X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail08.syd.optusnet.com.au ([211.29.132.189] verified) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTPS id 900571 for flyrotary@lancaironline.net; Thu, 21 Apr 2005 02:27:22 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.189; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-69-134.dsl.nsw.optusnet.com.au [211.31.69.134]) by mail08.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j3L6QQah021996 for ; Thu, 21 Apr 2005 16:26:32 +1000 Message-ID: <004201c5463b$99123810$86451fd3@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Finn NOT 2mm Seals - 2mm Slots Re: [FlyRotary] Re: New Rotors! Date: Thu, 21 Apr 2005 16:20:19 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01C5468E.02815D60" 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 This is a multi-part message in MIME format. ------=_NextPart_000_001B_01C5468E.02815D60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ed, That's it mate - standard clearance .062mm to .102. Clearance limit .15 - I guess anything over .15mm is too sloppy and = could cause the problems you have seen. So say the manual. George ( down under) 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_001B_01C5468E.02815D60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Ed,

That's it mate - standard clearance = .062mm to=20 .102.

Clearance limit .15 - I guess anything = over .15mm=20 is too sloppy and could cause the problems you have seen.

So say the manual.

George ( down under)

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=20 seal in the slot and the smallest leaf gauge I have in the set is = 0.0015"=20 (.0381mm) and it was a tight fit and would not go in some cases = indicating the=20 clearance between apex seal and wall is 0.0015" OR LESS. The = measurement=20 would indicate closer to .0010" or 0.0254mm, so a reasonably = tight fit=20 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=20 {:>)

Ed

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

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=20 ever seen a new rotor - the are bright metallic=20 {:>).

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=20 took the time to deburr the slot.

Just in case any of you ever = wonder whether=20 you are looking at a 9.7:1 rotor or some other rotor, there is a = fairly=20 easy way to tell. Lay a straight edge across the depression = in the=20 rotor and measure from its bottom to the center of the depression, = it=20 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,=20 NC
eanderson@carolina.rr.com

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