X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail13.syd.optusnet.com.au ([211.29.132.194] verified) by logan.com (CommuniGate Pro SMTP 5.2.0) with ESMTPS id 2720455 for flyrotary@lancaironline.net; Fri, 08 Feb 2008 00:37:13 -0500 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.194; envelope-from=lendich@optusnet.com.au Received: from george (d58-108-109-166.dsl.nsw.optusnet.com.au [58.108.109.166]) by mail13.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id m185aN43009834 for ; Fri, 8 Feb 2008 16:36:24 +1100 Message-ID: <002401c86a14$8b9754e0$a66d6c3a@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Rotor Weight Codes Date: Fri, 8 Feb 2008 15:36:23 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0021_01C86A68.5C0FEDF0" 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-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_0021_01C86A68.5C0FEDF0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Kelly, TIA George (down under) George and All, Perhaps could be helpful info to know weight variance of rotors = of all the different weight codes.........I do not have scales sensitive = enough to tell the difference but perhaps the post office, UPS, etc scales would do = it....... As time permits I will put that on my short list !!........... -- Kelly Troyer=20 "Dyke Delta"_13B ROTARY Engine=20 "RWS"_RD1C/EC2/EM2=20 "Mistral"_Backplate/Oil Manifold=20 -------------- Original message from "George Lendich" = : --------------=20 Kelly, Yep! your right, I was referring to the matching code. I mentioned = this in case anyone would take rotors from different sources, however if = they came from the same engine their likely to be matched. I don't know how the counter weight is matched, I have seen and = heard of rebuilds that do all sorts of things and even balancing which = is not as good as factory balancing. I believe it's to do with what's ( = what weights)allowed for in the physically balancing. For those uneducated in the physical balancing process, the e-shaft = is spun up with dummy weights (bolted onto the e-shaft lobes) that = represent the weight of the rotor, all seal weights ( except apex seal = and spring) and the oil in the rotor. The counter weights are then = adjusted for best balance. Adjusting involves adding or removing metal = from the counter weights. I don't believe static balancing is accurate = enough fro a 2 rotor ( because of the rocking couple) but might be good = enough for the single rotor. I believe that's what Richard Sohn has done = to date for his single development. I think if we take parts from other engines ( as I am doing ) it = would be advantageous to know the variance of the code system. I believe = someone was working to identify what the difference in code represented = in weight - but no final outcome to my knowledge. If we could also nail = down the weight of the corresponding counter weight it would solve a lot = of problems for experimental builders. Instead of matching things we = could just weigh them. Is there any information you can give on different weights from your = 3 sets? George ( down under) George, I presume you are making reference to the letter (A,B,C,D) = weight code for rotors........Engines that have not been opened (stock) will have = matched weight rotors within one letter of each other (that is = AA-AB-BB-BC-CC-CD-DD)...... I have not heard of such a weight code for the counterweights = but I stand to be educated if there is one.......I have managed to collect 3 sets = of 89-91 rotors (9.7 to 1) with matching weight codes.........FWIW -- Kelly Troyer=20 "Dyke Delta"_13B ROTARY Engine=20 "RWS"_RD1C/EC2/EM2=20 "Mistral"_Backplate/Oil Manifold=20 -------------- Original message from "George Lendich" = : --------------=20 Kelly and All, Even when the weight of the rotors and the counter weight are = confirmed as being compatible - one should also remember the lettering = stamping system which matches a paired set, for balancing through = similar weight. I have never been able to confirm what the difference in = weight is exactly, which is a shame. George ( down under) -------------------------------------------------------------------------= ----- No virus found in this incoming message. Checked by AVG Free Edition.=20 Version: 7.5.516 / Virus Database: 269.19.21/1263 - Release Date: = 6/02/2008 8:14 PM ------=_NextPart_000_0021_01C86A68.5C0FEDF0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Kelly,
TIA
George (down under)
George and All,
       Perhaps could be helpful = info to=20 know weight variance of rotors of all
the different weight codes.........I do not have scales sensitive = enough=20 to tell
the difference but perhaps the post office, UPS, etc scales would = do=20 it.......
      As time permits I will put that on = my=20 short list !!...........
--
Kelly Troyer
"Dyke = Delta"_13B=20 ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil = Manifold=20




--------------=20 Original message from "George Lendich" = <lendich@optusnet.com.au>:=20 --------------

Kelly,
Yep! your right, I was referring to = the=20 matching code. I mentioned this in case anyone would take rotors = from=20 different sources, however if they came from the same engine their = likely to=20 be matched.
 
I don't know how the counter weight = is matched,=20 I have seen and heard of rebuilds that do all sorts of things and = even=20 balancing which is not as good as factory balancing. I believe it's = to do=20 with what's ( what weights)allowed for in the physically=20 balancing.
 
For those uneducated in the = physical balancing=20 process, the e-shaft is spun up with dummy weights (bolted onto = the=20 e-shaft lobes) that represent the weight of the rotor, all seal = weights=20 ( except apex seal and spring) and the oil in the rotor. The counter = weights=20 are then adjusted for best balance. Adjusting involves adding or = removing=20 metal from the counter weights. I don't believe static balancing is = accurate=20 enough fro a 2 rotor ( because of the rocking couple) but might be = good=20 enough for the single rotor. I believe that's what Richard Sohn has = done to=20 date for his single development.
 
I think if we take parts from other = engines (=20 as I am doing ) it would be advantageous to know the variance of the = code=20 system. I believe someone was working to identify what the = difference in=20 code represented in weight - but no final outcome to my knowledge. = If we=20 could also nail down the weight of the corresponding counter weight = it would=20 solve a lot of problems for experimental builders. Instead of = matching=20 things we could just weigh them.
 
Is there any information you can = give on=20 different weights from your 3 sets?
 
George ( down under)
George,
    I presume you are making reference to the = letter=20 (A,B,C,D) weight code for
rotors........Engines that have not been opened (stock) will = have=20 matched weight
rotors within one letter of each other (that is=20 AA-AB-BB-BC-CC-CD-DD)......
  I have not heard of such a weight code for the = counterweights=20 but I stand to
be educated if there is one.......I have managed to = collect 3=20 sets of 89-91 rotors
(9.7 to 1) with matching weight codes.........FWIW
--
Kelly Troyer
"Dyke = Delta"_13B=20 ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil = Manifold=20




--------------=20 Original message from "George Lendich" = <lendich@optusnet.com.au>:=20 --------------

Kelly and All,
Even when the weight of the = rotors and the=20 counter weight are confirmed as being compatible - one should = also=20 remember the lettering stamping system which matches a = paired set,=20 for balancing through similar weight. I have never been able to = confirm=20 what the difference in weight is exactly, which is a = shame.
George ( down = under)
 
 
 
 

No virus found in this incoming message.
Checked by AVG Free = Edition.
Version: 7.5.516 / Virus Database: 269.19.21/1263 - = Release Date:=20 6/02/2008 8:14 PM
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