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Cleaveland Static Port

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ron.mcgann(at)baesystems.
Guest

Posted: Tue Mar 14, 2006 8:56 pm Post subject: Cleaveland Static Port

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

Posted: Wed Mar 15, 2006 4:18 am Post subject: Cleaveland Static Port

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

Posted: Wed Mar 15, 2006 8:13 am Post subject: Cleaveland Static Port

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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