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rparigor(at)SUFFOLK.LIB.N
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 Posted: Wed Sep 20, 2006 8:23 am Post subject: Can someone share experience tuning static port? |
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I have a Europa XS Monowheel, it has the static port under the wing, it is
a tube with a closed nylon bullet at the tip, and 2 holes in it a bit aft
of the lead edge of the bullet, 1 vertical and 1 horizontal.
I heard a while back you can tune this static port by installing a O-Ring,
think start point was an inch or so behind the holes in the bullet??
Can someone share experience tuning static port?
How did you determine when it was correct?
What distance was neutral point for O-Ring?
Does moving O-Ring forward from neutral increase static pressure?
What size O-Ring did you use, did size make much a difference, what was
O-Ring made out of and how did you permanent bond in place?
Thx.
Ron Parigoris
(I posted to Europa group, no replies)
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khorton01(at)rogers.com
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| Posted: Wed Sep 20, 2006 5:37 pm Post subject: Can someone share experience tuning static port? |
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On 20 Sep 2006, at 12:22, <rparigor(at)SUFFOLK.LIB.NY.US> wrote:
| Quote: |
I have a Europa XS Monowheel, it has the static port under the
wing, it is
a tube with a closed nylon bullet at the tip, and 2 holes in it a
bit aft
of the lead edge of the bullet, 1 vertical and 1 horizontal.
I heard a while back you can tune this static port by installing a
O-Ring,
think start point was an inch or so behind the holes in the bullet??
Can someone share experience tuning static port?
How did you determine when it was correct?
What distance was neutral point for O-Ring?
Does moving O-Ring forward from neutral increase static pressure?
What size O-Ring did you use, did size make much a difference, what
was
O-Ring made out of and how did you permanent bond in place?
|
The first step is to do some very careful ground and flight testing
to determine what the current static system errors are, with the
static port as it is now. Then we can figure out whether the static
port is reading too high, or too low, and go through an iterative
process to hopefully improve things. Expect to invest several
flights to gather data for each different configuration tested.
First, you would need to do ground testing to determine the
instrument error in your ASI. You could have an instrument shop do
it, or you could make a water manometer. You also need to do careful
leak checks in the pitot and static systems.
Then, you need to do a bunch of flight tests to determine the error
in the airspeed system. A conventional pitot tube, aligned within
about 15 degrees of the airflow, clear of the boundary layer, clear
of the prop wash, and not in the wake of any obstruction should be
very accurate. Any airspeed error has to be either ASI instrument
error, or due to static system errors. You use the ground test data
to correct for ASI instrument error, and then we can figure out what
the static system error is.
I've got a lot more details on how to do the above ground and flight
testing on my web site. I am also prepared to work with you to help
you analyse the flight test results.
http://www.kilohotel.com/rv8/phplinks/out.php?&ID=31
An O - ring a bit ahead of the static port should decrease the
pressure sensed at the static port. An O-ring close behind the port
should increase the pressure sensed at the port.
Kevin Horton RV-8 (finishing kit)
Ottawa, Canada
http://www.kilohotel.com/rv8
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