X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from mail29.syd.optusnet.com.au ([211.29.132.171] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTPS id 2029147 for flyrotary@lancaironline.net; Sun, 06 May 2007 19:33:59 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.171; envelope-from=lendich@optusnet.com.au Received: from george (d220-237-222-12.dsl.nsw.optusnet.com.au [220.237.222.12]) by mail29.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l46NWtRb024710 for ; Mon, 7 May 2007 09:32:57 +1000 Message-ID: <000a01c79036$e301d3d0$0cdeeddc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Engine mount mockup Date: Mon, 7 May 2007 09:32:58 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01C7908A.B32B8990" 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_0007_01C7908A.B32B8990 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Lynn, Had the same concerns myself at first glance, but when advised that it = was standard on light weight engine mounts, I felt a little better about = it. My approach would have been a piece of triangled 4130 - of course this = causes bolt/nut access problems, but could be overcome, in a number of = ways. What it does give is a nice flat area on which to weld the tubes as well = as a wider area to spread the load and two bolts through the firewall = hard points, compared to one. One idea might be a triangle with two small tubes to carry the firewall = bolts. Just some of my thoughts on the subject, always looking for better = ways!! George ( down under) ----- Original Message -----=20 From: Lehanover@aol.com=20 To: Rotary motors in aircraft=20 Sent: Sunday, May 06, 2007 10:44 PM Subject: [FlyRotary] Re: Engine mount mockup In a message dated 5/5/2007 8:38:49 P.M. Eastern Daylight Time, = M.Silvius@worldnet.att.net writes: Kelly: The angle bracket on the firewall is actually per the design of the = Falconar F-12. A lot of Jodel engine mounts are this as well. The plans are = unclear as to material it only indicates 1&=BD" x1/8 thick angle. I tried = finding this in 4130 but was unable to so I settled for mild steel. The = triangular end caps are a great idea and I think I will use it. The design does = call, for a strap to be welded so that it bridges the tube to angle iron on the = back side as well. Here is an example as seen on Hans Teijgeler's Jodel = DR1050 with a Subaru in Holland. The design is not what is commonly seen for that kind of junction. It = leaves the angles in bending along the fold lines. However, if the loads = are not enough to cycle the joint in bending, then it's good enough. The = mild steel to 4130 connection is OK for light loads. The angle inserts in 4130 would help a bit. Double the part of the = angle against the firewall with a piece of 1/8 4130 as a big washer but = don't load the bend (or weld area). Paint the bend and the tube to angle joints with just a bit of white = lacquer. Grit blast the joints with rice hulls and paint without any = primer. Just enough to prevent rusting.=20 Should a problem develop, the paint will crack along the failure and = be obvious. Enamels and powder coats will stretch and conceal the crack. = Lynn E. Hanover=20 -------------------------------------------------------------------------= ----- See what's free at AOL.com. ------=_NextPart_000_0007_01C7908A.B32B8990 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Lynn,
Had the same concerns myself at first glance, but = when advised=20 that it was standard on light weight engine mounts, I felt a little = better about=20 it.
My approach would have been a piece of triangled = 4130 - of=20 course this causes bolt/nut access problems, but could be overcome, = in a=20 number of ways.
What it does give is a nice flat area on which to = weld the=20 tubes as well as a wider area to spread the load and two bolts through = the=20 firewall hard points, compared to one.
One idea might be a triangle with two small tubes to = carry the=20 firewall bolts.
Just some of my thoughts on the subject, always = looking for=20 better ways!!
George ( down under)
----- Original Message -----
From:=20 Lehanover@aol.com
Sent: Sunday, May 06, 2007 = 10:44 PM
Subject: [FlyRotary] Re: Engine = mount=20 mockup

In a message dated 5/5/2007 8:38:49 P.M. Eastern Daylight Time, = M.Silvius@worldnet.att.net= =20 writes:
Kelly:

The angle bracket on the firewall is actually = per the=20 design of the Falconar
F-12. A lot of Jodel engine mounts are = this as=20 well. The plans are unclear
as to material it only indicates = 1&=BD"=20 x1/8 thick angle. I tried finding this
in 4130 but was unable to = so I=20 settled for mild steel. The triangular end
caps are a great idea = and I=20 think I will use it. The design does call, for a
strap to be = welded so=20 that it bridges the tube to angle iron on the back
side as well. = Here is=20 an example as seen on Hans Teijgeler's Jodel DR1050
with a Subaru = in=20 Holland.
The design is not what is commonly seen for that kind of = junction. It=20 leaves the angles in bending along the fold lines. However, if the = loads are=20 not enough to cycle the joint in bending, then it's good enough. The = mild=20 steel to 4130 connection is OK for light loads.
 
The angle inserts in 4130 would help a bit. Double the part of = the angle=20 against the firewall with a piece of 1/8 4130 as a big washer but = don't load=20 the bend (or weld area).
 
Paint the bend and the tube to angle joints with just a bit of = white=20 lacquer. Grit blast the joints with rice hulls and paint without any = primer.=20 Just enough to prevent rusting.
 
Should a problem develop, the paint will crack along the failure = and be=20 obvious. Enamels and powder coats will stretch and conceal the=20 crack. 
 
Lynn E. Hanover 



See what's free at AOL.com.=20
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