Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b6) with ESMTP id 190397 for flyrotary@lancaironline.net; Sat, 19 Jun 2004 16:26:58 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i5JKQNiB016520 for ; Sat, 19 Jun 2004 16:26:24 -0400 (EDT) Message-ID: <000d01c4563b$b3365c80$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Static port location Date: Sat, 19 Jun 2004 16:26:27 -0400 MIME-Version: 1.0 Content-Type: multipart/related; type="multipart/alternative"; boundary="----=_NextPart_000_0009_01C4561A.2BF06610" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0009_01C4561A.2BF06610 Content-Type: multipart/alternative; boundary="----=_NextPart_001_000A_01C4561A.2BF06610" ------=_NextPart_001_000A_01C4561A.2BF06610 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: DaveLeonard=20 To: Rotary motors in aircraft=20 Sent: Saturday, June 19, 2004 3:15 PM Subject: [FlyRotary] Re: Static port location 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 =20 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 -----=20 From: Bill Eslick=20 To: Rotary motors in aircraft=20 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. =20 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 =20 =20 =20 ____________________________________________________ IncrediMail - Email has finally evolved - Click Here ------=_NextPart_001_000A_01C4561A.2BF06610 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Just for the record, when I did my = GPS=20 triangulation Airspeed check, my indicated airspeed was 3 MPH high at = around=20 190mph and within one MPH at 120 MPH.  I never checked out the = stall speed,=20 but it seems within 2-3 MPH.
 
Ed
 
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 DaveLeonard=20
Sent: Saturday, June 19, 2004 = 3:15=20 PM
Subject: [FlyRotary] Re: Static = port=20 location

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 = 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=20 the static port sees.
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary = Powered
Matthews,=20 NC
----- Original Message ----- =
From:=20 Bill=20 Eslick
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=20 my altimeter while making a cruise speed pass down our home = runway=20 (close to the surface) and noticed that it read 100 ft = higher than=20 at rest.  My calculations show that would also account = for the=20 +10 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=20 would drop the pressure that much!  I have asked other = RVs to=20 also do this test, and they come in anywhere from 50 to 80 = ft.=20 high.  I tried pulling the static line to let the = instruments=20 use cockpit pressure (which I already knew was lower than = static)=20 and the 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=20 job. (Yet)
 
Ideas?
 
Bill Eslick
N268BL
 
____________________________________________________
  IncrediMail - = Email has=20 finally evolved - Click=20 = Here
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