Hercules Engines

On Fri, 16 Jan 2004 07:13:54 -0800, "Tarver Engineering"
wrote:


"Phil Miller" wrote in message
news

Hey Splappy,

Do you remember this series of pronouncements;

From: "Tarver Engineering"
Newsgroups: rec.aviation.military
Subject: Do Hercules military aircraft use the same fuel as civilian
aircraft?
Date: Fri, 8 Nov 2002 19:19:37 -0800
snip
wrote in message
Not really. On the T56 engine TIT = (T)urbine (I)nlet (T)empreture.

Yes really, on every jet engine TIT is Total Inlet Temperature.

Yep.

I ask because I came across an interesting paragraph in the T56-A-15
service manual yesterday. Went like this...

"Description and operation of turbine inlet temperature indicating and
control system. [Hmmm, not total, turbine.]

....measures the turbine inlet temperature by means of
thermocouples...Eighteen thermocouple assemblies are mounted in the
turbine inlet casing of each engine...One thermocouple of each assembly
is connected to the turbine inlet temperature indicating system,
and...one...is connected to the electronic datum control system. The 18
indicating system thermocouples are connected in parallel [!!] by the
indicator turbine thermocouple harness assembly, and this signal is
transmitted to a turbine inlet temperature indicator in the engine
instrument panel. The 18 control system thermocouples are connected in
parallel..."

So, let's revise.

From: "Tarver Engineering"

Yes really, on every jet engine TIT is Total Inlet Temperature.

Yes Rick, the thermocouples at the turbine inlet are connected in
series.

Tsk, tsk, tsk ... sticks and stones and all that but for averaging,
themocouples are wired in parallel.

No way, that would be stupid.

Turbine Inlet Temperature is jsut what it says it is. On the T-56 it is
obtained by averaging the output of 18 thermocouples wired in parallel

That is a lot of wire, perhaps you would like to rethink your rediculess
assertion.

and eve though they are as wrong as the rest of us in this thread, the
Air Force, Rolls Royce, Allison, and even the Navy refer to T-5 as
TURBINE INLET TEMPERATURE.

That is fine for the PFM crowd, but quite incorrect.


Have you considered yet, Miller, that your zero knowledge of aircraft makes
for a pretty rediculess archive troll?

For Pete's sake! The word is ridiculous.

Phil
--
Talk sense to a fool and he calls you foolish.
Euripides

"Phil Miller" wrote...

Yes really, on every jet engine TIT is Total Inlet Temperature.

Yep.

I ask because I came across an interesting paragraph in the T56-A-15
service manual yesterday. Went like this...

...measures the turbine inlet temperature by means of
thermocouples...Eighteen thermocouple assemblies are mounted in the
turbine inlet casing of each engine...One thermocouple of each assembly
is connected to the turbine inlet temperature indicating system,
and...one...is connected to the electronic datum control system. The 18
indicating system thermocouples are connected in parallel [!!] by the
indicator turbine thermocouple harness assembly,

I'm surprised you ever doubted the truth on this one!


So, let's revise.

That's going a bit too far... Nobody can revise the Tarver Chronicles! :-)

"John R Weiss" wrote in
news:Sp%Nb.73504$nt4.98595@attbi_s51:

"Phil Miller" wrote...

Yes really, on every jet engine TIT is Total Inlet Temperature.

Yep.

I ask because I came across an interesting paragraph in the T56-A-15
service manual yesterday. Went like this...

...measures the turbine inlet temperature by means of
thermocouples...Eighteen thermocouple assemblies are mounted in the
turbine inlet casing of each engine...One thermocouple of each
assembly is connected to the turbine inlet temperature indicating
system, and...one...is connected to the electronic datum control
system. The 18 indicating system thermocouples are connected in
parallel [!!] by the indicator turbine thermocouple harness assembly,

I'm surprised you ever doubted the truth on this one!


So, let's revise.

That's going a bit too far... Nobody can revise the Tarver
Chronicles! :-)


bimetallic thermocouples generate millivolt signals,and paralleling them
would not work.Standard practice is to series-connect them,and compare to a
reference junction.Do these assemblies include signal processing to convert
the mV signal to a digital form,which could then be sent on a parallel bus?

--
Jim Yanik
jyanik-at-kua.net

Jim Yanik wrote:

bimetallic thermocouples generate millivolt signals,and paralleling them
would not work.

You can go back to sleep now.

Rick

"Rick" wrote in message
ink.net...
Jim Yanik wrote:

bimetallic thermocouples generate millivolt signals,and paralleling them
would not work.

You can go back to sleep now.

Unbelieveable.

The irony of it all.

Rick wrote in
ink.net:

Jim Yanik wrote:

bimetallic thermocouples generate millivolt signals,and paralleling
them would not work.

You can go back to sleep now.

Rick


Well,that was an informative post.Best you could do,I suppose.
'plonk'.

--
Jim Yanik
jyanik-at-kua.net

From: Jim Yanik
Date: 1/16/2004 6:53 PM Central Standard Time
Message-id:

"John R Weiss" wrote in
news:Sp%Nb.73504$nt4.98595@attbi_s51:

"Phil Miller" wrote...

Yes really, on every jet engine TIT is Total Inlet Temperature.

Yep.

I ask because I came across an interesting paragraph in the T56-A-15
service manual yesterday. Went like this...

...measures the turbine inlet temperature by means of
thermocouples...Eighteen thermocouple assemblies are mounted in the
turbine inlet casing of each engine...One thermocouple of each
assembly is connected to the turbine inlet temperature indicating
system, and...one...is connected to the electronic datum control
system. The 18 indicating system thermocouples are connected in
parallel [!!] by the indicator turbine thermocouple harness assembly,

I'm surprised you ever doubted the truth on this one!


So, let's revise.

That's going a bit too far... Nobody can revise the Tarver
Chronicles! :-)


bimetallic thermocouples generate millivolt signals,and paralleling them
would not work.Standard practice is to series-connect them,and compare to a
reference junction.Do these assemblies include signal processing to convert
the mV signal to a digital form,which could then be sent on a parallel bus?

--
Jim Yanik
jyanik-at-kua.net

On every aircraft I ever worked on thermocouples were in parallel if there were
two or more.

Dan, U.S. Air Force, retired

"B2431" wrote in message
...

On every aircraft I ever worked on thermocouples were in parallel if there
were
two or more.

What engine shop did you work in, Dan?

(B2431) wrote in
:

From: Jim Yanik
Date: 1/16/2004 6:53 PM Central Standard Time
Message-id:

"John R Weiss" wrote in
news:Sp%Nb.73504$nt4.98595@attbi_s51:

"Phil Miller" wrote...

Yes really, on every jet engine TIT is Total Inlet Temperature.

Yep.

I ask because I came across an interesting paragraph in the
T56-A-15 service manual yesterday. Went like this...

...measures the turbine inlet temperature by means of
thermocouples...Eighteen thermocouple assemblies are mounted in the
turbine inlet casing of each engine...One thermocouple of each
assembly is connected to the turbine inlet temperature indicating
system, and...one...is connected to the electronic datum control
system. The 18 indicating system thermocouples are connected in
parallel [!!] by the indicator turbine thermocouple harness
assembly,

I'm surprised you ever doubted the truth on this one!


So, let's revise.

That's going a bit too far... Nobody can revise the Tarver
Chronicles! :-)


bimetallic thermocouples generate millivolt signals,and paralleling
them would not work.Standard practice is to series-connect them,and
compare to a reference junction.Do these assemblies include signal
processing to convert the mV signal to a digital form,which could then
be sent on a parallel bus?

--
Jim Yanik
jyanik-at-kua.net

On every aircraft I ever worked on thermocouples were in parallel if
there were two or more.

Dan, U.S. Air Force, retired


Well,I guess they aren't bimetallic thermocouples,then.
Anyone have any speculation on what sort of signal will work with a
parallel connection?

--
Jim Yanik
jyanik-at-kua.net

"Jim Yanik" wrote in message
...
(B2431) wrote in
:

On every aircraft I ever worked on thermocouples were in parallel if
there were two or more.

Well,I guess they aren't bimetallic thermocouples,then.
Anyone have any speculation on what sort of signal will work with a
parallel connection?

You would have to first understand that Dan makes his statement based on
absolutely nothing.