X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail34.syd.optusnet.com.au ([211.29.133.218] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTPS id 2130951 for flyrotary@lancaironline.net; Thu, 21 Jun 2007 03:12:27 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.133.218; envelope-from=lendich@optusnet.com.au Received: from george (d220-236-151-121.dsl.nsw.optusnet.com.au [220.236.151.121]) by mail34.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l5L7BccH009840 for ; Thu, 21 Jun 2007 17:11:40 +1000 Message-ID: <001801c7b3d3$6c56fce0$7997ecdc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: PP construction methods Date: Thu, 21 Jun 2007 17:11:42 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0015_01C7B427.3CE037C0" 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_0015_01C7B427.3CE037C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I know Kelly, I was kinda waiting for Larry to emerge on this list, then = get Bill J. to do a nice 3D. It's not at all difficult or complex. George ( down under) George, Let me get this straight.........Steel tube TIG welded to steel = insert.......Then aluminum=20 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=20 "Dyke Delta"_13B ROTARY Engine=20 "RWS"_RD1C/EC2/EM2=20 "Mistral"_Backplate/Oil Manifold=20 -------------- Original message from "George Lendich" = : --------------=20 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)=20 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? =20 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? =20 Cheers, Rusty ------=_NextPart_000_0015_01C7B427.3CE037C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I know Kelly, I was kinda waiting for = Larry to=20 emerge on this list, then get Bill J. to do a nice 3D.

It's not at all difficult or = complex.

George ( down under)

George,

Let me get this straight.........Steel tube = TIG welded=20 to steel insert.......Then aluminum

insert with O-ring (s) to seal to the steel tube.......? A sketch = would=20 be worth a thousand

words for the engineering challenged........

--
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 --------------

Rusty,
I Heard similar = stories, but am=20 sure Lynn is correct in that, if their done correctly their OK. The = one's=20 I seen weren't so good.

The new method of welding to the = steel liner,=20 eliminates any possible leak. I originally suggested welding to the = inner=20 and outer aluminium, but someone suggested that wasn't feasible, as = it was=20 too difficult to get access to.

So Tig welding to the steel = liner is good=20 but you have to use a steel tube - which you can't weld externally. = So I=20 came up with a method of Tig welding a aluminium tube and flange to = the=20 exterior, which has an O ring seal to the steel tube, and passed it = by Bill=20 J. who felt it was a good idea. Probably could use a couple of = O rings=20 if you felt like it. The advantage of this is that the O ring will = allow for=20 differing expansion and contraction rates which might put stress on = the=20 inner tig welding. Am elegant solution IMHO.

On the side ports, your suggestion = would be=20 OK.

Of course the factory PP were = integral to the=20 injection casting.

George ( down = under)

Greetings,

One of = the things=20 that's always bothered me about making a PP housing is = leakage. I've=20 heard very experienced folks say that eventually, any PP housing = you make=20 will leak, and it's easy for me to imagine that = happening. I=20 don't think I've heard the same thing about factory housings = though. =20 How are the=20 ports installed in the factory PP housing? =

The other = problem=20 with a conversion is the side ports. I know people fill = these with=20 their favorite epoxy, but I'd worry about that coming loose, and = getting=20 into the rotor. How much would it hurt the PP operation = if you=20 just sealed the ports on the outside of the side housings with a = plate=20 where the intake would have been?

Cheers,

Rusty

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