If you used these

http://www.cleavelandtool.com/Push-O.../#.WoSvpaJu6kI

then I believe they are *not* considered "flush". They do protrude above the skin, as noted in the description.

That's what I have, and airspeed seems to be right on the money.

(Note that I don't know for sure, but perhaps an earlier version of these *was* actually flush with the skin when installed?)

Must be.
I hadn't heard anything about it.
I imagine it is a vendor produced part being offered as an (additional) $30 option for those that don't want to use the blind rivet supplied in the $19 static system kit.

It all depends on the vintage of the parts that someone has....

I think Cleveland, Safeair, and perhaps others originally offered a rivet on static port that had a flush profile. After enough users had errors because of incorrect static pressure, they redesigned the part.

If someone has ports that look flat/flush to the outer skin, and do not protrude to mimic the recommended blind rivet, the should count on there being some error in their ASI and altimeter.

The original Safe-Air “flush” ports were most definitely wildly inaccurate. I saw cruise TAS errors nearing 10KTAS and commensurately large altitude errors.



The Cleveland ones that mimic the vans rivet I can report are super accurate.



This has been extensively covered before so worth a search.

The new vans screw version looks like a good compromise between the convenient but probably overkill push fitting Cleveland one and the rivet method which some people struggle with for various reasons.

Cheers

I bought the static ports from Cleaveland probably around 2002 and they were absolutely flush. I had errors (low and slow) that got worse with increasing airspeed.

Checked a lot of posts and it seemed that the Vans rivet static port worked well and people had a lot of trouble with other systems so I decided to stay with it and just change the internal tube connection. So - son machined a couple flanges with threads for Parker fittings, scuffed mating surfaces and applied a little proseal (just because) and pulled the flanges tight to the fuselage with the Vans rivets.

Picture during construction: