TEK Probe and pressure connection
Moderator: rainer
TEK Probe and pressure connection
Here some experiences when equipping openxsensor/-vario with a TEK-Probe:
Pressure connection first try: Result: the tube broke out when loaded Better versions with supported connections, second one with silicon: The tested probes: The absolutely best "Braunschweiger Duese": The idea and the plan is from here: Thanks Tempo
The used material: 4mm gold socket, 2mm and 4 brass tube, 9mm washer, solder Instructions: Drill a 2mm hole for the 2mm brasstube, make a chamfer in the 4mm brass tube and solder it inside the socket, the chamfer ending exactly at the 2mm hole, solder the 2mm brass in the hole, remove eventally overcoming brass and solder inside the socket carefully with a 4mm drill (by hand, not machine!). Remove the overcoming chamfered brass at the inlet, smooth the inlet inside and outside (round it). Rasp the hole inside the washer to fit the outside of the socket and solder it. shorten the overcoming socket at the outlet. Rasp the outlet at the washer and sand it.
Important: check always if everything is airtight.
Mounting example: And here is the result, an overcompensated TEK. You can adjust it down for exact compensation by reducing the outlet with some tape (easy), or reducing the outside diameter of the washer (not so easy).
First testflight with rain and vario sound
Cheers Carbo
Pressure connection first try: Result: the tube broke out when loaded Better versions with supported connections, second one with silicon: The tested probes: The absolutely best "Braunschweiger Duese": The idea and the plan is from here: Thanks Tempo
The used material: 4mm gold socket, 2mm and 4 brass tube, 9mm washer, solder Instructions: Drill a 2mm hole for the 2mm brasstube, make a chamfer in the 4mm brass tube and solder it inside the socket, the chamfer ending exactly at the 2mm hole, solder the 2mm brass in the hole, remove eventally overcoming brass and solder inside the socket carefully with a 4mm drill (by hand, not machine!). Remove the overcoming chamfered brass at the inlet, smooth the inlet inside and outside (round it). Rasp the hole inside the washer to fit the outside of the socket and solder it. shorten the overcoming socket at the outlet. Rasp the outlet at the washer and sand it.
Important: check always if everything is airtight.
Mounting example: And here is the result, an overcompensated TEK. You can adjust it down for exact compensation by reducing the outlet with some tape (easy), or reducing the outside diameter of the washer (not so easy).
First testflight with rain and vario sound
Cheers Carbo
Re: TEK Probe and pressure connection
Another picture from the outlet to the inside, you see the chamfer:
Re: TEK Probe and pressure connection
@Carbo
Good idea to use gold socket and washer for "Braunschweiger Düse"
Your new horizontal tube connection on MS5611 allows a new feature:
Mount openxsensor inside vertical tail and you receive short tube connection to TEK-pipe at top end of vertical tail.
That´s best position for pipes outside of fuselage and wing flowfield.
Give it a try
Good idea to use gold socket and washer for "Braunschweiger Düse"
Your new horizontal tube connection on MS5611 allows a new feature:
Mount openxsensor inside vertical tail and you receive short tube connection to TEK-pipe at top end of vertical tail.
That´s best position for pipes outside of fuselage and wing flowfield.
Give it a try
What you had to know about TEK-compensation
This is a good source for understanding how pipes work and how to trim pipes:
Full compensated TEK probe
After trying different diameters for the washer at the outlet, 6.1mm seems to be the optimum.
Short Video Loop and waves
The chamfer should be outside on the inlet, not inside. It did not change the effect, but on the original plan it is this way and its easier to produce.
Plan (thanks to my son) :
Cheers
Short Video Loop and waves
The chamfer should be outside on the inlet, not inside. It did not change the effect, but on the original plan it is this way and its easier to produce.
Plan (thanks to my son) :
Cheers
Last edited by Carbo on Wed Jul 16, 2014 9:06 am, edited 1 time in total.
Re: TEK Probe and pressure connection
Your video shows mounted filament. It´s a good idea. This way you analyse influence of yaw angle to TEK-probe.Carbo wrote:...
And here is the result, an overcompensated TEK. You can adjust it down for exact compensation by reducing the outlet with some tape (easy), or reducing the outside diameter of the washer (not so easy).
First testflight with rain and vario sound
Cheers Carbo
I prefer filament mounted in the middle of brass tube. ( Not assymetrical of fuselage ! )
Yes, you use a V-tail glider with airscrew. In that case you positioned TEK-probe close to airscrew as possible. Try it with a little bit longer brass tube. Beware of fuselage and wing flow field especially in case of high angle of attack respectively in case of low speed in thermals.
Re: TEK Probe and pressure connection
The length is limited by the length of the used socket - but it works. Today it was really complicated, to find a piece of calm air, i flew through all kind of thermals and downwinds. The vario tones were never inappropriate, so there is a good chance, the botched job does what its supposed to doTempo wrote: Yes, you use a V-tail glider with airscrew. In that case you positioned TEK-probe close to airscrew as possible. Try it with a little bit longer brass tube. Beware of fuselage and wing flow field especially in case of high angle of attack respectively in case of low speed in thermals.
Cheers Carbo
Ready for thermal hunting ?
Total Energy Kompensation = you will only detect rising air or falling air. Learn more about and read
Firstly built housing for sensor MS5611 :
Seal with slowly setting epoxy. Compound epoxy with elastic filler like sanding dust of balsawood or use "UHU endfest 300".
Cover with very light glass fiber fabric .
Secondly make leak proof:
Fix syringe and control about 5 to 10 minutes display of altitude. I produced airpressure for example of 5361 meters.
Useful display for Taranis is LUA Telemetry Screen #2 http://www.open-tx.org/2014/06/30/telem2-lua/ .
Thirdly build TEK probe:
viewtopic.php?f=48&t=5632&start=30#p82456
Locate TEK probe outside of air flow of fuselage or wing !!
Connect sensor of variometer only with short tubes or hard tubes for longer distances.
Cover with very light glass fiber fabric .
Secondly make leak proof:
Fix syringe and control about 5 to 10 minutes display of altitude. I produced airpressure for example of 5361 meters.
Useful display for Taranis is LUA Telemetry Screen #2 http://www.open-tx.org/2014/06/30/telem2-lua/ .
Thirdly build TEK probe:
viewtopic.php?f=48&t=5632&start=30#p82456
Locate TEK probe outside of air flow of fuselage or wing !!
Connect sensor of variometer only with short tubes or hard tubes for longer distances.
Protect MS5611 of light
Sensor MS5611 is sensitiv to light. Protect for example with black shrink tube.
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I have just been sent this link. I will read and study it, thanks.