X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from zproxy.gmail.com ([64.233.162.196] verified) by logan.com (CommuniGate Pro SMTP 5.0c3) with ESMTP id 751348 for flyrotary@lancaironline.net; Wed, 05 Oct 2005 23:45:58 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.233.162.196; envelope-from=wdleonard@gmail.com Received: by zproxy.gmail.com with SMTP id p8so171381nzb for ; Wed, 05 Oct 2005 20:45:14 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:references; b=OITRug4ZybTA2KQteycAoXXw2SGveDTsV8mjoD0S9fBLbcqxCfQC9E95NcZ6ZHPflg1KaNlqi4xgQG3wbwL1GSMxxakr9StGOS/jilvkkp9LDmcVYA1r56rZKWEvtjtLg8eXRxo6yOJ3crJnwLbf9R0A+GNXcZJ4DC5U5j97mUU= Received: by 10.36.220.25 with SMTP id s25mr63156nzg; Wed, 05 Oct 2005 20:45:14 -0700 (PDT) Received: by 10.36.222.6 with HTTP; Wed, 5 Oct 2005 20:45:14 -0700 (PDT) Message-ID: <1c23473f0510052045w63f4a37aqaf68ae56de66b133@mail.gmail.com> Date: Wed, 5 Oct 2005 20:45:14 -0700 From: David Leonard Reply-To: David Leonard To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Counterweight for engine assy, 13Brewtt In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_10554_6958419.1128570314672" References: ------=_Part_10554_6958419.1128570314672 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On 10/5/05, cardmarc@charter.net wrote: > > Here's an even better one. I have a 93/94 engine. I have two > counterweights I could use for this engine. They differ by 2 oz. (one has > two holes drilled on the counterweight flange, the other 2, so it WAS > balanced once for a particular engine assy). Which should I use, or do I > need to get a dynamic balance of the assy after I clean up the rotors? Wh= o > does that-I saw a write up of balancing the assy.....? Is there an easy w= ay > I can determine which is best? > Marc Wiese > > Marc, I think you have hit the nail on the head.. the dynamic balance is the way to go. The difference between s4,5,6 does not seem to matter so much as the difference between individual rotors. It seems that in practice, from what I gather, that very few actually bother with dynamic balance. And in reality, it probably does not matter except for some smoothness unless you are approaching 10k rpm. So, my NEXT engine will have dynamic balance.... :-) no time right now.. I need to fly. -- 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 ------=_Part_10554_6958419.1128570314672 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline

On 10/5/05, = cardmarc@charter.net <cardmarc@charter.net> wrote:
Here's an even better one. I hav= e a 93/94 engine. I have two counterweights I could use for this engine. Th= ey differ by 2 oz. (one has two holes drilled on the counterweight flange, = the other 2, so it WAS balanced once for a particular engine assy). Which s= hould I use, or do I need to get a dynamic balance of the assy after I clea= n up the rotors? Who does that-I saw a write up of balancing the assy.....?= Is there an easy way I can determine which is best?
Marc Wiese
>
 
Marc,
 
I think you have hit the nail on the head..   the dynamic ba= lance is the way to go.  The difference between s4,5,6 does not s= eem to matter so much as the difference between individual rotors. 
 
It seems that in practice, from what I gather, that very few actually = bother with dynamic balance.  And in reality, it probably does not mat= ter except for some smoothness unless you are approaching 10k rpm. 
 
So, my NEXT engine will have dynamic balance....  :-)  no ti= me right now.. I need to fly.
------=_Part_10554_6958419.1128570314672--