Effective December 5, 2005, Steve Kroop at Flytec USA will provide service and support to owners of Brauniger instruments.
I have purchased an IQ series instrument recently, and the barometric pressure does not really change if I check it every now and then when I turn it on inside my house. The altitudes of A1 and A2 change but not the hPa reading. Why?
Do the following:
- Adjust the A1 to the altitude above sea level you are, for instance 200 m MSL
- Go to SET-Mode and check the air pressure, it might read something like 1012 hPa.
- A day or two later switch on the instrument again at the same place. You will notice the A1 will probably show a different altitude, say 230 m. The vario by itself cannot know if you lifted it 30 m upstairs, or if the air pressure has changed because of weather conditions.
- Now adjust the A1 back to the actual altitude MSL you are at, in our example 200m
- Now check the air pressure and you will see that it shows the new value, perhaps 1015 hPa.
You only need to set A1 to the actual altitude (MSL) you are at in order to get the correct corresponding QNH (air pressure). We suggest you ask your flight instructor how barometric pressure and altitude reading correlate, or read a good book on the subject.
The altitude is adjusted by pressing the arrow keys in such a way that the arrow key is pressed repeatedly within a short period of time to adjust single meter increments. (You could hold down on the arrow key to make the meters quickly count up or down, in this case the problem cannot occur)
If you press the keys repeatedly within a short period of time it can happen that suddenly the altitude jumps to a strange value (e.g. 12000 meters). If you press again the altitude jumps back to the correct value. No problem, but the strange value is stored.
What can you do to correct this problem:
At the moment there are two ways of getting around this behaviour:
- If the strange value has shown, just switch off the instrument and switch it back on – the incorrect value will NOT be stored.
- Do not press the arrow keys repeatedly within a short period of time but rather press the arrow keys for a longer period of time to start scrolling.
It seems this behavior only shows in very rare instances.
Example: Waypoint ABC at 1230 m, the waypoint designator could be ABC123 (where ABC are any letters and 123 represents the altitude in meters without the last digit)
In an eMap this would look like this ABC123_ _ _ _ (the last 4 digits MUST be left blank!)
- McCreadySome pilots prefer to keep the normal climb/sink tone instead of the special McCready tone when the McCready function is activated. Pressing the lower centre key switches between McCready acoustics and standard acoustics.
- MEMO-ModeAn additional statistical function has been added. The new altitude >A3< adds up the total of all climbed meters during a flight. If some pilots fly the same distance, the pilot which had to climb the fewest meters for a given distance is most effective.
- Display of GPS co-ordinates (IQ Competition/GPS only)If a flight is done with a GPS receiver connected and the barograph activated, and the >Marker< key is pressed, not only a chevron will be displayed on the barogram but also the geographical GPS co-ordinates of the location where the >Marker< key was pressed. A maximum of 15 co-ordinates can be stored per flight. If the barogram is printed directly to a printer, the co-ordinates are printed after the barogram graph.
From April 2000:
- IQ Competition/GPS are now compatible with GARMIN GPS eMap and eTrex
- Faster data transfer from GPS 12 to IQ Competition/GPS (IQ Competition/GPS only)
- The data transfer rate from GPS to IQ Competition/GPS can now be set to 9600 baud. The advantage is a faster transfer of the MNEA data sentence which enables the IQ Competition/GPS to calculate the wind influence in shorter time intervals (1 x sec)
- The correct setting in the interface menu of the Garmin GPS is now:NMEA 0183 Version 2.0 9600 baud
- Stall Alarm Suppression (especially suitable for hang gliding)A special altitude above MSL can now be set in the new SET-Mode 26. Below this altitude the stall alarm is active. If you fly above this altitude, the stall alarm is inactive. Background of this function is that some pilots don’t want the stall alarm when they are circling slowly in thermals. But for landing they would like the stall alarm active. This can now be achieved with the new function. The altitude in SET-Mode 26 must of course be adjusted to the altitude of your landing site. Example: LZ at 200 m MSL versus LZ at 2000 m MSL. If you want the stall alarm to be active all the time, set the altitude in SET-Mode 26 to e.g. 6000 m.
From June 2000:
- A bug with the eMap has been eliminated
When no GPS is connected:
- Top bar: L/D through the air, simply calculated by speed over sink. Not terribly informative as value will change all the time with changing sink (ups and downs)
Bottom Bar: battery power status
- GPS connected with valid data from GPS and McCready activated:Top Bar: Flyable L/D over ground which takes into consideration wind influence and is calculated from polar, air speed and wind and assumes that the air mass is neither climbing nor sinking.
Bottom bar: battery power status
- GPS connected, McCready activated and GoTo function on GPS activated (final glide calculator):
Top Bar: Flyable L/D over ground which takes into consideration wind influence and is calculated from polar, air speed and wind (but not the Vario readings).
Bottom bar: Necessary L/D to waypoint which is calculated distance to waypoint over altitude difference.
The waypoints in metric IQ Systems are coded
ABC145 = Waypoint is 1450 m altitude MSL
In US IQ Systems waypoints are coded:
ABC145 = waypoint is 14500 ft altitude MSL
ABC014 = waypoint is 1400 ft altitude MSL
Otherwise we wouldn’t be able to code altitudes above 9999 ft
The altitude above target (the 3 digits next to the target symbol) is in ft x10
From April 2000:
Compatibility with Garmin eTrex and eMap
My Brauniger IQ CompGPS Vario always shows the wrong date and time. Every time I adjust the date and time and switch the vario back on it is the wrong date and time again, e.g. 1995.
Problem with the PC-Graph software: The program starts normally. I connect the cable to the instrument and COM 2 on the computer. I want to transfer flight data - the window with the message switch to memo-mode comes up and I press the MEMO key for 3-4 seconds. But nothing happens - no transfer!
- Can you transfer the flight log with “data transfer > directory”?
- “Data transfer > flight data” transfers the flight data (barogram) of one single flight, i.e. the flight you have selcted in memo mode. “Data transfer > directory” transfers only the flight log data of all flights but no barograms.
- Was the barograph really switched on during the flight? Have you really recorded barograph values?
- Check if COM 2 works on your computer. Is the port really activated? Have you really plugged the cable into COM 2?
Now you must distinguish between two phases :
Phase 1- While circling up in a thermal before starting the final glide.
There is an averager vario inside the instrument with a fixed time constant of 30 sec, measuring your average climb rate in the thermal. There is a table, based on your polar, with nominal speeds for all possible climb rates (Tangent calculation). Also, for every speed there is a specific L/D ratio. Next step: Whenever the nose of your glider is pointing towards goal ( + / – 20 degrees) the instrument measures the difference between airspeed and groundspeed to get the wind-influence. Now the instrument can calculate L/D ratio over ground towards goal at the required McCready speed. Because the variometer knows it’s altitude and the GPS is sending the distance to goal information and the altitude of the goal we are able to calculate the arrival height over or below goal. So when the height over goal says “zero” and you start your glide at a speed which keeps the height over goal at zero, you can be sure to arrive in the shortest possible time.
Phase 2 – During the final glide towards goal.
Assume a pilot had an average climb rate of 2 m/s in the last thermal and left the thermal when the target symbol appeared. If the pilot now would fly with the speed of the best L/D ratio, he would arrive much too high over the goal (he could have left the thermal that much lower); he actually should fly at the McCready speed, which keeps arrival height over goal at zero. Changes in vertical movement of the airmass along the way are also cancelled out by flying a bit faster or slower as the instrument indicates.
The instrument constantly checks for changes of windspeed and constantly calculates your arrival height, based on your polar, your speed, the actual wind influence and last but not least your altitude.
The theory says: if you fly with a McCready ring setting of 2 m, you should continue flying straight even if you are climbing at 1 m/s. The moment you glider starts climbing, the acoustic automatically changes from the McCready sound to the usual climbing sound. When your climb rate exceeds 2 m/s you can start to circle. Now suppose that you fall out of the thermal and try to find the lift again; during this period it would be annoying if the McCready sound started immediately again. For this reason there is an adjustable time window 1 …. 30 sec (Setmode No.13) between end of climbing and the automatic start of the McCready sound.
If you fly at high altitudes in thinner air the True Airspeed (TAS) must be higher than in denser air to get the same best glide ratio. GPS on the other hand always displays the correct groundspeed.
-- 'Can I just fly with the same speed for best glide at all altitudes?'
-- 'No, but if at higher altitudes you hold your control bar in the same position as at best glide in dense air (lower altitudes) you will get the same best glide despite your increased speed and sink rate.'
When using a propeller-driven sender, like the IQ series varios, the unit always displays True Airspeed (TAS). In this case there is no difference between groundspeed and TAS when there is no wind, no matter how high you fly. For final glide calculations we have to use TAS. TAS has one disadvantage, though: The displayed stall speed changes with altitude. The vario shows true rates of sink or climb, they are compenstated according to ICAO standard atmosphere.
We have tested our instruments with the following GARMIN GPS units:
GPS 38, 45, 48, 12, 12XL, 12CX, 90, 92, II, IIplus, III, IIIPilot
Garmin eMap and eTrex units made after October 2000 may also be used.
Magellan Type 315 works, and also the MLR SP24 XC .
- The IQ series instruments can “talk” in two printer languages: Hewlett-Packard and Epson. Both “languages” can be used with printers of many different manufacturers, not only HP and Epson. Check the manual of your printer for the correct language and set it in SET-Mode 14 of your IQ.
HP=PCL 4 or PCL 5
Epson = ESC/P2
- The sequencer of connecting the printer and vario can make a difference: First switch on printer and IQ instrument. Then connect cable to printer and last connect to IQ.
- Check your hardware, is the printer cable OK? Check with the cable of your friend. Also check with another printer.
- Are you sure the flight you want to print out really has barogram data stored? Try printing the flight log instead.
- Please check all cables for tight fit in the ports and also if they are plugged into the correct ports.
A question about my IQ instrument: when I set it to feet (English units) the digital climb/sink meter reads for example 3.5. Does this indicate 350 feet/minute? Or does it mean 3.5 meters/sec. (that is 700 feet/min.)? What about the analog meter? Does that continue to indicate meters/sec. even in the English unit mode?
The analogue vario stays the same in both meter and feet modes. Because 1 m/s climb equals 200 ft/min, only the numbers on the analogue vario scale are different. If you have a metric version, you just have to multiply the numbers on the scale by 200. If you have a US version, multiply the numbers by 100.
The digital vario is switched from m/s to ft/min when you change from meters to feet. The number must be multiplied by 100 in both versions.
1st Reason: To avoid problems with the manufacturers
2nd Reason: The polar depends also on pilots weight, type of harness, flying experience, etc.
To get best help from your IQ-Competition you should determine your own polar yourself:
a) Adjust your flywheel sensor (setmode 19) with help of a GPS receiver. Fly on a calm day with a speed of about 50 km/h (30 MPH) and compare the readings of airspeed and groundspeed. Repeat same test while heading in various other compass directions.
b) Determine the airspeed and value of minimum sink for your glider. The result should be about 40 km/h (24 MPH) and 1 m/s (200 FPM)
c) Determine the second polar point at a higher speed (appx. 75 km/h [46 MPH]) but not the max speed of your glider; the sink rate here should be about 3m/s (600 FPM) or better.
Before using Nominal-speed or McCready functions as well the final glide calculations, try to understand the theory behind their use. Read our manual carefully, study literature relative to the matter or talk with experienced pilots.
For myself I fly with a TEC of 70%, an analog vario time constant of 1.6 sec, and instead of the digital vario in setmode 9 I like to see the digital L/D ratio.
I have re-installed the PC-Graph software and want to use the database of the earlier installation. If I just copy the old database in the directory of the new installation and overwrite the new database, I get an error message like Duplicate value in index.
- Look for the file vario.ini in your windows directory.
- Open it with a text editor, e.g. Notepad. Go to the section [Logbuch].
- There you will find an entry Nummer=10011 (the last 3 digits can be different)
- Change the entry to Nummer=12000 and save the vario.ini file.
- After restarting PC-Graph you will now be able to use the old database.
I am trying to download a barogram from my vario to the PC and I get an error message Invalid file format? What gives?
a) when the altitude A1 is set to zero at take-off. A1 is the altitude above sea-level and should never be set to zero (this is what A2 is for).
b) When you are flying very close to sea-level (e.g. dune soaring) and a rise in air pressure shifts the altitude to “negative” values.
The PC-Graph software cannot handle negative altitude values, but they are downloaded correctly. You’ll find the flight as a *.cmp file in the PC-Graph directory. Open it with a text editor (e.g. notepad) and delete the negative value(s). Save it and IMPORT it to PC-Graph – bingo, there you go!