Return-Path: Received: from mail13.syd.optusnet.com.au ([211.29.132.194] verified) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP-TLS id 880552 for flyrotary@lancaironline.net; Sat, 16 Apr 2005 20:58:56 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.194; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-63-248.dsl.nsw.optusnet.com.au [220.236.63.248]) by mail13.syd.optusnet.com.au (8.12.11/8.12.11) with SMTP id j3H0w5Um006139 for ; Sun, 17 Apr 2005 10:58:07 +1000 Message-ID: <002c01c542e9$0ae39f70$f83fecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: New rotors, New housings Date: Sun, 17 Apr 2005 11:01:51 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0029_01C5433C.DBBCCF10" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 This is a multi-part message in MIME format. ------=_NextPart_000_0029_01C5433C.DBBCCF10 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable [FlyRotary] Re: New rotors, New housings Ken, Is that all off the one side - that much off each side - or half off = each side !? George ( down under) I wouldn't think about putting an engine together without shaving the = rotors, I cut 15 thousandths of an inch at the tip and tapper it off to = zero where the blueing is. I have thought about running a RX-8 engine but I don't think the = high compression would work well with the 100 hp increase of nitrous I = require to lift a heavy load out of the water. Ken Ed, Ken's comments reminds me to say that I remeasured the width of the = RX8 rotor for a more accurate measurement and it appears after a number = of measurements that the RX8 rotor are only slightly wider, this being = .04mm in the gear area and only .02mm at the apex. This I believe won't be a problem at the RPM and power settings we = generally use. However it would represent a small problem in Ken's = application as he uses NOS at take-off and at that high power the = E-shaft does flex a little - this causes the rotors to skew slightly, = binding at the apex areas. Ken already has this problem with the RX7 = rotors and skims them to eliminate this problem. This is a remedy that = many in the racing game use as well. I don't believe there's a problem with the single rotor application = and won't be skimming the rotor.=20 Hope that helps! George ( down under) I would look into getting 85-85 GSELE rotors with the 3 mm = seals, you would also need the weights to match them, then machine out = your rotors for a spare engine, you may need one to bale you out in the = future, if you keep this up you may knock me off the seat as president = of the dead stick club. I am now running rotors machined out to 3 mm seals and at about = 400 hrs on them I can tell by checking through the exhaust port that the = seal grooves are getting V'ed out and getting sloppy so I am now putting = another engine together, on this one the rotors are in prime shape so I = think I will run Tracy's 2mm seals. Also I think that the groves may be hardened and by machining the = groves out makes them softer as they shouldn't have worn out in only 400 = hrs. Ken Well, the decision has been made. Thanks in part to the wife's = continued interest in my warm body on cold winter nights, the decision = has been made to purchase new rotors and rotor housings. $$ but = apparently I am worth it {:>) I looked into milling out the slots to 3mm and that would have = been the cheaper approach - but cheap approach is probably partly = responsible for me being in this situation - so going to try a different = approach this time. Besides leery of using a rotor which clearly has = been subjected to sufficient loads to scrape metal off its surface and = peen over apex slot. In the process of getting quotes. Ed Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com -------------------------------------------------------------------------= ----- >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0029_01C5433C.DBBCCF10 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable [FlyRotary] Re: New rotors, New housings
 
Ken,
Is that all off the one side - that much off = each side=20 - or half off each side !?
George ( down under)
 
I wouldn't think about putting an engine = together=20 without shaving the rotors, I cut 15 thousandths of an inch at the tip = and=20 tapper it off to zero where the blueing is.
  I have thought about running a RX-8 = engine but=20 I don't think the high compression would work well with the 100 hp = increase of=20 nitrous I require to lift a heavy load out of the water.
  Ken



Ed,
Ken's = comments=20 reminds me to say that I remeasured the width of the RX8 rotor for a = more=20 accurate measurement and it appears after a number of measurements = that the=20 RX8 rotor are only slightly wider, this being .04mm in the gear area = and=20 only .02mm at the apex.
 
This = I believe=20 won't be a problem at the RPM and power settings we generally use. = However=20 it would represent a small problem in Ken's application as he = uses NOS=20 at take-off and at that high power the E-shaft does flex a little - = this=20 causes the rotors to skew slightly, binding at the apex areas. Ken = already=20 has this problem with the RX7 rotors and skims them to = eliminate=20 this problem. This is a remedy that many in the racing game use as=20 well.
 
 I don't=20 believe there's a problem with the single rotor application and = won't be=20 skimming the rotor. 
 
Hope = that=20 helps!
George ( down=20 under)
  I would look into getting 85-85 GSELE rotors with = the 3=20 mm seals, you would also need the weights to match them, then = machine out=20 your rotors for a spare engine, you may need one to bale you out = in the=20 future, if you keep this up you may knock me off the seat as = president of=20 the dead stick club.
  I am now running rotors machined out to 3 mm = seals and=20 at about 400 hrs on them I can tell by checking through the = exhaust port=20 that the seal grooves are getting V'ed out and getting sloppy so I = am now=20 putting another engine together, on this one the rotors are in = prime shape=20 so I think I will run Tracy's 2mm seals.
 Also I think that the groves may be hardened and = by=20 machining the groves out makes them softer as they shouldn't have = worn out=20 in only 400 hrs.
  Ken



Well, the=20 decision has been made.  Thanks in part to the wife's = continued=20 interest in my warm body on  cold winter nights, the = decision has=20 been made to purchase new rotors and rotor housings.  $$ = but=20 apparently I am worth it = {:>)

 
I looked into milling out = the slots=20 to 3mm and that would have been the cheaper approach - but cheap = approach is probably partly responsible for me being in this = situation -=20 so going to try a different approach this time.  Besides = leery of=20 using a rotor which clearly has been subjected to sufficient = loads to=20 scrape metal off its surface and peen over apex=20 slot.

 
In the process of getting = quotes.

 
Ed

 
Ed Anderson
Rv-6A = N494BW Rotary=20 Powered
Matthews, NC
eanderson@carolina.rr.com
<= /BLOCKQUOTE>

>>  Homepage: =20 http://www.flyrotary.com/
>>  Archive:  =20 = http://lancaironline.net/lists/flyrotary/List.html
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