Motorgliders and TE Probes

Hi,

I received a few very nice e-mails from reputable sources recommending the
use of a pneumatic switch to switch between TE and Static input for a
motorglider. That is good information. This newsgroup is fantastic!

It was suggested that the switch could be made to be automatic. That sounds
great. It is my understanding that even very small leaks can cause large
inaccuracies in TE functionality - so we must be careful about that of
course. Does anyone have any recommendations for manual or automatic
pneumatic switches? It would be great to get feedback from someone who has
done this already.

Thank you,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

"Paul Remde" wrote in message
news:NwKod.141170$R05.69144@attbi_s53...
Hi,

I have a question for motorglider owners. I sell variometers and TE
probes
but I'm still learning. A customer is building a Europa motorglider and
he
is wondering if he can mount a TE probe on the fin and connect it to the
variometer, or will the propwash cause problems. Is it necessary to use
some sort of pneumatic switch to switch between TE and static input for
the
variometer?

His pitot and static ports are on a boom that is mounted to the wing.

Thank you,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

Paul:

I got a nice manual pneumatic switch for use in my oxygen system from
Mountain High a few years ago. You might check with them.

Ray Warshaw

"Paul Remde" wrote in message
news:f%Lod.141383$R05.121337@attbi_s53...
Hi,

I received a few very nice e-mails from reputable sources recommending the
use of a pneumatic switch to switch between TE and Static input for a
motorglider. That is good information. This newsgroup is fantastic!

It was suggested that the switch could be made to be automatic. That
sounds
great. It is my understanding that even very small leaks can cause large
inaccuracies in TE functionality - so we must be careful about that of
course. Does anyone have any recommendations for manual or automatic
pneumatic switches? It would be great to get feedback from someone who
has
done this already.

Thank you,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

"Paul Remde" wrote in message
news:NwKod.141170$R05.69144@attbi_s53...
Hi,

I have a question for motorglider owners. I sell variometers and TE
probes
but I'm still learning. A customer is building a Europa motorglider and
he
is wondering if he can mount a TE probe on the fin and connect it to the
variometer, or will the propwash cause problems. Is it necessary to use
some sort of pneumatic switch to switch between TE and static input for
the
variometer?

His pitot and static ports are on a boom that is mounted to the wing.

Thank you,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

Clippard Industries in Cincinnati Ohio makes several types of Pneumatic
switches.....
these were commonly used years ago back when sailplane pilots used to have
to make their own and a few variometer manufacturers like Richard Ball made
alternative Pneumatic inputs for Netto's and Speed to Fly variometers from
normal TE variometers
tim

"Paul Remde" wrote in message
news:f%Lod.141383$R05.121337@attbi_s53...
Hi,

I received a few very nice e-mails from reputable sources recommending the
use of a pneumatic switch to switch between TE and Static input for a
motorglider. That is good information. This newsgroup is fantastic!

It was suggested that the switch could be made to be automatic. That
sounds
great. It is my understanding that even very small leaks can cause large
inaccuracies in TE functionality - so we must be careful about that of
course. Does anyone have any recommendations for manual or automatic
pneumatic switches? It would be great to get feedback from someone who
has
done this already.

Thank you,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

"Paul Remde" wrote in message
news:NwKod.141170$R05.69144@attbi_s53...
Hi,

I have a question for motorglider owners. I sell variometers and TE
probes
but I'm still learning. A customer is building a Europa motorglider and
he
is wondering if he can mount a TE probe on the fin and connect it to the
variometer, or will the propwash cause problems. Is it necessary to use
some sort of pneumatic switch to switch between TE and static input for
the
variometer?

His pitot and static ports are on a boom that is mounted to the wing.

Thank you,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

On Tue, 23 Nov 2004 14:49:21 -0800, Tim Mara wrote:

Clippard Industries in Cincinnati Ohio makes several types of Pneumatic
switches.....
these were commonly used years ago back when sailplane pilots used to have
to make their own and a few variometer manufacturers like Richard Ball made
alternative Pneumatic inputs for Netto's and Speed to Fly variometers from
normal TE variometers
tim

"Paul Remde" wrote in message
news:f%Lod.141383$R05.121337@attbi_s53...
Hi,

I received a few very nice e-mails from reputable sources recommending the
use of a pneumatic switch to switch between TE and Static input for a
motorglider. That is good information. This newsgroup is fantastic!

It was suggested that the switch could be made to be automatic. That
sounds
great. It is my understanding that even very small leaks can cause large
inaccuracies in TE functionality - so we must be careful about that of
course. Does anyone have any recommendations for manual or automatic
pneumatic switches? It would be great to get feedback from someone who
has
done this already.

Thank you,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

"Paul Remde" wrote in message
news:NwKod.141170$R05.69144@attbi_s53...
Hi,

I have a question for motorglider owners. I sell variometers and TE
probes
but I'm still learning. A customer is building a Europa motorglider and
he
is wondering if he can mount a TE probe on the fin and connect it to the
variometer, or will the propwash cause problems. Is it necessary to use
some sort of pneumatic switch to switch between TE and static input for
the
variometer?

His pitot and static ports are on a boom that is mounted to the wing.

Thank you,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com





I mounted a vertical TE Probe on the top of the fin on our SF25C FALKE
motorglider, connected to a dedicated vario (Borgelt B40). The
aircraft already had a Winter vario connected directly to the static
ports which acts more like a VSI.
The TE probe seems to work very well. The sensing holes near the tip
of the probe would be (from memory) about 10 inces above the top of
the fin.
Regarding switches to change from static to TE, many GA aircraft use
such switches to give an alternative static source for the instruments
in case the primary static ports become blocked. Maybe one of the
aircraft supply houses would have them.
Cheers, John G.

I use a Clippard MJTV-5 pneumatic valve to switch out the TE probe on
my Ventus cT. This is a 5 port, 4 way valve. My notes from the install
indicate you connect the input to port 1, and the ouput is toggled
between ports 2 and 4, depending on the lever position. The exhaust
ports vent the non-operational port to ambient (or whatever you
connect to these ports). Cost is approx. $15 US.

For details, see,
http://www.clippard.com/store/displa...asp?sku=MJTV-5

For additonal info on pneumatic valves, see,
http://www.clippard.com/downloads/ge...Pneumatics.pdf

Bob


On Tue, 23 Nov 2004 19:15:23 GMT, "Paul Remde" wrote:

Hi,

I received a few very nice e-mails from reputable sources recommending the
use of a pneumatic switch to switch between TE and Static input for a
motorglider. That is good information. This newsgroup is fantastic!

It was suggested that the switch could be made to be automatic. That sounds
great. It is my understanding that even very small leaks can cause large
inaccuracies in TE functionality - so we must be careful about that of
course. Does anyone have any recommendations for manual or automatic
pneumatic switches? It would be great to get feedback from someone who has
done this already.

Thank you,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com

"Paul Remde" wrote in message
news:NwKod.141170$R05.69144@attbi_s53...
Hi,

I have a question for motorglider owners. I sell variometers and TE
probes
but I'm still learning. A customer is building a Europa motorglider and
he
is wondering if he can mount a TE probe on the fin and connect it to the
variometer, or will the propwash cause problems. Is it necessary to use
some sort of pneumatic switch to switch between TE and static input for
the
variometer?

His pitot and static ports are on a boom that is mounted to the wing.

Thank you,

Paul Remde
Cumulus Soaring, Inc.
http://www.cumulus-soaring.com