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 5.0c3) with ESMTP id 749769 for flyrotary@lancaironline.net; Tue, 04 Oct 2005 21:50:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id j951oBl9003482 for ; Tue, 4 Oct 2005 21:50:12 -0400 (EDT) Message-ID: <000d01c5c94e$ef9468c0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Telling rotors apart - Never trust Atkins! Date: Tue, 4 Oct 2005 21:48:50 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000A_01C5C92D.68343390" 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_000A_01C5C92D.68343390 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thanks, Bob Saves me a trip to the workshop and trying to find the note book in my = orderly and neat work shop. Yes, that was pretty close to what I = recalled from memory. Dave, I never took any measurements of counterweights, so can not really = help you there.=20 ----- Original Message -----=20 From: Bob Perkinson=20 To: Rotary motors in aircraft=20 Sent: Tuesday, October 04, 2005 9:32 PM Subject: [FlyRotary] Re: Telling rotors apart - Never trust Atkins! Ok, Georges, found my notes. for the 9.7:1 the depth is 4mm. 9.4:1 = is 5.5mm and the 9.1 is 7 mm. Ed OK Ed, I found this in my archives. Bob Perkinson Hendersonville, TN. RV9 N658RP Reserved If nothing changes Nothing changes =20 -----Original Message----- From: Rotary motors in aircraft = [mailto:flyrotary@lancaironline.net]On Behalf Of David Leonard Sent: Tuesday, October 04, 2005 8:03 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Telling rotors apart - Never trust Atkins! Ed, you are the best. While you are there see if that magic book = can distinguish between the different front and rear count-weights. Thanks! --=20 Dave Leonard Turbo Rotary RV-6 N4VY http://members.aol.com/_ht_a/rotaryroster/index.html http://members.aol.com/_ht_a/vp4skydoc/index.html=20 =20 On 10/4/05, Ed Anderson wrote:=20 Dave, I am going to have to dig through my note book out in the = workshop. But,if memory serves me correct, the 9.7:1 measures 4mm from = the bottom of a straight edge across the face (long way) at its deepest = part of the compression cavity.=20 Again, I will check my note book and get back to you but I think = the 9.4:1 measured around 5- 5 1/2 mm and the 9.1:1 measured at 7mm. Ed A ----- Original Message -----=20 From: David Leonard=20 To: Rotary motors in aircraft=20 Sent: Tuesday, October 04, 2005 7:21 PM Subject: [FlyRotary] Telling rotors apart - Never trust Atkins! =20 On 9/28/05, Kelly Troyer wrote:=20 Ed Anderson has a measurement to check the depth of the = combustion depression in the face of the rotor to determine the compression ratio (the = deeper one is turbo)....... How about it Ed, any info on this? Can it be used to tell the = 9.4:1 86-88 rotors from the 9.7:1 rotors? Bottom line check weight first then check the depth of the = combustion depression........I have another way I use to determine what year my rotors are (all my = engines are NA 86 to 91).....The combustion depression in the 86 to 88 is as cast in the rotor = (slight grainy surface finish).....The 89-91 depression is machined and has straight machine = marks....... That is really interesting. My old rotors are supposed to be = 1991 T2 rotors but they have the cast appearance (However since I got = them from Atkins I am not really sure they gave me what they sold me). = The rotors that Earnest sent also have a cast appearance. But as I = recall, the rotors in the engine I rebuilt had the milling marks... = hmmm.. if that is true the balance in my current engine is all SNAFU. = Are you sure that system is a valid way to do the measuring?=20 So I just got back from weighing my rotors - Sure enough, the = ones Atkins sold me weighted in at 10.20 and 10.19 making them the 86-88 = variety despite the fact that I paid for a '91 engine. Worse, I have no = idea what counter-weights he decided to use. If it matched the rotors = he sold me then I have been running an unbalanced engine for the last = 150 hrs. (that explains part of why the wife won't fly in it)=20 Does anyone know what the correct weights of the counter weights = should be for a given year group? Or perhaps some other way of telling = them apart? BTW Ernest, the rotors you sent also weigh in at 10.18. Dave Leonard ------=_NextPart_000_000A_01C5C92D.68343390 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
  Thanks, Bob
 
Saves me a trip to the workshop and trying to = find the=20 note book in my orderly and neat work shop.  Yes, that was pretty = close to=20 what I recalled from memory.
 
Dave, I never took any measurements of = counterweights, so=20 can not really help you there.
----- Original Message -----
From:=20 Bob=20 Perkinson
Sent: Tuesday, October 04, 2005 = 9:32=20 PM
Subject: [FlyRotary] Re: = Telling rotors=20 apart - Never trust Atkins!

 
 
Ok, Georges, found my notes.  for the 9.7:1 the depth is = 4mm. =20 9.4:1  is 5.5mm and the 9.1 is 7 mm.
 
Ed
 
OK Ed, I=20 found this in my archives.

Bob Perkinson
Hendersonville, TN.
RV9 N658RP=20 Reserved
If nothing changes
Nothing = changes
 

-----Original Message-----
From: Rotary motors in = aircraft=20 [mailto:flyrotary@lancaironline.net]On Behalf Of David=20 Leonard
Sent: Tuesday, October 04, 2005 8:03 = PM
To:=20 Rotary motors in aircraft
Subject: [FlyRotary] Re: Telling = rotors=20 apart - Never trust Atkins!

Ed, you are the best.  While you are there see if that = magic book=20 can distinguish between the different front and rear = count-weights.
 
Thanks!

--
Dave Leonard
Turbo Rotary RV-6 = N4VY
http://memb= ers.aol.com/_ht_a/rotaryroster/index.html
http://members= .aol.com/_ht_a/vp4skydoc/index.html=20
 
On 10/4/05, Ed=20 Anderson <eanderson@carolina.rr.com&g= t;=20 wrote:=20
Dave, I am going to have to dig through my = note book=20 out in the workshop.  But,if memory serves me correct, the = 9.7:1=20 measures 4mm from the bottom of a straight edge across the face = (long way)=20 at its deepest part of the compression cavity.
 
Again, I will check my note book and get = back to you=20 but I think the 9.4:1 measured around 5- 5 1/2 mm and the 9.1:1 = measured=20 at 7mm.
 
Ed A
----- Original Message ----- =
From: David = Leonard
To: Rotary motors in=20 aircraft
Sent: Tuesday, October = 04, 2005=20 7:21 PM
Subject: [FlyRotary] = Telling rotors=20 apart - Never trust Atkins!

 

On 9/28/05, Kelly=20 Troyer <keltro@att.net> wrote:=20
 
  Ed Anderson has a measurement to check the depth = of the=20 combustion depression in the
face of the rotor to determine the compression ratio (the = deeper=20 one is turbo).......
 
How about it Ed, any info on this?  Can it be used to = tell the=20 9.4:1 86-88 rotors from the 9.7:1  rotors?

 Bottom line check weight first then check the depth = of the=20 combustion depression........I have
another way I use to determine what year my rotors are = (all my=20 engines are NA 86 to 91).....The
combustion depression in the 86 to 88 is as cast in the = rotor=20 (slight grainy surface finish).....The
89-91 depression is machined and has straight machine=20 marks.......
 
That is really interesting.  My old rotors are = supposed to be=20 1991 T2 rotors but they have the cast appearance (However since = I got=20 them from Atkins I am not really sure they gave me what they = sold=20 me).  The rotors that Earnest sent also have a cast=20 appearance.  But as I recall, the rotors in the engine I = rebuilt=20 had the milling marks...   hmmm..  if that is = true the=20 balance in my current engine is all SNAFU.  Are you sure = that=20 system is a valid way to do the measuring?
 
So I just got back from weighing my rotors - Sure enough, = the ones=20 Atkins sold me weighted in at 10.20 and 10.19 making them the = 86-88=20 variety despite the fact that I paid for a '91 engine.  = Worse, I=20 have no idea what counter-weights he decided to use.  If it = matched=20 the rotors he sold me then I have been running an unbalanced = engine for=20 the last 150 hrs.  (that explains part of why the wife = won't fly in=20 it)
 
Does anyone know what the correct weights of the counter = weights=20 should be for a given year group?  Or perhaps some other = way of=20 telling them apart?
 
BTW Ernest, the rotors you sent also weigh in at = 10.18.
 
Dave Leonard

 
------=_NextPart_000_000A_01C5C92D.68343390--