Return-Path: Received: from mail.viclink.com ([66.129.220.6] verified) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3139833 for flyrotary@lancaironline.net; Thu, 01 Apr 2004 01:03:04 -0500 Received: from mail.viclink.com (p087.AS1.viclink.com [66.129.192.87]) by mail.viclink.com (8.11.7/8.11.7) with ESMTP id i31631R55675 for ; Wed, 31 Mar 2004 22:03:01 -0800 (PST) Message-ID: <406BAFF6.9040303@mail.viclink.com> Date: Wed, 31 Mar 2004 22:00:22 -0800 From: Perry Mick User-Agent: Mozilla/5.0 (Windows; U; Win95; en-US; rv:1.0.1) Gecko/20020823 Netscape/7.0 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Requesting more thoughts on cooling References: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-RAVMilter-Version: 8.4.3(snapshot 20030217) (mail.viclink.com) Chad Robinson wrote: > Perry Mick wrote: > >> I'm not sure I can offer much help John. The ducted fan cools my >> installation on the ground so I can run it indefinitely. I know if I >> take the fanduct off, it will eventually overheat just idling on the >> ground. >> >> I think I saw on your website you have a cooling fan installed on >> your rad? That should help. >> >> On my first flight the coolant temp was not a problem (never has >> been) but oil temp went to 240. I stayed in the pattern (I was >> planning to go high and feel things out) but I had to go around twice >> and didn't get it down until the 3rd approach. >> Best advise I can offer is "fly the plane" (origin Burt Rutan: don't >> get distracted by some anomaly and forget to fly the airplane). > > > Perry, out of curiosity what's the current status of your duct work? > Have you worked on "fan 4" yet? What airspeeds are you seeing? > > Reards, > Chad > I haven't made any duct or fan mods for years now. Same duct and fan since 10 hours on the Hobbs, October 1999. A year ago I finally made a new intake manifold and got it off the top of the engine and got some weight out in the process. Reshaped the cowl, got the bumps out, gained 5 knots. I now cruise at about 160 mph and 7.5 gph (at altitude). Engine is stock '86 and estimated HP is around 120 at 5200 RPM (near S.L.). So compared to an O-235 Long-EZ my fuel burn might be slightly higher and cruise speed about 20 mph slower. I can't see making any more duct/fan changes unless I make other changes to drastically increase HP, such as porting, turbocharger, etc. I just don't see where I could possibly squeeze in a turbocharger and an intercooler, there is just no room. Then I would need a larger rad, no room for that either. So for now, the plane is nearing "completion". 450 hours in 4 years 8 months. -- Perry Mick http://www.ductedfan.com