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X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from S2.cableone.net ([24.116.0.228] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 998389 for flyrotary@lancaironline.net; Sat, 25 Feb 2006 22:24:31 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.116.0.228; envelope-from=crayd@cableone.net Received: from chuckathlon (unverified [69.92.218.28]) by S2.cableone.net (CableOne SMTP Service S2) with ESMTP id 46849480 for ; Sat, 25 Feb 2006 21:03:57 -0700 Return-Path: From: "Chuck Dunlap" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Rotor identification Date: Sat, 25 Feb 2006 20:23:36 -0700 Message-ID: <000f01c63a84$081e85f0$6501a8c0@chuckathlon> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0010_01C63A49.5BBFADF0" 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 2, First 21, 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_0010_01C63A49.5BBFADF0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy Sent: Saturday, February 25, 2006 6:09 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: 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 =20 Hi Chuck, =20 As you probably know, the rotors you use must also match the counterweights that you have. What year, and CR rotors do you have in the current engine? =20 Overall weight of the rotors will tell the tale for counterweights, and will also narrow down the CR identification to only two choices per rotor weight. Attached is the weight and CR chart that I "borrowed" from Mazdatrix's site. =20 =20 Do you have the old engine at home, or are you planning to build a new engine, then swap them in one trip? =20 =20 Good luck. =20 =20 Rusty (8 days RV-8 construction, finishing empennage kit tomorrow) =20 =20 Thanks for reminding of that, Rusty - I was thinking of using the high compression rotors but I will have to wait until I can find the late model counterweights to match, I will use the low compression ones instead. I have had two motors, both are 1986 series 4 with the 9.4 CR rotors. I plan to build up one motor out of the good parts that I have, and drive it to Texas and swap it out on site. I will hopefully fly the RV6 back, and my brother will drive the truck back with the bad motor. I have swapped motors enough times that I think I can easily do it in one day. Chuck ------=_NextPart_000_0010_01C63A49.5BBFADF0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

-----Original Message-----
From: = Rotary motors in=20 aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of = Russell=20 Duffy
Sent: Saturday, February 25, 2006 6:09 = PM
To: Rotary=20 motors in aircraft
Subject: [FlyRotary] Re: Rotor=20 identification

I bought=20 this pair of used rotors to build up a new motor so I can retrieve my = RV-6.=20 They look 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.

Hi Chuck,

As you = probably know, the=20 rotors you use must also match the counterweights that you have. = What=20 year, and CR rotors do you have in the current=20 engine?

Overall = weight of the=20 rotors will tell the tale for counterweights, and will also narrow = down the CR=20 identification to only two choices per rotor = weight.  Attached=20 is the weight and CR chart that I "borrowed" from Mazdatrix's=20 site.

Do you have = the old engine=20 at home, or are you planning to build a new engine, then swap them in = one=20 trip?

Good=20 luck.

Rusty (8 = days=20 RV-8 construction, finishing empennage kit tomorrow)

&nbs= p;

Thanks for = reminding of=20 that, Rusty - I was thinking of using the high compression rotors but = I will=20 have to wait until I can find the late model counterweights to match, = I will=20 use the low compression ones instead. I have had two motors, both = are=20 1986 series 4 with the 9.4 CR rotors. I plan to build up one motor out = of the=20 good parts that I have, and drive it to Texas and swap it out on = site. I=20 will hopefully fly the RV6 back, and my brother will drive the truck = back with=20 the bad motor. I have swapped motors enough times that I think I can = easily do=20 it in one day.

Chuck

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