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ron.mcgann(at)baesystems. Guest
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Posted: Tue Mar 14, 2006 8:56 pm Post subject: Cleaveland Static Port |
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Hey Tim and other 10 flyers,
I have the Cleaveland static port installed in the tailcone. Tim and others with this port, how accurate are you finding the altimeter and airspeed indications with this port?
thanks in advance
Ron
187 fuse
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Tim(at)MyRV10.com Guest
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Posted: Wed Mar 15, 2006 4:18 am Post subject: Cleaveland Static Port |
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I haven't flown the box to verify how exact the airspeed display is,
but in very light to no wind type conditions my Chelton GPS, that
is constantly computing Crosswind, True Airspeed, Groundspeed,
and everything else has seemed to indicate that my groundspeed
is very near my true airspeed at the lower altitudes that I've
been flying. I flew next to another RV who knew his airspeed
indicated a bit high, (like 5-10 kts) and we were indicatating about
8-10 kts different...me being lower. So just a guess but the
evidence is pointing to there not being any real error there.
As for static, I think that would be very hard to tell as I
would doubt it would affect the altimeter that much overall.
I had my pitot static test done and my altitude display is accurate
to within 7' all the way to 20,000 (a non-flying test). I'll
have to maybe call ATC and have them radar verify my altitude or
something. Anyway, in practice approaches it places me right
at ground level at the perfect time, so I can't see it being off.
That's one cool thing I found about the Chelton/GRT combo. I'm
not sure that this isn't the case with all other EFIS's, but
when I power up for the day, my EFIS will look at the airport
you're at, and calculate based on the pressure and GPS altitude
of the airport what your altimeter setting should be and it
presets itself. It's designed so even if you don't set the
altimeter, you should be within a couple of hundreths of an
inch of the proper altimeter setting, and it's usually accurate
to within 10' of airport elevation. Cool stuff.
Other than calling ATC, and flying the box, I don't know what else
I can do to verify closer, but from what it appears so far, I
have dropped my worries about the accuracy of the Cleaveland
static ports. Of course, if it were 1 or 2 kts off, which is
easily possible, I probably wouldn't worry about it anyway.
It's just nice to know what it truly is indicating. We end up
setting our stall speeds based on IAS, and we all end up
using Ground Speed with GPS for the most part anyway.
Tim Olson - RV-10 N104CD - Flying
do not archive
McGANN, Ron wrote:
[quote] Hey Tim and other 10 flyers,
I have the Cleaveland static port installed in the tailcone. Tim and
others with this port, how accurate are you finding the altimeter and
airspeed indications with this port?
thanks in advance
Ron
187 fuse
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mike(at)cleavelandtool.co Guest
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Posted: Wed Mar 15, 2006 8:13 am Post subject: Cleaveland Static Port |
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I am glad to hear that they are working well on Tim's. I wanted to clarify
that they also work well on thousands of other aircraft. The few that they
do not work well on were installed incorrectly. Keep in mind that they must
protrude from the surface of the skin. If you do not countersink correctly
for the mounting dimples they will not sit flush. If you add thickness with
primer, proseal, rtv... between the port and the skin they will not work
properly. If you paint the skin on the outside with more than .010" of
paint, but mask off the port, they will not work properly.
However we have tried to make them (how do I say it?) less dependent on
accuracy of installation, by creating a slight dome on the new ports. When
installed correctly this will allow them to protrude .030" which is similar
to the pop rivet method, and they will still be flush at the edges. When
installed incorrectly you have three times the margin of error than before.
-Mike
Mike Lauritsen
Cleaveland Aircraft Tool
2225 First St.
Boone, Iowa 50036
515-432-6794
mike(at)cleavelandtool.com
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