X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from S1.cableone.net ([24.116.0.227] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 998380 for flyrotary@lancaironline.net; Sat, 25 Feb 2006 22:10:45 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.116.0.227; envelope-from=crayd@cableone.net Received: from chuckathlon (unverified [69.92.218.28]) by S1.cableone.net (CableOne SMTP Service S1) with ESMTP id 47948272 for ; Sat, 25 Feb 2006 20:10:33 -0700 Return-Path: From: "Chuck Dunlap" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Hi Chuck [FlyRotary] Rotor identification Date: Sat, 25 Feb 2006 20:09:58 -0700 Message-ID: <000a01c63a82$209bf8d0$6501a8c0@chuckathlon> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000B_01C63A47.743D20D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.3416 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2727.1300 In-Reply-To: Importance: Normal X-NotAscii: charset=us-ascii X-IP-stats: Incoming Last 0, First 13, in=5, out=0, spam=0 X-External-IP: 69.92.218.28 X-Abuse-Info: Send abuse complaints to abuse@cableone.net This is a multi-part message in MIME format. ------=_NextPart_000_000B_01C63A47.743D20D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Thanks Ed, that is just what I was looking for. Those masurements prove that one is a 9.7 and one is a 9.4, just as Kelly surmised from the photo. Fortunately I have another rotor that matches the 9.4 so I still have a good pair. I will check the apex slots as soon as I get them cleaned up. It will be at least another week before I can get the bad motor home and torn apart, I will sure post the results as soon as I can. =20 Chuck -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson Sent: Saturday, February 25, 2006 5:53 PM To: Rotary motors in aircraft Subject: [FlyRotary] Hi Chuck [FlyRotary] Rotor identification Hi Chuck =20 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. =20 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. =20 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. =20 When you get the time, we all would like to hear what you found and what you believe the cause. =20 Ed =20 Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com =20 =20 ----- 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. =20 Chuck Dunlap N616RV 13B _____ =20 -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ ------=_NextPart_000_000B_01C63A47.743D20D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Thanks=20 Ed, that is just what I was looking for. Those masurements prove that = one is a=20 9.7 and one is a 9.4, just as Kelly surmised from the=20 photo.
Fortunately I have another rotor that matches the 9.4 so I = still have a=20 good pair.
I will=20 check the apex slots as soon as I get them cleaned up. It will be at = least=20 another week before I can get the bad motor home and torn apart, I will = sure=20 post the results as soon as I can.
 
Chuck
-----Original Message-----
From: = Rotary motors in=20 aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed=20 Anderson
Sent: Saturday, February 25, 2006 5:53 = PM
To:=20 Rotary motors in aircraft
Subject: [FlyRotary] Hi Chuck = [FlyRotary]=20 Rotor identification

Hi Chuck
 
Here is what I found about some of the = different=20 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=20 of the depression this what I have found: for the=20 9.7:1 the depth is 4mm, for the 9.4:1  it is 5.5mm and the 9.1 is = 7=20 mm.  I have nothing to determine their weight other than the=20 compression/weight 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=20 leave 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=20 it vertical) and move it from side to side so that it touches first = one side=20 of the slot and then the other, the far end of the seal should move in = an arc=20 of no more than 3/16" of an inch - if it move more than that the slots = have=20 "V" passed specifications.
 
When you get the time, we all would like to = hear what=20 you 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=20 Dunlap
To: Rotary motors in = aircraft=20
Sent: Saturday, February 25, = 2006 6:48=20 PM
Subject: [FlyRotary] Rotor=20 identification

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

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