X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ms-smtp-02.southeast.rr.com ([24.25.9.101] verified) by logan.com (CommuniGate Pro SMTP 5.1c.5) with ESMTP id 1450910 for flyrotary@lancaironline.net; Mon, 09 Oct 2006 07:16:05 -0400 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.101; envelope-from=echristley@nc.rr.com Received: from [192.168.0.248] (cpe-066-057-036-199.nc.res.rr.com [66.57.36.199]) by ms-smtp-02.southeast.rr.com (8.13.6/8.13.6) with ESMTP id k99BFgFT027939 for ; Mon, 9 Oct 2006 07:15:42 -0400 (EDT) Message-ID: <452A2E06.3030603@nc.rr.com> Date: Mon, 09 Oct 2006 07:09:58 -0400 From: Ernest Christley User-Agent: Thunderbird 1.5.0.5 (X11/20060808) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Fuselage duct completed References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: Symantec AntiVirus Scan Engine James Maher wrote: > Ernest, > It looks like you put a lot of effort into this ducting design. > I really hope that it works as intended. > Did you check the heat distortion temp of the resin that you used? > Generally they are around 200F+-25F. > This would be a concern as the temps could get that high in that area and you would not want the ducts melting. > > It's a valid concern, Jim. Fortunately, I'm not blazing any new trails here. Several of the canard guys that are flying have done it this way. Just talked to Steve Brooks this weekend (he helped me with a very large layup) to confirm it. The saving facts are that the MGS epoxy system I'm using has a max TG of 230F and that the coolant temp isn't the duct/housing temp. There will be a lot of airflow that will keep the housing several degree cooler.