 seconds
Speed to fly delay: about 4 seconds
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10.5 Dirty wing polars
Dirty wings destroy performance! Realistically there may be a decline of 20% due to flies on the wings.
Measurements on a Nimbus 4 have shown a decline in the best glide angle from 60 to about 45. Do
consider dirty wings during a final glide and choose a realistic glide angle.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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10.6 Speed to fly
The Info menu contains the points HH and 2H. HH shows the average speed achieved over the last
half an hour and 2H shows the average speed achieved over the last two hours. If you have chosen
one of these points you can set it to 0by pressing the OK key.
Comparing the two achieved speeds allows you to judge if completion of a set task is possible.
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11.0 Installation
11.1 Mechanical installation
1. Cut out a normal 80mm diameter hole with 4 screw holes. The lower two holes should be bored out
to 6mm diameter.
2. Take out the two Phillips screws from the front.
3. Take the caps off the control knobs and loosen the two screws inside the control knobs with a
screwdriver. You can now remove the control knobs and the two hexagonal nuts using a suitable
spanner.
4. Put the C4 into the panel from the rear and fasten it with the two Phillips screws.
5. Now fasten the two nuts firmly using a spanner. Take care not to over-tighten.
6. Put the control knobs on the shafts and fasten by tightening their retaining screws.
7. Finally, press home the two covering caps.
11.2 Electrical installation
Take care that cables or pipes are not trapped or subject to rubbing. You cannot switch on the in-
strument if it is connected wrongly. You must fit a 4amp fuse in the cable to the battery. The four linked
RJ45 connectors with the labelling 12V, FLAP SWTCH, ANAL.INSTR., TEMP.-PROBE, SPEAKER
are all wired in parallel. This means you can connect the cables to any position.
11.2.1 Description of electrical connections
Connections for 12V, FLAP SWITCH, ANALOGUE INSTRUMENT, TEMP.- PROBE, SPEAKER
•12 V; battery connection: Attach the red lead with the (+) terminal and the black lead with
the (-) terminal of the battery. Put a 4amp fuse into the red lead for safety.
•TEMP.-PROBE; temperature probe with heat shrink on the end.

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•FLAP SWITCH; flap cable connection. The white and brown leads should be attached to
the flap or stick switch.
•ANAL.INSTR.; you can connect an analogue readout here
•SPEAKER; connection for loudspeaker
Connection for GPS/NMEA INPUT
•The connector for the NMEA interface complies with IGC standards. You can connect any
data logger with an RJ11 or RJ45 connector directly.
Connection for PC/SEC. READ OUT
•PC; is used to input new software.
•SEC. READ OUT; connection for second read out for two seater
Connection for CONTROL STICK
•Option only
11.2.2 Wiring with coloured cables (RJ45)
Connections for 12V, FLAP SWITCH, ANAL.-INSTR., TEMP.-PROBE, SPEAKER
•Pin 1, orange/white -> Plus lead for analogue vario
•Pin 2, orange -> Earth
•Pin 3, green /white -> Signal 1 loudspeaker; SPEAKER
•Pin 4, blue -> external switch vario/speed to fly change over; FLAP SWITCH
•Pin 5, blue/white -> Signal from temperature sensor; TEMP.-PROBE
•Pin 6, green -> Earth
•Pin 7, brown/white -> 12 volt
•Pin 8, brown -> Signal 2 loudspeaker; SPEAKER
Connections for GPS/NMEA INPUT
•Pin 1, orange/white -> free
•Pin 2, orange -> Earth
•Pin 3, green /white -> RXPC
•Pin 4, blue -> TXPC, NMEA INPUT
•Pin 5, blue/white -> isolate when lead is open
•Pin 6, green -> isolate when lead is open
•Pin 7, brown/white -> 12 volt
•Pin 8, brown -> free
Connections for PC/SEC. READ OUT
•Pin 1, orange/white -> Urlader < signal for Software update
•Pin 2, orange -> Earth
•Pin 3, green /white -> isolate when lead is open
•Pin 4, blue -> isolate when lead is open
•Pin 5, blue/white -> RX second readout for two seaters
•Pin 6, grün -> TX second readout for two seaters
•Pin 7, brown/white -> isolate when lead is open
•Pin 8, brown -> 5 volt
11.3 C4 – GPS interface
To operate the C4 COMPETITION with a GPS interface the NMEA output has to be activated as be-
low.
♦Data out = NMEA 0183; Data in = OFF (NONE)
Various GPS systems allow the transfer of several data sentences. The following sentences should be
transferred.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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♦GPRMB, GPRMC, GPROO, GPWPL,
Testing the C4 COMPETITION – GPS interface
♦Connect the C4 COMPETITION to the GPS as described.
♦Switch on the C4 and the GPS.
♦As soon as the GPS has acquired sufficient satellites to determine your position, move the C4 cur-
sor to NAV and NO:GPS should disappear from the screen. Should NO:GPS remain, test the elec-
trical connections and make sure your GPS sends the NMEA183 signal (you have to call this func-
tion up in the setup menu of the GPS>)
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11.4. Pneumatic fitting
For connection use a pipe with a 4-5mm diameter. Do not use a pitot that is connected with a basic
instrument (German law).
♦TE/STATIC takes Brunswick tube and you
must set the COMP value in Setup to 0.
♦If you do not use a Brunswick tube the
TE/STATIC connection takes static pressure.
♦If you do not use a Brunswick tube you must
alter the value of COMP in Setup to 100.
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12.0 Technical Data
Dimensions Flight computer 160x82x82mm
Cut out 80mm circle
Weight About 600 g
Current usage About 80 mA
Supply 10-16 volts
Temperature range -25°C to +50°C
Altimeter -999 to 9999m
Vario range +/- 10 m/s (+/- 20kts)
Outside temperature
range -30°C to +100°C
Standardisation ICAO Standard atmosphere
GPS Interface NMEA 183
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13.0 Guarantee
The terms for delivery, products and services of the German electronic industry apply. Guarantee is
for one year. Proof of guarantee is your bill of sale; please keep it in a safe place. In order to make
use of the guarantee, you must follow the rules for use set out in the handbook and follow the correct
installation procedure.
We will take no responsibility for secondary costs which could arise from the failure of our in-
struments. We draw your attention to the fact that our instruments do not replace BASIC
INSTRUMENTATION.

C4 COMPETITION Handbook SDI Franz Pöschl GmbH
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14.0 Development and sales (Germany)
SDI Franz Pöschl GmbH
Mühlwinkl 4
D-83224 Staudach
Telephone
Telefax
Mobile
e-mail
Homepage
08641/5277
08641/5276
0171/5446757
[email protected]
www.sdi-variometer.de
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Sales in the UK
Ernst Specht
9 Ennerdale Crescent
Nuneaton CV11 6HY
Tel: [phone]
Or
Frank Stevens
38 Endhill Road
Birmingham B44 9RR
Tel: [phone]