X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-01.southeast.rr.com ([24.25.9.100] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2131562 for flyrotary@lancaironline.net; Thu, 21 Jun 2007 09:58:18 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-103-061.carolina.res.rr.com [24.74.103.61]) by ms-smtp-01.southeast.rr.com (8.13.6/8.13.6) with SMTP id l5LDvHJg013064 for ; Thu, 21 Jun 2007 09:57:17 -0400 (EDT) Message-ID: <002401c7b40c$20eb0970$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Proseal was Re: [FlyRotary] Re: PP construction methods Date: Thu, 21 Jun 2007 09:57:38 -0400 MIME-Version: 1.0 Content-Type: text/plain; format=flowed; charset="iso-8859-1"; reply-type=response Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3028 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 X-Virus-Scanned: Symantec AntiVirus Scan Engine That Polysulfide is remarkable stuff. When I started to put together the two parts of an 2 1/4" instrument case, the 3/8" thick flange and the 2.25" tube, I scratched my head over how to join the two. Set screws were simply too labor intensive, crazy glue was too brittle - but, I had some "tank sealer" left over (years on the shelf) which I mixed a small amount together, smeared a thin amount on the inside of the flange and pushed the tube in. Once it set I could not get the tube out of the flange without destroying the aluminum tube. Really sticks and doesn't turn brittle. Ed ----- Original Message ----- From: "Tracy crook" To: "Rotary motors in aircraft" Sent: Thursday, June 21, 2007 9:31 AM Subject: [FlyRotary] Re: PP construction methods >I don't intend to build a PP engine anytime soon but FWIW, I think the >best possible material for bonding and sealing the insert is Proseal >(Polysulfide stuff used to seal fuel tanks). It is amazing stuff and I >use it whenever it absolutely, positively has to seal and bond the first >time. Not cheap and it has a short shelf life but worth it when failure >could mean the loss of a $400 rousing (or worse). Use an appropriate >viscosity (it is made in various ones) and it's my guess that welding, >O-rings, epoxy, etc would be unnecessary. > > Tracy > > What is Wildblue? Wildblue is my satelite internet provider that freed > me from dial-up hell where DSL is not available. > >> >>George, >> Let me get this straight.........Steel tube TIG welded to steel >> insert.......Then aluminum >>insert with O-ring (s) to seal to the steel tube.......? A sketch would be >>worth a thousand >>words for the engineering challenged........ >>-- >>Kelly Troyer >>"Dyke Delta"_13B ROTARY Engine >>"RWS"_RD1C/EC2/EM2 >>"Mistral"_Backplate/Oil Manifold >> >> >> >> >> >> >>-------------- Original message from "George Lendich" >>: -------------- >> >> >>Rusty, >>I Heard similar stories, but am sure Lynn is correct in that, if their >>done correctly their OK. The one's I seen weren't so good. >>The new method of welding to the steel liner, eliminates any possible >>leak. I originally suggested welding to the inner and outer aluminium, but >>someone suggested that wasn't feasible, as it was too difficult to get >>access to. >>So Tig welding to the steel liner is good but you have to use a steel >>tube - which you can't weld externally. So I came up with a method of Tig >>welding a aluminium tube and flange to the exterior, which has an O ring >>seal to the steel tube, and passed it by Bill J. who felt it was a good >>idea. Probably could use a couple of O rings if you felt like it. The >>advantage of this is that the O ring will allow for differing expansion >>and contraction rates which might put stress on the inner tig welding. Am >>elegant solution IMHO. >>On the side ports, your suggestion would be OK. >>Of course the factory PP were integral to the injection casting. >>George ( down under) >> >> >>Greetings, >> >>One of the things that's always bothered me about making a PP housing is >>leakage. I've heard very experienced folks say that eventually, any PP >>housing you make will leak, and it's easy for me to imagine that >>happening. I don't think I've heard the same thing about factory housings >>though. How are the ports installed in the factory PP housing? >> >>The other problem with a conversion is the side ports. I know people fill >>these with their favorite epoxy, but I'd worry about that coming loose, >>and getting into the rotor. How much would it hurt the PP operation if >>you just sealed the ports on the outside of the side housings with a plate >>where the intake would have been? >> >>Cheers, >>Rusty > > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html