X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 900390 for flyrotary@lancaironline.net; Wed, 20 Apr 2005 20:19:15 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-185-127.carolina.res.rr.com [24.74.185.127]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j3L0IS0W012617 for ; Wed, 20 Apr 2005 20:18:29 -0400 (EDT) Message-ID: <000801c54607$a6f6e180$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Finn NOT 2mm Seals - 2mm Slots Re: [FlyRotary] Re: New Rotors! Date: Wed, 20 Apr 2005 20:18:30 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C545E6.1EAA7790" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C545E6.1EAA7790 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Finn, the Mystery is solved.=20 The seals themselves are .075" or 1.905mm thick not 2mm, The slots are = approx 1.93mm wide - closer to 2mm but not quite there either. My = previous slot width numbers were in error. I discovered that I = apparently was not holding the dial calipers perpendicular to the slot, = it makes a different. After slowly rocking the calipers, I could find = Perpendicular. I also stuck a seal in the slot and the smallest leaf = gauge I have in the set is 0.0015" (.0381mm) and it was a tight fit and = would not go in some cases indicating the clearance between apex seal = and wall is 0.0015" OR LESS. The measurement would indicate closer to = .0010" or 0.0254mm, so a reasonably tight fit compared to the 0.18mm = gap I had in some slots on the old rotor. Something like 7 times the = new clearance! Hope this enables you to sleep tonight, Finn {:>) Ed ----- Original Message -----=20 From: Finn Lassen=20 To: Rotary motors in aircraft=20 Sent: Wednesday, April 20, 2005 10:27 AM Subject: [FlyRotary] Re: New Rotors! Those numbers do not make sense. Aren't the seal 2 mm? How will they = fit in a 1.778mm groove? Finn Ed Anderson wrote: Got the new rotors today - first time I've ever seen a new rotor - = the are bright metallic {:>).=20 The depth of the apex seal slot on the new rotors ranged from 9.65mm = to 9.77 mm. Interestingly the width of the bottom of the apex slot was = 1.88mm but the top was narrower at 1.778mm. I noticed that the lip of = the apex seal slot had a tiny burr of metal along it as if they were not = using a sharp enough tool or else pushing it along too fast. Or perhaps = no one took the time to deburr the slot. Just in case any of you ever wonder whether you are looking at a = 9.7:1 rotor or some other rotor, there is a fairly easy way to tell. = Lay a straight edge across the depression in the rotor and measure from = its bottom to the center of the depression, it should measure right at 4 = mm. The 9.1 measure around 7mm for comparison. Just thought you might = want to know. Ed Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ------=_NextPart_000_0005_01C545E6.1EAA7790 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Finn, the Mystery is = solved.

The seals themselves are .075" or = 1.905mm=20 thick not 2mm, The slots are approx 1.93mm wide - closer to 2mm but = not=20 quite there either. My previous slot width numbers were in=20 error. I discovered that I apparently was not holding the dial = calipers=20 perpendicular to the slot, it makes a different. After slowly = rocking the=20 calipers, I could find Perpendicular. I also stuck = a seal=20 in the slot and the smallest leaf gauge I have in the set is 0.0015" = (.0381mm)=20 and it was a tight fit and would not go in some cases indicating the = clearance=20 between apex seal and wall is 0.0015" OR LESS. The measurement = would=20 indicate closer to .0010" or 0.0254mm, so a reasonably tight fit = compared=20 to the 0.18mm gap I had in some slots on the old rotor. Something = like 7=20 times the new clearance!

Hope this enables you to sleep tonight, = Finn=20 {:>)

----- Original Message -----
From:=20 Finn=20 Lassen
To: Rotary motors in = aircraft

Sent: Wednesday, April 20, 2005 = 10:27=20 AM

Subject: [FlyRotary] Re: New=20 Rotors!

Those numbers do not make sense. Aren't the seal = 2 mm?=20 How will they fit in a 1.778mm groove?

Finn

Ed Anderson=20 wrote:

Got the new rotors today - first = time I've ever=20 seen a new rotor - the are bright metallic = {:>).

The = depth of the apex=20 seal slot on the new rotors ranged from 9.65mm to 9.77 mm. =20 Interestingly the width of the bottom of the apex slot was 1.88mm = but the=20 top was narrower at 1.778mm. I noticed that the lip of the = apex seal=20 slot had a tiny burr of metal along it as if they were not using a = sharp=20 enough tool or else pushing it along too fast. Or perhaps no = one took=20 the time to deburr the slot.

Just in case any of you ever wonder = whether you=20 are looking at a 9.7:1 rotor or some other rotor, there is a fairly = easy way=20 to tell. Lay a straight edge across the depression in the = rotor and=20 measure from its bottom to the center of the depression, it should = measure=20 right at 4 mm. The 9.1 measure around 7mm for = comparison. Just=20 thought you might want to know.

Ed

Rv-6A N494BW Rotary = Powered
Matthews,=20 NC
eanderson@carolina.rr.com

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