flyrotary@lancaironline.net Mailing List Archive

You might get half of a pea (not kidding - they did this on the Spitfire in WWII) and try pasting approx 1/8" (final distance may vary) behind your fuselage static port. This could reduce some of the "suction" that is causing your altimeter to read high by building up positive pressure in from of the pea and increasing the pressure at the port. Actually, the Brits stuck 1/2 peas on the Spitfire in an attempt to find out where flush rivets may a difference or not - so I read.

Any half hemisphere, small object work probably do if you are fresh out of dried peas

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC

----- Original Message -----

From: Bill Eslick

To: Rotary motors in aircraft

Sent: Saturday, June 19, 2004 7:36 PM

Subject: [FlyRotary] Re: Static port location

Ed,

I'd be real happy with that error. Today I made a static probe and mounted it under the wing like the pitot probe. It has 8 holes, 1/16" diameter. They are in pairs about 1/4" apart, and each pair is 90 degrees off the last pair. (Confused yet?) It is a removable probe so that I can try different versions until I find the best. This one is blunt-nosed (courtesy of J-B Kwik).

This version reduced the altimeter error to 50-70 ft high and the indicated to around 7 KTs too high.

Not sure what to try for the next version.

Bill Eslick

-------Original Message-------

From: Rotary motors in aircraft

Date: 06/19/04 15:33:42

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: Static port location

Just for the record, when I did my GPS triangulation Airspeed check, my indicated airspeed was 3 MPH high at around 190mph and within one MPH at 120 MPH. I never checked out the stall speed, but it seems within 2-3 MPH.

Ed

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