Return-Path: Received: from sam.the-i.net ([206.136.176.251]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-70783U4500L450S0V35) with ESMTP id com for ; Tue, 6 Mar 2001 15:09:24 -0500 Received: from pavilion (unverified [206.136.176.234]) by sam.the-i.net (Vircom SMTPRS 4.4.184) with SMTP id for ; Tue, 6 Mar 2001 14:18:12 -0600 Message-ID: <001f01c0a67b$a72ff4a0$eab088ce@pavilion> From: "J. N. Cameron" To: "Lancair List" Subject: Exhaust pipe hangers Date: Tue, 6 Mar 2001 14:25:55 -0600 X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> A few days ago there was a discussion on hanger materials for exhaust pipes. The other day I had a chance to sneak around underneath a Cirrus SR20 parked at our local airstrip. I was interested in seeing how they hang those extra-long pipes for their "tuned induction" exhaust. The straight portion that extends aft parallel to the belly sisbout three of my handspans long, which is roughly 27". Nifty system: They have a metal strap about an inch wide sticking out of each side of the exhaust tunnel, and a strap welded around the bottom half of the exhaust pipe. The strap on the exhaust pipe has an ear sticking out each side for about an inch. Each strap has a hole in its end and the straps and the pipe are connected with a spring on each side. They've apparently played with the spring rate to get the right balance of flex and support. The same thing could be done on the ES (and other models, I suspect), by simply bolting the support straps through the fuselage flange with countersunk screws. The cowling would then cover those screw heads. I plan to contact the parts department at Cirrus to see if I can buy the springs from them. Springs seem like a hard thing to find in just the right size, length, and spring rate. If I'm successful, I'll post the results. This seems like a better system than the reinforced rubber straps that have to be bolted through the firewall. Jim Cameron ES builder >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>