Return-Path: <13brv3@bellsouth.net> Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3066957 for flyrotary@lancaironline.net; Sat, 06 Mar 2004 21:43:09 -0500 Received: from rad ([65.0.137.72]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with ESMTP id <20040307024308.LIEM13717.imf16aec.mail.bellsouth.net@rad> for ; Sat, 6 Mar 2004 21:43:08 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: I'm exhausted Date: Sat, 6 Mar 2004 20:41:05 -0600 Message-ID: <015101c403ed$a3f54830$6001a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0152_01C403BB.595AD830" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0152_01C403BB.595AD830 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Err... do I detect a missing motor mount tube in the vicinity of the = exhaust headers?. =20 =20 It's not missing. I still have it in a pile of scrap metal :-) =20 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 =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 =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 =20 Cheers, Rusty (have hacksaw, will hack) =20 ------=_NextPart_000_0152_01C403BB.595AD830 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Err... do I detect a missing = motor mount tube=20 in the vicinity of the exhaust headers?.   
 
It's not missing.  I still have it in a = pile of scrap=20 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 of=20 the turbo manifold.  
 
When I dumped the turbo, and giant = radiator, I noticed=20 that the tube would be in the way of the exhaust.  I called = Fred, and=20 asked about hacking them off.  For the record, he would prefer that = I had=20 left them, but considering the reduction in weight, and my reduced = interest in=20 high G aerobatics, he agreed that it should be fine, as long as I cut = off both=20 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 on=20 your mount.  This was a special case, where the tubes were = added after=20 the stress analysis was = done.  
 
Cheers,
Rusty=20 (have hacksaw, will hack)   
------=_NextPart_000_0152_01C403BB.595AD830--