Electronic TE compensation, will this work?

Thanks Kevin! Do you still have the bad/leaking TE line plugged into the S100 or do you just have it open to the cockpit?

No don't use anything on the TE port if it is bad

Kevin 92

In my Stemme I have the ClearNav vario electronically compensated, I
think it's set around 90%, and it uses the fuselage static ports, aft of
the wing, and the pitot tube on the nose.Â* The mechanical variometer
uses the TE probe, also in the nose boom.Â* They both track nicely together.

On 2/12/2020 4:28 AM, wrote:
I have the same situation with a bad TE line. Not using the TE line, just the static and the pitot on the S-100. They are the standard static and pitot on a DG400, Not in a multi probe.

With the S-100 you can tune the compensation from 0 to 100. Usually 0 for perfect TE set up and 100 for perfect static/ pitot system. You have to adjust it and play with it some, but can get a great result. I am set at about 80.

Kevin
92

--
Dan, 5J

On Wednesday, February 12, 2020 at 8:37:42 AM UTC-8, Dan Marotta wrote:
In my Stemme I have the ClearNav vario electronically compensated, I
think it's set around 90%, and it uses the fuselage static ports, aft of
the wing, and the pitot tube on the nose.Â* The mechanical variometer
uses the TE probe, also in the nose boom.Â* They both track nicely together.

On 2/12/2020 4:28 AM, wrote:
I have the same situation with a bad TE line. Not using the TE line, just the static and the pitot on the S-100. They are the standard static and pitot on a DG400, Not in a multi probe.

With the S-100 you can tune the compensation from 0 to 100. Usually 0 for perfect TE set up and 100 for perfect static/ pitot system. You have to adjust it and play with it some, but can get a great result. I am set at about 80.

Kevin
92

--
Dan, 5J

Interesting. In the S100 manual it is saying that for the electronic TE to be effective the pitot and static should be colocated (ideally in multiprobe). Interesting that you are getting good electronic TE with the sources that far apart. I guess its worth a try for me. I can try using the statics in the tail boom and see what happens.

** Caution **Â* I'm not competing in world contests, just flying for
fun.Â* That said, it seems to work OK for me.Â* And it's certainly good
enough for Diamond flights.

And how do you know that your TE line is leaking?Â* Have you pressure
checked it?

On 2/12/2020 10:15 AM, soaringjac wrote:
On Wednesday, February 12, 2020 at 8:37:42 AM UTC-8, Dan Marotta wrote:
In my Stemme I have the ClearNav vario electronically compensated, I
think it's set around 90%, and it uses the fuselage static ports, aft of
the wing, and the pitot tube on the nose.Â* The mechanical variometer
uses the TE probe, also in the nose boom.Â* They both track nicely together.

On 2/12/2020 4:28 AM, wrote:
I have the same situation with a bad TE line. Not using the TE line, just the static and the pitot on the S-100. They are the standard static and pitot on a DG400, Not in a multi probe.

With the S-100 you can tune the compensation from 0 to 100. Usually 0 for perfect TE set up and 100 for perfect static/ pitot system. You have to adjust it and play with it some, but can get a great result. I am set at about 80.

Kevin
92
--
Dan, 5J
Interesting. In the S100 manual it is saying that for the electronic TE to be effective the pitot and static should be colocated (ideally in multiprobe). Interesting that you are getting good electronic TE with the sources that far apart. I guess its worth a try for me. I can try using the statics in the tail boom and see what happens.

--
Dan, 5J

On Wednesday, February 12, 2020 at 10:21:23 AM UTC-8, Dan Marotta wrote:
** Caution **Â* I'm not competing in world contests, just flying for
fun.Â* That said, it seems to work OK for me.Â* And it's certainly good
enough for Diamond flights.

And how do you know that your TE line is leaking?Â* Have you pressure
checked it?

On 2/12/2020 10:15 AM, soaringjac wrote:
On Wednesday, February 12, 2020 at 8:37:42 AM UTC-8, Dan Marotta wrote:
In my Stemme I have the ClearNav vario electronically compensated, I
think it's set around 90%, and it uses the fuselage static ports, aft of
the wing, and the pitot tube on the nose.Â* The mechanical variometer
uses the TE probe, also in the nose boom.Â* They both track nicely together.

On 2/12/2020 4:28 AM, wrote:
I have the same situation with a bad TE line. Not using the TE line, just the static and the pitot on the S-100. They are the standard static and pitot on a DG400, Not in a multi probe.

With the S-100 you can tune the compensation from 0 to 100. Usually 0 for perfect TE set up and 100 for perfect static/ pitot system. You have to adjust it and play with it some, but can get a great result. I am set at about 80.

Kevin
92
--
Dan, 5J
Interesting. In the S100 manual it is saying that for the electronic TE to be effective the pitot and static should be colocated (ideally in multiprobe). Interesting that you are getting good electronic TE with the sources that far apart. I guess its worth a try for me. I can try using the statics in the tail boom and see what happens.

--
Dan, 5J

Me too. Im just flying for fun locally, have not even done any cross country yet. I am just looking for SOME TE compensation vs the NONE I have right now. Im going to just give it a try and see what happens. Its worth a try at least.

On Wednesday, February 12, 2020 at 1:33:44 AM UTC-5, soaringjac wrote:
I am working through and investigating a leaking TE line in my ship. Leak tested the TE line and it seem to be wide open. Still have some more testing to do but as of now my feeling is the leak is in the fin and completely inaccessible. I think its leaking at the back of the TE port in the fin.

I have an LXNav S100 installed and I am curious if the electronic TE compensation on it might help or work for me. If the leak is at the back of the TE port in the fin then it is basically acting as a static port pulling pressure from the inside of the fin. I read that for electronic TE to work right the static and pitot should be co-located (multiprobe). If the TE line is indeed leaking at the back of the TE port, which is right below the pitot port, then this would be pretty close to a multiprobe setup since the sources are so close and both on the fin.

So, any idea if this will work for me to get at least a somewhat compensated vario?

The plumbing in the ship now for TE line is:
TE line from fin and split under seat pan. One line going to the S100 and the other to a Winter mechanical vario (with flask)

All you need to do to try electronic TE is identify the static used for your airspeed indicator. If properly plumbed it will be to the source identified by the manufacturer as the best source they have. The flight manual likely has the error chart for this source.
Connect this static source to your vario, reconfigure as needed , and go fly. If you are satisfied, you are good to go on that vario.
Repairing the TE system is another issue and would be needed to get the mechanical vario working right.
I would bet that your issue is likely either a missing or damaged o-ring if you are using a multi probe, or something funky further forward. I would isolate it at the tee under the seat and check back. Note that you can not do any valid leak checking with bad seal in the socket.
For leak checking I use a small pressure gage reading in inches of water. 5 inches is equal to about 100 mph. You can also rig a water manometer made of instrument tubing to do the same thing.
Good luck
UH

On Wednesday, February 12, 2020 at 1:33:44 AM UTC-5, soaringjac wrote:
I am working through and investigating a leaking TE line in my ship. Leak tested the TE line and it seem to be wide open. Still have some more testing to do but as of now my feeling is the leak is in the fin and completely inaccessible. I think its leaking at the back of the TE port in the fin.

I have an LXNav S100 installed and I am curious if the electronic TE compensation on it might help or work for me. If the leak is at the back of the TE port in the fin then it is basically acting as a static port pulling pressure from the inside of the fin. I read that for electronic TE to work right the static and pitot should be co-located (multiprobe). If the TE line is indeed leaking at the back of the TE port, which is right below the pitot port, then this would be pretty close to a multiprobe setup since the sources are so close and both on the fin.

So, any idea if this will work for me to get at least a somewhat compensated vario?

The plumbing in the ship now for TE line is:
TE line from fin and split under seat pan. One line going to the S100 and the other to a Winter mechanical vario (with flask)

Take the rudder off; there may be an access hole in the spar.
JMF