X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from zproxy.gmail.com ([64.233.162.204] verified) by logan.com (CommuniGate Pro SMTP 5.0c3) with ESMTP id 750133 for flyrotary@lancaironline.net; Tue, 04 Oct 2005 22:41:56 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.233.162.204; envelope-from=wdleonard@gmail.com Received: by zproxy.gmail.com with SMTP id p8so30229nzb for ; Tue, 04 Oct 2005 19:41:13 -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=rfFhLGIB3Bm26ASr619sfOfUSYDC75666bVZFp6MmL3PqtwYwaRt/m9501cT9mxmJ+466P9LfLaALluEJipCBqPQTQNOb135zfrRgxS2/a1CTiljGIkW8Ffu7uPZOij5YK3x9t2VbXPKo49w99pzGMozk/RzjNkUCJn2LMBT+xQ= Received: by 10.36.251.7 with SMTP id y7mr175789nzh; Tue, 04 Oct 2005 19:41:13 -0700 (PDT) Received: by 10.36.222.6 with HTTP; Tue, 4 Oct 2005 19:41:13 -0700 (PDT) Message-ID: <1c23473f0510041941j103b4785s9dd3fb53e2329849@mail.gmail.com> Date: Tue, 4 Oct 2005 19:41:13 -0700 From: David Leonard Reply-To: David Leonard To: Rotary motors in aircraft Subject: Re: [FlyRotary] counterweights In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_5531_16657230.1128480073104" References: ------=_Part_5531_16657230.1128480073104 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Thanks Ed, but that wont work. I only have 1 rear counter weight, and that came with the engine sold to m= e by Adkins (the other engine came with a flywheel). Turns out the rotors in that engine were 8.5:1 S4 turbo rotors when they were supposed to be the S5 turbo rotors. So I have absolutely no faith in what kind of counter weights he threw on there. There is one for sale on e-bay - but that guy does not know what year it came from either. hmmm To throw a wrench in the works, I was reading about the subject on the RX-= 7 forum, and one guy claims that has weighed the counter weights and finds that all engines from 86-95 have the same counter weights!! But I want to believe it because it would be easy. I know that Mazda has different part numbers but I suppose they could stil= l all be the same... Sigh..... And the worst part is that there was a pair of 9.7:1 rotors on e-bay a while back and I flaked and forgot to put in a bit... they went for $120 fo= r the pair, but new ones are $600 each - ouch! I'm taking a good hard look at trying to repair the 9.4 rotors that Ernest sent... Thanks for all the great stats to help me identify the rotors. The depth seems to match everything else I know about the rotors. Except: The depth of the chamber on the rotors from Atkins (10.2# with cast depression) is only (about) 7 mm. Do you think that the 8.5 rotors might have the same depth as the 9.0 (or 9.1) rotors? Dave On 10/4/05, Ed Anderson wrote: > > Dave, a though occurred to me. Since you do know the weight of the rotors > for each compression and year (see Mazdatirx chart below), if any one had > the counter weights for a know year, I imagine there is a proportional ra= tio > between rotor weight and counter weight. In other words, the lightest rot= ors > should take the lightest counter weights. Heaviest rotors the heaviest > counterweights. In fact if you had two data points for two different > compression rotors you could probably come close to figuring out the thir= d > counter weight weight. > Just a though. > Ed A > *Engine* *Year* *Compression* *Weight (Grams)* *Weight (Pounds)* *12A * > *76-82* *9.4* *4603* *10.15* *12A * *83-85* *9.4* *4353* *9.60* *13B* * > 74-78* *9.2* *5253* *11.58* *13B* *84-85* *9.4* *5253* *11.58* *13B N/T* = * > 86-88* *9.4* *4553* *10.04* *13B Turbo* *86-88* *8.5* *4553* *10.04* *13B > N/T* *89-92* *9.7* *4328* *9.54* *13B Turbo* *89-92* *9.0* *4328* *9.54* = *13B > T/T* *93-95* *9.0* *4328* *9.54* > Ed Anderson > Rv-6A N494BW Rotary Powered > Matthews, NC > eanderson@carolina.rr.com > -- 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_5531_16657230.1128480073104 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
Thanks Ed, but that wont work. 
 
I only have 1 rear counter weight, and that came with the engine = sold to me by Adkins (the other engine came with a flywheel).  Turns o= ut the rotors in that engine were 8.5:1 S4 turbo rotors when they were supp= osed to be the S5 turbo rotors.  So I have absolutely no faith in what= kind of counter weights he threw on there.  There is one for sale on = e-bay - but that guy does not know what year it came from either.  hmm= m
 
To throw a wrench in the works, I was reading about the subject on the= RX-7 forum, and one guy claims that has weighed the counter weights and fi= nds that all engines from 86-95 have the same counter weights!!  But I= want to believe it because it would be easy.
 
I know that Mazda has different part numbers but I suppose they could = still all be the same...
 
Sigh..... 
 
And the worst part is that there was a pair of 9.7:1 rotors on e-bay a= while back and I flaked and forgot to put in a bit...  they went for = $120 for the pair, but new ones are $600 each - ouch!
 
I'm taking a good hard look at trying to repair the 9.4 rotors that Er= nest sent...
 
Thanks for all the great stats to help me identify the rotors.  T= he depth seems to match everything else I know about the rotors.  Exce= pt:
 
The depth of the chamber on the rotors from Atkins (10.2#  with c= ast depression) is only (about) 7 mm.  Do you think that the= 8.5 rotors might have the same depth as the 9.0 (or 9.1) rotors?
 
Dave

 
On 10/4/05, = Ed Anderson <eanderson@= carolina.rr.com> wrote:
Dave, a though occurred to me.  Since you do= know the weight of the rotors for each compression and year (see Mazdatirx= chart below), if  any one had the counter weights for a know year, I = imagine there is a proportional ratio between rotor weight and counter weig= ht.  In other words, the lightest rotors should take the lightest coun= ter weights.  Heaviest rotors the heaviest counterweights.  In fa= ct if you had two data points for two different compression rotors you coul= d probably come close to figuring out the third counter weight weight.
 
Just a though.
 
Ed A
Engine Year Compression Weight (Grams) Weight (Pounds)
12A 76-82 9.4 4603 10.15
12A 83-85 9.4 4353 9.60
13B 74-78 9.2 5253 11.58
13B 84-85 9.4 5253 11.58
13B N/T 86-88 9.4 4553 10.04
13B Turbo 86-88 8.5 4553 10.04
13B N/T 89-92 9.7 4328 9.54
13B Turbo 89-92 9.0 4328 9.54
13B T/T 93-95 9.0 4328 9.54
 
 
Ed Anderson
Rv-6A N494BW Rotary Powered
Mat= thews, NC
eanderson@carolin= a.rr.com



-- 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 ------=_Part_5531_16657230.1128480073104--