Subject: Static port location X-FID: BA285063-5BCE-11D4-AF8D-0050DAC67E11 X-Priority: 3 --------------Boundary-00=_CKXIQL80000000000000 Content-Type: Multipart/Alternative; boundary="------------Boundary-00=_DKXILVC0000000000000" --------------Boundary-00=_DKXILVC0000000000000 Content-Type: Text/Plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable OK, I know this is off subject, but it IS on a rotary-powered RV-6.=0D =0D My static system pressure is off to the tune of 100 feet at cruise speeds= =2E =0D =0D Every airspeed indicator I tried (2) read 10 mph too high when calibrated using GPS triangulation. One day I glanced at my altimeter while making = a cruise speed pass down our home runway (close to the surface) and noticed that it read 100 ft higher than at rest. My calculations show that would also account for the +10 mph on the ASI.=0D =0D I have the standard hollow pop rivets at the standard Van's locations. C= an t imagine that the small rise on this rivet would drop the pressure that much! I have asked other RVs to also do this test, and they come in anywhere from 50 to 80 ft. high. I tried pulling the static line to let = the instruments use cockpit pressure (which I already knew was lower than static) and the altimeter read 850 ft!=0D =0D With all the brainpower available on this list, surely someone can sugges= t a method of attacking this problem. I could just continue subtracting 10 f= rom my indicated, but that is the easy way out. I was going to drill out the rivets and use a hole in the flat skin, but I just can't bring myself to mess up a great paint job. (Yet)=0D =0D Ideas?=0D =0D Bill Eslick=0D N268BL=0D www.weslick.com --------------Boundary-00=_DKXILVC0000000000000 Content-Type: Text/HTML; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

OK, I know this is off subject, but it IS on a rotary-powered = RV-6.

My static system pressure is off to the tune of 100 feet at cruise s= peeds.

Every airspeed indicator I tried (2) read 10 mph too high when calib= rated using GPS triangulation. One day I glanced at my altimet= er while making a cruise speed pass down our home runway (close to the su= rface) and noticed that it read 100 ft higher than at rest. My calc= ulations show that would also account for the +10 mph on the ASI.

I have the standard hollow pop rivets at the standard Van's location= s. Can't imagine that the small rise on this rivet would drop the p= ressure that much! I have asked other RVs to also do this test, and= they come in anywhere from 50 to 80 ft. high. I tried pulling the = static line to let the instruments use cockpit pressure (which I already = knew was lower than static) and the altimeter read 850 ft!

With all the brainpower available on this list, surely someone can s= uggest a method of attacking this problem. I could just continue su= btracting 10 from my indicated, but that is the easy way out. I was= going to drill out the rivets and use a hole in the flat skin, but I jus= t can't bring myself to mess up a great paint job. (Yet)

Ideas?

Bill Eslick

N268BL

www.weslick.com

______________________= ______________________________
<= A href=3D"http://www.incredimail.com/redir.asp?ad_id=3D309&lang=3D9">= 3D""

IncrediMail - Email has= finally evolved - = Click Here --------------Boundary-00=_DKXILVC0000000000000-- --------------Boundary-00=_CKXIQL80000000000000 Content-Type: image/gif; name="IMSTP.gif" Content-Transfer-Encoding: base64 Content-ID: <04D7F9E3-35C9-440C-9FC2-607054B53752> R0lGODlhFAAPALMIAP9gAM9gAM8vAM9gL/+QL5AvAGAvAP9gL////wAAAAAAAAAAAAAAAAAAAAAA AAAAACH/C05FVFNDQVBFMi4wAwEAAAAh+QQJFAAIACwAAAAAFAAPAAAEVRDJSaudJuudrxlEKI6B URlCUYyjKpgYAKSgOBSCDEuGDKgrAtC3Q/R+hkPJEDgYCjpKr5A8WK9OaPFZwHoPqm3366VKyeRt E30tVVRscMHDqV/u+AgAIfkEBWQACAAsAAAAABQADwAABBIQyUmrvTjrzbv/YCiOZGmeaAQAIfkE CRQACAAsAgABABAADQAABEoQIUOrpXIOwrsPxiQUheeRAgUA49YNhbCqK1kS9grQhXGAhsDBUJgZ AL2Dcqkk7ogFpvRAokSn0p4PO6UIuUsQggSmFjKXdAgRAQAh+QQFCgAIACwAAAAAFAAPAAAEEhDJ Sau9OOvNu/9gKI5kaZ5oBAAh+QQJFAAIACwCAAEAEAANAAAEShAhQ6ulcg7Cuw/GJBSF55ECBQDj 1g2FsKorWRL2CtCFcYCGwMFQmBkAvYNyqSTuiAWm9ECiRKfSng87pQi5SxCCBKYWMpd0CBEBACH5 BAVkAAgALAAAAAAUAA8AAAQSEMlJq7046827/2AojmRpnmgEADs= --------------Boundary-00=_CKXIQL80000000000000 Content-Type: Image/jpeg; name="BackGrnd.jpg" Content-ID: <94E0A030-CD60-4029-A781-573F199B3084> Content-Transfer-Encoding: base64 /9j/4AAQSkZJRgABAgAAZABkAAD/7AARRHVja3kAAQAEAAAAHgAA/+4AIUFkb2JlAGTAAAAAAQMA EAMCAwYAAAHbAAAC1gAABZX/2wCEABALCwsMCxAMDBAXDw0PFxsUEBAUGx8XFxcXFx8eFxoaGhoX Hh4jJSclIx4vLzMzLy9AQEBAQEBAQEBAQEBAQEABEQ8PERMRFRISFRQRFBEUGhQWFhQaJhoaHBoa JjAjHh4eHiMwKy4nJycuKzU1MDA1NUBAP0BAQEBAQEBAQEBAQP/CABEIAGUAcwMBIgACEQEDEQH/ xACAAAEBAQEAAAAAAAAAAAAAAAAAAQIGAQEBAAAAAAAAAAAAAAAAAAAAARABAAICAwEAAgMAAAAA AAAAAQARIQIxQRIiQDIQMFARAAICAgIBBAIDAQEAAAAAAAERACExQVFhcYGRobECEsHhMtHxEgEA AAAAAAAAAAAAAAAAAABQ/9oADAMBAAIRAxEAAADtRZYE1ASghQFgUZoCkKSwLmhcllAEqkSkqFAl hUomoAS3IoJqFlDNpFEAQFE1AIVYAWIVKAJRNZpYCwVmmshKACA0CBAUCBYGwf/aAAgBAgABBQD8 B/yP/9oACAEDAAEFAPz6/or8H//aAAgBAQABBQC2+ZeHjbD+saX6hwXeDW1Rg4xLLTa+m7ZiIEsI 1MTiHP1dYpvFADiFM1/X6nq9byuwdPPz5oFofWlEMQ9ULKrWq2ppG9Y2J6INQma9lVTRdlUKgHzX XSEECw1SYu5WsGoJPkisZYpx31GvXZQ/JM3VwShzVTsp1EZbBI8LcaUSih86+s2Zl4Wp6+lAZnVs Dkjdku5m+lJTdXDG2SHM9M2wKX1YxsaZTTwmoVrYnqsMrM652yjs01K0mtbGAz6Y5dpfqNz06qpq 5QNjiIjiZtbhtceNuf0jyeqGgu6rXMvI4omPWbPMYzEfMI+axHnFvOP4/9oACAECAgY/AGP/2gAI AQMCBj8AY//aAAgBAQEGPwB72Yucb1BfIhFEaeZ+xRXFQELN+HEUQdjU0Xn4g9gRCQcpw1yajGYs P/kFvUzvjUBWrIMFHI2OJQNEAjiEEFdTmfG/MTHq5RFOnpTV3kzCBx7x4YOD1AV5uYJvnqMA0hep jfwpYCwC4Bx3q55zeZRBCw9TkoIuHw78RdczSNH2mgqcLpRC+RASAkA3B13mcYd5mR84c/yOx4lW tRAZ6mGDhiP9WgXVyhWA+xDgMOWGMsTg/wBTz8SjjXrP8hHIlX1MZ6mDzgc/cIV/iyN1GBR0MQMK jnEzvvMz8mUkErKlfqU63iV+IKNH7mNZBLFQEpEDeDOV32IVn8WR4caoywqI2p695mbZzNUQIcKf k0bo+0NpCqn7CiQiNGXkdQen1DpjGeZ7WNw3pK+I93maCPc16+Zkf6XxMCsFwAkaiIB57vc/IAhZ /HqZBBbB0ZokAEOGxsYqBgPp8agQBu4VSMJdqx6SwDsGBrTmAR93uZGX6KePowEADAIjoX8gw459 CICaW/MLGvodQfkDW71zBxRHtB3j3jC4PMIYoAgKNfPMCQNN7jCzvlzXPopzhQvNZY3CRya9ZrEF fRE0iCB5mscZuVYfKmAi94uE3Q8qfytQ7xD0svmFcmaxNPI8iMjh3pmF2HbzqeUi+YkiD/MrOl5L mbwPuWVfmXpv3hDH8qAjPpiZHXkRnSd6ZhB53mejzKV6US0K9TCCLyCeIhtETX5MsHBGJkD/ANiF kMCE2qGoCdZ8Q8AMGpYFqEhdhRIYH3CF3d1M/Mexma+4CwdQ2Ddcx0exAlmj04QUQd8QWLB/iB5G xmEg5TENVZqPYzFV8eHAy9T/AEc8a4n3Ov6g/VwvE6lpQ4VNysXzhS8esOO8w/rlF/rypjV3B5H1 Knr8T//Z --------------Boundary-00=_CKXIQL80000000000000--