Return-Path: Received: from fed1rmmtao03.cox.net ([68.230.241.36] verified) by logan.com (CommuniGate Pro SMTP 4.2b6) with ESMTP id 190324 for flyrotary@lancaironline.net; Sat, 19 Jun 2004 15:15:43 -0400 Received: from davidandanne ([68.111.224.107]) by fed1rmmtao03.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with SMTP id <20040619191511.JWBN28010.fed1rmmtao03.cox.net@davidandanne> for ; Sat, 19 Jun 2004 15:15:11 -0400 From: "DaveLeonard" To: "Rotary motors in aircraft" Subject: RE: [FlyRotary] Re: Static port location Date: Sat, 19 Jun 2004 12:15:16 -0700 Message-ID: MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_003C_01C455F7.14D939C0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 This is a multi-part message in MIME format. ------=_NextPart_000_003C_01C455F7.14D939C0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_003D_01C455F7.14D939C0" ------=_NextPart_001_003D_01C455F7.14D939C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Ed's Idea sounds like a great start, Bill. Thanks to bringing that to our attention, as I also have the stock static system. Maybe I can get mine fixed before I paint. :-) Dave Leonard Afraid I can't help you there, Bill. I used some machined static ports rather than the PoP riviets that Van suggests. I have heard of folks putting a bit of obstruction either before or behind the port to adjust the pressure it sees. They are pretty small so I am told and might work for you by adjusting the pressure the static port sees. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message ----- From: Bill Eslick To: Rotary motors in aircraft Sent: Friday, June 18, 2004 5:41 PM Subject: [FlyRotary] Static port location 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 speeds. 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. I have the standard hollow pop rivets at the standard Van's locations. Can'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! With all the brainpower available on this list, surely someone can suggest a method of attacking this problem. I could just continue subtracting 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 just can't bring myself to mess up a great paint job. (Yet) Ideas? Bill Eslick N268BL www.weslick.com ____________________________________________________ IncrediMail - Email has finally evolved - Click Here ------=_NextPart_001_003D_01C455F7.14D939C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Ed's Idea sounds like a great = start,=20 Bill. Thanks to bringing that to our attention, as I also have the = stock=20 static system. Maybe I can get mine fixed before I paint. =20 :-)

Dave Leonard

Afraid I can't help you there, = Bill. I=20 used some machined static ports rather than the PoP riviets that Van=20 suggests. I have heard of folks putting a bit of obstruction = either=20 before or behind the port to adjust the pressure it sees. They = are=20 pretty small so I am told and might work for you by adjusting the = pressure the=20 static port sees.

Ed

Ed Anderson
RV-6A N494BW Rotary = Powered
Matthews,=20 NC

----- Original Message -----
From:=20 Bill Eslick=20
To: Rotary motors in = aircraft=20

Sent: Friday, June 18, 2004 = 5:41=20 PM

Subject: [FlyRotary] Static = port=20 location

OK, I know this is off subject, but it IS on a=20 rotary-powered RV-6.

My static system pressure is off to the tune of 100 feet = at=20 cruise speeds.

Every airspeed indicator I tried (2) read 10 mph too high = when=20 calibrated using GPS triangulation. One day I = glanced at my=20 altimeter while making a cruise speed pass down our home = runway (close=20 to the surface) and noticed that it read 100 ft higher than at = rest. My calculations show that would also account for = the +10=20 mph on the ASI.

I have the standard hollow pop rivets at the standard = Van's=20 locations. Can't imagine that the small rise on this = rivet would=20 drop the pressure that much! I have asked other RVs to = also do=20 this test, and they come in anywhere from 50 to 80 ft. = high. I=20 tried pulling the static line to let the instruments use = cockpit=20 pressure (which I already knew was lower than static) and the=20 altimeter read 850 ft!

With all the brainpower available on this list, surely = someone=20 can suggest a method of attacking this problem. I could = just=20 continue subtracting 10 from my indicated, but that is the = easy way=20 out. I was going to drill out the rivets and use a hole = in the=20 flat skin, but I just can't bring myself to mess up a great = paint job.=20 (Yet)

Ideas?

Bill Eslick

N268BL

www.weslick.com

____________________________________________________
IncrediMail - Email has finally = evolved -=20 Click=20 = Here

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