Today's Message Index:
----------------------
1. 01:07 AM - UMA 1 1/4" instruments (Phil Ayrton)
2. 06:47 AM - ()
3. 07:53 AM - Re: UMA 1 1/4" instruments (Ron Carter)
Message 1
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| Subject: | UMA 1 1/4" instruments |
I have just completed an RV-4 180hp project, and have used some of the
small UMA 1 1/4" instruments (oil pressure, oil temperature and fuel
pressure) to help save space on the small RV-4 panel. They look great,
but I have a problem with them during flight. I am getting wildly
erratic readings while flying. My oil pressure gauge sometimes reads
80-90psi, then will drop to zero, and often sits at zero while flying
after showing a sensible reading at start up and run up, and it often
flickers inflight. The low pressure light has not come on and the
engine has always remained operational, also my oil temp gauge initially
appears to operate as expected then runs up to the 300 deg F peg, then
back to 250, back to 300 for a minute or more. After aborting these
flights and returning to base under partial power the engine shows no
sign of damage or overheating. I have just ordered a new oil temp
probe and oil pressure sensor from Aircraft Spruce to take away any
suspicion of incorrect sensors, but I think I may have an
electrical/wiring problem. There was no wiring diagram in the box when
these arrived from Spruce and so far my email to UMA remains unanswered.
I notice some of the Rocket photos show these gauges.
Can anyone provide information on these gauges, their reliability and
performance during flight. Any other suggestions regarding wiring
checks would also be greatly appreciated.
Philip Ayrton
Australia
Message 2
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--> Rocket-List message posted by: <laboggan@mywdo.com>
Your engine gauges HAVE to be grounded to the engine
itself. Not the instrument panel or anywhere inside the
plane.
It can change the readings drastically.
Might be the cause.
do not archive
Message 3
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| Subject: | Re: UMA 1 1/4" instruments |
I have a UMA fuel pressure gauge. It bounces quite a bit,+ - 12 psi
sometimes. Then other times it is totally stable. I have tried three of
them over the years with pretty much the same result for all of them.
Ron Carter, HR2
----- Original Message -----
From: Phil Ayrton
To: rocket-list@matronics.com
Sent: Friday, June 16, 2006 2:03 AM
Subject: Rocket-List: UMA 1 1/4" instruments
I have just completed an RV-4 180hp project, and have used some of the
small UMA 1 1/4" instruments (oil pressure, oil temperature and fuel
pressure) to help save space on the small RV-4 panel. They look great,
but I have a problem with them during flight. I am getting wildly
erratic readings while flying. My oil pressure gauge sometimes reads
80-90psi, then will drop to zero, and often sits at zero while flying
after showing a sensible reading at start up and run up, and it often
flickers inflight. The low pressure light has not come on and the
engine has always remained operational, also my oil temp gauge initially
appears to operate as expected then runs up to the 300 deg F peg, then
back to 250, back to 300 for a minute or more. After aborting these
flights and returning to base under partial power the engine shows no
sign of damage or overheating. I have just ordered a new oil temp
probe and oil pressure sensor from Aircraft Spruce to take away any
suspicion of incorrect sensors, but I think I may have an
electrical/wiring problem. There was no wiring diagram in the box when
these arrived from Spruce and so far my email to UMA remains unanswered.
I notice some of the Rocket photos show these gauges.
Can anyone provide information on these gauges, their reliability and
performance during flight. Any other suggestions regarding wiring
checks would also be greatly appreciated.
Philip Ayrton
Australia
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