Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3066988 for flyrotary@lancaironline.net; Sat, 06 Mar 2004 22:16:08 -0500 Received: from edward (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i273G5kG020693 for ; Sat, 6 Mar 2004 22:16:06 -0500 (EST) Message-ID: <000801c403f2$8b3b8840$2402a8c0@edward> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: I'm exhausted Date: Sat, 6 Mar 2004 22:16:12 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0005_01C403C8.A2251BE0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0005_01C403C8.A2251BE0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MessageJust from looking at the number of tubes, I would say that any = risk is minimal - Fred does not underdesign {:>) Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Saturday, March 06, 2004 9:41 PM Subject: [FlyRotary] Re: I'm exhausted Err... do I detect a missing motor mount tube in the vicinity of the = exhaust headers?. =20 It's not missing. I still have it in a pile of scrap metal :-) I was afraid someone would notice that. OK, I had promised Fred that = I wouldn't mention cutting off the tubes (yes, on both sides), but since = you asked, it's probably better to tell the full story. Originally, = Fred designed the mount to be strong enough without those top tubes. = This is a challenge on a small firewall like the RV-3. I can't recall = if you can see it in the picture, but there's a 5th attachment point on = the bottom of the firewall, which was reinforced on the aircraft = structure so it could take part of the load. As the mount got close to = being complete, I decided to install the turbo, and the big heavy = radiator (strapped to the mount). Considering all the extra weight, and = the potential for up to 6 G's, Fred thought it might be wise to add the = upper tubes as insurance. I agreed, particularly since it wouldn't be = in the way of the turbo manifold. =20 When I dumped the turbo, and giant radiator, I noticed that the tube = would be in the way of the exhaust. I called Fred, and asked about = hacking them off. For the record, he would prefer that I had left them, = but considering the reduction in weight, and my reduced interest in high = G aerobatics, he agreed that it should be fine, as long as I cut off = both tubes, so as not to introduce a twisting force in the mount. =20 It is important to note that I am assuming all the responsibility for = cutting those tubes off. It is also important to remember that you = should never cut, drill, fold, spindle, or mutilate a tube on your = mount. This was a special case, where the tubes were added after the = stress analysis was done. =20 Cheers, Rusty (have hacksaw, will hack) ------=_NextPart_000_0005_01C403C8.A2251BE0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
Just from looking at the number of = tubes, I would=20 say that any risk is minimal - Fred does not underdesign = {:>)
 
Ed
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 Russell=20 Duffy
Sent: Saturday, March 06, 2004 = 9:41=20 PM
Subject: [FlyRotary] Re: I'm=20 exhausted

Err... do I detect a missing = motor mount=20 tube in the vicinity of the exhaust headers?.   
 
It's not missing.  I still have it in a = pile of=20 scrap metal :-)
 
I was afraid someone would notice that.  = OK, I had=20 promised Fred that I wouldn't mention cutting off the tubes = (yes, on=20 both sides), but since you asked,  it's probably better to = tell the=20 full story.  Originally, Fred designed the mount to be = strong=20 enough without those top tubes.  This is a challenge on a = small=20 firewall like the RV-3.  I can't recall if you can see it in the = picture,=20 but there's a 5th attachment point on the bottom of the firewall, = which was=20 reinforced on the aircraft structure so it could take part of the=20 load.   As the mount got close to being complete, I = decided to=20 install the turbo, and the big heavy radiator (strapped to the=20 mount).  Considering all the extra weight, and the potential for = up to 6=20 G's, Fred thought it might be wise to add the upper tubes as=20 insurance.  I agreed, particularly since it wouldn't be in = the way=20 of the turbo manifold.  
 
When I dumped the turbo, and giant = radiator, I=20 noticed that the tube would be in the way of the exhaust.  I = called=20 Fred, and asked about hacking them off.  For the record, he would = prefer=20 that I had left them, but considering the reduction in weight, and my = reduced=20 interest in high G aerobatics, he agreed that it should be fine, as = long as I=20 cut off both tubes, so as not to introduce a twisting force in the=20 mount.  
 
It is important to note that I am = assuming all the=20 responsibility for cutting those tubes off.  It is also = important to=20 remember that you should never cut, drill, fold, spindle, or mutilate = a tube=20 on your mount.  This was a special case, where the tubes = were added=20 after the stress analysis was=20 done.  
 
Cheers,
Rusty (have hacksaw, will=20 hack)   
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