X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 998309 for flyrotary@lancaironline.net; Sat, 25 Feb 2006 19:53:09 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-04-eri0.southeast.rr.com (8.13.4/8.13.4) with SMTP id k1Q0qJOQ018882 for ; Sat, 25 Feb 2006 19:52:22 -0500 (EST) Message-ID: <001701c63a6e$ee71d950$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Hi Chuck [FlyRotary] Rotor identification Date: Sat, 25 Feb 2006 19:52:33 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0014_01C63A45.04EDB700" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0014_01C63A45.04EDB700 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageHi Chuck Here is what I found about some of the different compression rotors. If = you lay a straight edge across the depression longwise and measure from = the bottom of the straight edge to the deepest part of the depression = this what I have found: for the 9.7:1 the depth is 4mm, for the 9.4:1 = it is 5.5mm and the 9.1 is 7 mm. I have nothing to determine their = weight other than the compression/weight correlation. Also, I would carefully check the apex seal slots, they can be worn on = used rotors and that is what I am convinced caused my apex seal to = break. They become "v" at the top and no longer provide the wall = support for the top of the seal, the center of the seal tends to break = and leave the slot causing other damage. Lynn Hanover provided this quick check. If you stick the end of an = apex seal length wise into the slot (keeping it vertical) and move it = from side to side so that it touches first one side of the slot and then = the other, the far end of the seal should move in an arc of no more than = 3/16" of an inch - if it move more than that the slots have "V" passed = specifications. When you get the time, we all would like to hear what you found and what = you believe the cause. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ----- Original Message -----=20 From: Chuck Dunlap=20 To: Rotary motors in aircraft=20 Sent: Saturday, February 25, 2006 6:48 PM Subject: [FlyRotary] Rotor identification I bought this pair of used rotors to build up a new motor so I can = retrieve my RV-6. They look different in the compression chamber "tub" = area, otherwise they look identical. They both are marked "D" for the = weight code. Can anyone identify these and verify if they are OK to use = ? I am thinking if the compression ratio is different, it may run rough = even if they weigh the same. I remember Ed posting something about a way = to measure the depth, but I cannot find it in my sea of saved emails. Chuck Dunlap N616RV 13B -------------------------------------------------------------------------= ----- -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_0014_01C63A45.04EDB700 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Hi Chuck
 
Here is what I found about some of the different = compression rotors.  If you lay a straight edge across the = depression=20 longwise and measure from the bottom of the straight edge to the deepest = part of=20 the depression this what I have found: for the = 9.7:1 the=20 depth is 4mm, for the 9.4:1  it is 5.5mm and the 9.1 is 7 mm.  = I have=20 nothing to determine their weight other than the compression/weight=20 correlation.
 
Also, I would carefully check the apex seal = slots, they=20 can be worn on used rotors and that is what I am convinced caused my = apex seal=20 to break.  They become "v" at the top and no longer provide the = wall=20 support for the top of the seal, the center of the seal tends to break = and leave=20 the slot causing other damage.
 
 Lynn Hanover provided this quick = check. =20  If you stick the end of an apex seal length wise into the slot = (keeping it=20 vertical) and move it from side to side so that it touches first one = side of the=20 slot and then the other, the far end of the seal should move in an arc = of no=20 more than 3/16" of an inch - if it move more than that the slots have = "V" passed=20 specifications.
 
When you get the time, we all would like to hear = what you=20 found and what you believe the cause.
 
Ed
 
Ed Anderson
Rv-6A N494BW Rotary = Powered
Matthews,=20 NC
eanderson@carolina.rr.com
 
 
----- Original Message -----
From:=20 Chuck = Dunlap=20
Sent: Saturday, February 25, = 2006 6:48=20 PM
Subject: [FlyRotary] Rotor=20 identification

I = bought this pair=20 of used rotors to build up a new motor so I can retrieve my RV-6. They = look=20 different in the compression chamber "tub" area, otherwise they=20 look identical. They both are marked "D" for the weight code. Can = anyone=20 identify these and verify if they are OK to use ? I am thinking if the = compression ratio is different, it may run rough even if = they weigh=20 the same. I remember Ed posting something about a way to measure the = depth,=20 but I cannot find it in my sea of saved emails.
 
Chuck=20 Dunlap
N616RV=20 13B

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Homepage:  http://www.flyrotary.com/
Archive and=20 UnSub:  =20 http://mail.lancaironline.net/lists/flyrotary/
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