Return-Path: Received: from imf25aec.mail.bellsouth.net ([205.152.59.73] verified) by logan.com (CommuniGate Pro SMTP 4.2.8) with ESMTP id 602881 for flyrotary@lancaironline.net; Mon, 10 Jan 2005 21:21:34 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.73; envelope-from=sqpilot@bellsouth.net Received: from [209.214.44.167] by imf25aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050111022106.KMS2518.imf25aec.mail.bellsouth.net@[209.214.44.167]> for ; Mon, 10 Jan 2005 21:21:06 -0500 Received: from 127.0.0.1 (AVG SMTP 7.0.300 [265.6.9]); Mon, 10 Jan 2005 20:20:53 -0600 From: "Paul" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Balanced Assemblies was Re: [FlyRotary] 9.7 rotors Date: Mon, 10 Jan 2005 20:20:33 -0600 Message-ID: <000001c4f784$24650340$a72cd6d1@paul52u7f5qyav> X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2616 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=======AVGMAIL-41E3380548BD=======" --=======AVGMAIL-41E3380548BD======= Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4F751.D9CCDD30" ------=_NextPart_000_0001_01C4F751.D9CCDD30 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Thanks so much for the info, Leon..There's a lot to learn about these rotaries. Paul Conner -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Leon Sent: Monday, January 10, 2005 4:34 PM To: Rotary motors in aircraft Subject: [FlyRotary] Balanced Assemblies was Re: [FlyRotary] 9.7 rotors Hi Paul, The 9.7:1 rotors are considerably lighter than the 9.4:1 units. If you are going to use 9.7:1 units, then the best option is to just get the whole rotating mass re-balanced. You can use the eccentric shaft and both the counterweights you already have. It is always better to start with counterweights that are too heavy, rather than try to add weight to too light counterweights The Balancier will first dynamically balance the lighter rotor of the pair, and match balance both rotors to the same weight. Then balance the whole rotating assy by just removing material from the counterweights by drilling/grinding to get the balance cortrect. This will give you a superbly smooth motor. . WARNING: If you try swapping counterweights, it's fraught with pitfalls, and you never really know you have the correct counterweights until you run the engine (unless the assy has been scrupulously kept together - the older shafts used to have correspondence numbers stamped on the so you could tell if they had been swapped). You will need both the front & rear Series V '89 -91 counter weights, which don't have any distinguishing part #s or identification marks on them. A nightmare even if you are experienced. Re-balancing is ALWAYS the best option. What it costs you to have the whole assembly dynamically balanced, you will save some if not all by NOT buying or scrounging additional counter weights. Additionally, you are guaranteed to have a perfectly smooth engine. One has to experience a really good balance job to appreciate just how smooth Mr Wankel's Wonderful Whirrler is! Factory motors, while usually pretty good balance-wise, are balanced to a tolerance, and are often not as smooth as they can be. Like I said, you have to have experienced it to understand!! Take the time and the extra bux to do it once and do it RIGHT! Cheers, Leon ----- Original Message ----- From: Paul To: Rotary motors in aircraft Sent: Tuesday, January 11, 2005 3:47 AM Subject: [FlyRotary] 9.7 rotors Hi, fellow rotorary enthusiasts....I need to ask the group a question. I now have a street ported 4 port turbo engine, into which I was going to put my 9.4 NA rotors and rotor housings. If I pick up a set of 9.7 rotors, do I have to change anything else, ie concentric shaft counterweight, etc, or can I just swap rotors? I have read that you need the correct balance counterweight, but I assumed that is to balance the concentric shaft, not the rotors? If I can just swap out rotors, and it would have no effect on balance or anything else, I would go ahead with the swap. Thanks in advance for all your replies. Paul Conner _____ No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.6.9 - Release Date: 1/6/2005 _____ >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0001_01C4F751.D9CCDD30 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: quoted-printable

Thanks so much for the info, = Leon….There’s a lot to learn about these = rotaries.  Paul = Conner

 

-----Original = Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Leon
Sent: Monday, January 10, = 2005 4:34 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] = Balanced Assemblies was Re: [FlyRotary] 9.7 rotors

 

Hi = Paul,

 

The 9.7:1 rotors are = considerably lighter than the 9.4:1 units.  If you are going to use 9.7:1 = units,  then the best option is to just get the whole rotating mass = re-balanced.  You can use the eccentric shaft and both the counterweights you already have. It is always better to start with counterweights that are too heavy,  rather than try to add weight to too light = counterweights

 

The Balancier will first = dynamically balance the lighter rotor of the pair,  and match balance both = rotors to the same weight.  Then balance the whole rotating assy = by just removing material from the counterweights by drilling/grinding to get = the balance cortrect. This will give you a superbly smooth motor.  = .

 

WARNING:  If you try = swapping counterweights, it's fraught with pitfalls,  and you never = really know you have the correct counterweights until you run the engine = (unless the assy has been scrupulously kept together - the older shafts used to have correspondence numbers stamped on the so you could tell if they had = been swapped).  You will need both the front & rear Series = V '89 -91 counter weights,  which don't have any distinguishing part #s = or identification marks on them.  A nightmare even if you are = experienced.

 

Re-balancing is ALWAYS the = best option.  What it costs you to have the whole assembly dynamically balanced,  you will save some if not all by NOT buying or = scrounging additional counter weights.  Additionally,  you are guaranteed = to have a perfectly smooth engine.  One has to experience a really = good balance job to appreciate just how smooth Mr Wankel's Wonderful Whirrler is!  Factory motors,  while usually pretty good balance-wise,  are balanced to a tolerance,  and are often not = as smooth as they can be.  Like I said,  you have to have = experienced it to understand!!  Take the time and the extra bux to do it once and = do it RIGHT!

 

Cheers,

 

Leon

 

----- Original Message = -----

From: Paul

Sent: Tuesday, January 11, 2005 3:47 AM

Subject: [FlyRotary] 9.7 rotors

 

Hi, fellow rotorary = enthusiasts....I need to ask the group a question.  I now have a street ported 4 = port turbo engine, into which I was going to put my 9.4 NA rotors and rotor housings.  If I pick up a set of 9.7 rotors, do I have to change = anything else, ie concentric shaft counterweight, etc, or can I just swap rotors?  I have read that you need the correct balance counterweight, but I assumed that is to balance the concentric shaft, not the rotors?  = If I can just swap out rotors, and it would have no effect on balance or anything = else, I would go ahead with the swap.  Thanks in advance for all your = replies. Paul Conner

No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.300 / Virus Database: 265.6.9 - Release Date: = 1/6/2005

>>  Homepage:  http://www.flyrotary.com/
>>  Archive:   = http://lancaironline.net/lists/flyrotary/List.html

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