X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4228882 for flyrotary@lancaironline.net; Wed, 21 Apr 2010 03:36:53 -0400 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (mail.aanet.com.au [203.24.100.34]) by poplet2.per.eftel.com (Postfix) with ESMTP id CE73E173828 for ; Wed, 21 Apr 2010 15:36:16 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id AD166BEC005 for ; Wed, 21 Apr 2010 15:36:15 +0800 (WST) Message-ID: <23693DC9CBB94E59B3B9149693C9E475@ownerf1fc517b8> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: cooling for ground runs Date: Wed, 21 Apr 2010 17:36:20 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000D_01CAE179.2781C970" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 100420-1, 04/20/2010), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_000D_01CAE179.2781C970 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable In a message dated 4/20/2010 9:25:16 PM Pacific Daylight Time, = shipchief@aol.com writes: I'm thinking an aluminum plate of 6061 could be cut, drilled, = milled, then the wear faces "Nikasil" equivalent electroplated. Is that fairly straightforward if P Ported?=20 Chief, Yes, that is a possible method. Do something for me. Look up the = coefficient of linear expansion for aluminum. Then look up the = coefficient of linear expansion for chrome (or Nickasil). You will find = that the aluminum is about 10^-5 units per degree F. Chrome is about = 10^-6 or 7 units per degree F. Every time the engine heats up the = aluminum is trying to expand itself right past the coating. It work = fairly well in a bore, and less well on a flat surface. That is why = Mazda paid so much money to do detonation gun coatings on their all = aluminum Le Mans engine. I checked on these coatings and they are just = silly expensive. The raw coating was about 1000 dollars per FACE and = then you need to lap it. In a car used for road racing Nickasil might = hold up, but think about putting that car on a track with a 200 mile = long straight-away. That is what our aircraft use is like. I am not one = of the dumb car engines can take it guys, but there are differences and = some of those differences make it tough to just use coatings. Not = impossible, but expensive. Now if you could make an intermediate housing = that was one pound heaver than aluminum but had none of the problems, = while still being around 12-15 pounds lighter than the stocker, doesn't = it sound like a good idea? Bill Jepson Bill, Well said - now what are you going to charge us - I want mates rates. George ( down under) ------=_NextPart_000_000D_01CAE179.2781C970 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
 
In a message dated 4/20/2010 9:25:16 PM Pacific Daylight Time, shipchief@aol.com writes:
I'm thinking an aluminum plate of 6061 could be cut, drilled, = milled,=20 then the wear faces "Nikasil" equivalent electroplated.
Is that fairly straightforward if P Ported?=20
Chief,
Yes, that is a possible method. Do something for me. Look up the=20 coefficient of linear expansion for aluminum. Then look up the = coefficient of=20 linear expansion for chrome (or Nickasil). You will find that the = aluminum is=20 about 10^-5 units per degree F. Chrome is about 10^-6 or 7 units per = degree F.=20 Every time the engine heats up the aluminum is trying to expand itself = right=20 past the coating. It work fairly well in a bore, and less well on a = flat=20 surface. That is why Mazda paid so much money to do detonation gun = coatings on=20 their all aluminum Le Mans engine. I checked on these coatings and = they are=20 just silly expensive. The raw coating was about 1000 dollars per FACE = and then=20 you need to lap it. In a car used for road racing Nickasil might hold = up, but=20 think about putting that car on a track with a 200 mile long = straight-away.=20 That is what our aircraft use is like. I am not one of the dumb car = engines=20 can take it guys, but there are differences and some of those = differences make=20 it tough to just use coatings. Not impossible, but expensive. Now if = you could=20 make an intermediate housing that was one pound heaver than aluminum = but had=20 none of the problems, while still being around 12-15 pounds lighter = than the=20 stocker, doesn't it sound like a good idea?
Bill Jepson
 
Bill,
Well said - now what are you going to charge us - I want mates=20 rates.
George ( down under)
 
 
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