X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [66.219.56.245] (HELO mail.qnsi.net) by logan.com (CommuniGate Pro SMTP 5.4.5) with ESMTP id 5560438 for flyrotary@lancaironline.net; Fri, 25 May 2012 15:04:31 -0400 Received-SPF: none receiver=logan.com; client-ip=66.219.56.245; envelope-from=bhughes@qnsi.net Received: from 10.0.0.5 ([10.0.0.5]) by qnsi-mail.qnsi.net ([10.0.0.5]) with Microsoft Exchange Server HTTP-DAV ; Fri, 25 May 2012 19:03:54 +0000 Subject: Re: [FlyRotary] High speed taxi part 2 w/nose lift References: From: "Bobby J. Hughes" Content-Type: text/plain; charset="us-ascii" In-Reply-To: Message-ID: Date: Fri, 25 May 2012 14:03:48 -0500 To: "Rotary motors in aircraft" Content-Transfer-Encoding: quoted-printable thread-topic: [FlyRotary] High speed taxi part 2 w/nose lift thread-index: Ac06qSFCevxXqyPjQHqTGmndaT/Ybg== MIME-Version: 1.0 (1.0) Sounds like you made lots of progress. Be careful and keep the reports com= ing.=20 Bobby=20 Sent from my iPhone On May 25, 2012, at 1:33 PM, "Chris Barber" wrot= e: > After getting my DAR inspection and Repairman Certificate a few weeks ago,= I did two high speed taxi test with disappointing results. The engine temps= on my two rotor 13b rotary were extremely high. Well into the 250 degree ra= nge after the long taxi (9000 foot runway) and the quick jaunt down 17R. Obv= iously unacceptable. I did seem to avoid engine damage apparently by grace a= nd the short duration.=20 >=20 > Over the last few weeks I have focused on cooling mods. This time I follow= ed the advice from Paul Lamar's book "How to Cool Your Wankle" more honestly= and put the oil and coolant heat exchangers under the engine and a bit into= the airstream for solid ram air.=20 >=20 > Today I repeated the long taxi for high speed taxi test 3. Outside temp wa= s 96 degrees. Temps down Hotel stayed around 165 degrees to Alpha. I had to w= ait for a Grauman to take off. Ran the engine up a bit to verify mixture. By= the time I called the tower to take the active coolant temps had gotten to a= bout 185.=20 >=20 > I took a breath and smoothly added power and started my run down the cente= r line. Speed came in as I brought power to just over 5000 RPM. I reached 60= knots really quickly. (posted rotation speed range). I retarded the power a= bit to maintain 60 ish knots took a mental breath....and raised the nose. T= he nose actually lifted Holy crap....that is almost flight. I brought back p= ower and the nose settled (uh, by settled, I mean bounced ;-)).=20 >=20 > Ok. While really cool to me, the coolest part was when I noticed that when= I checked the coolant temp just as the nose was down, the coolant temp had D= ROPPED to the high 170's. A drop. Imagine that!!! >=20 > I pulled off at Charlie and taxied back to my hangar with the temps around= . 185. They just hit 190 before I shut down. Again, it is in the mid 90's to= day.=20 >=20 > I don't know about y'all, but this has been a pretty good day off so far.=20= >=20 > Thanks for your support.=20 >=20 > Chris Barber > Houston KEFD > Velocity SE/FG > Rotary 13b turbo w/Mistral Intake > RWS PSRU/EC2/EM2 > Dynon SkyView SV-7 >=20 > Sent from my iPhone 4 > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List= .html