X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1099354 for flyrotary@lancaironline.net; Wed, 10 May 2006 14:30:49 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.68; envelope-from=atlasyts@bellsouth.net Received: from ibm69aec.bellsouth.net ([65.11.50.61]) by imf25aec.mail.bellsouth.net with ESMTP id <20060510181532.LBTC17968.imf25aec.mail.bellsouth.net@ibm69aec.bellsouth.net> for ; Wed, 10 May 2006 14:15:32 -0400 Received: from [192.168.0.100] (really [65.11.50.61]) by ibm69aec.bellsouth.net with ESMTP id <20060510181532.NITZ21011.ibm69aec.bellsouth.net@[192.168.0.100]> for ; Wed, 10 May 2006 14:15:32 -0400 Mime-Version: 1.0 (Apple Message framework v749.3) In-Reply-To: References: Content-Type: text/plain; charset=WINDOWS-1252; delsp=yes; format=flowed Message-Id: Content-Transfer-Encoding: quoted-printable From: Bulent Aliev Subject: Re: [FlyRotary] Airworthiness Date: Wed, 10 May 2006 14:15:38 -0400 To: "Rotary motors in aircraft" X-Mailer: Apple Mail (2.749.3) Congratulations Al and welcome to the pushers cooling club :). I'm =20 modifying my system too after the first 12 min. flight. installing =20 double V belts to stop the pump from slipping, and installed an extra =20= air exit on the top cowling closest to the wing. here is getting in =20 the 90s and i have no idea how it is going to cool? Buly Still waiting for the EC/EM2 to come back from Tracy. On May 10, 2006, at 10:31 AM, Al Gietzen wrote: > Good News: Velocity N755V received FAA airworthiness certification =20= > yesterday. Also survived an intensive 4-hr inspection by a factory =20= > authorized insurance inspector with a small list of minor items to =20 > attend to. > > > Not So Good News: Main issue now seems to be cooling during ground =20= > operations, particularly oil cooling, and the secondary temporary =20 > issue of mixture reprogramming (again, after software update). =20 > With the wing root cooler in a pusher configuration there is almost =20= > no oil cooling when standing still. So running at significant =20 > power to adjust mixture allows little time to do anything before =20 > reaching temp limits. Then, with cowl on, it takes hours for it to =20 > cool down. > > > My expectation was for enough natural convection cooling on the =20 > ground to handle low power taxi operations. Earlier static running =20= > suggested that there would be sufficient time, but I=92m finding =20 > that; a) taxi maneuvering with brake steering takes more power than =20= > anticipated, and b) the 3=94 thick, 16 fins/in. oil cooler core has =20= > almost no natural-convection cooling. Have no good ideas at the =20 > moment how to improve this situation. Haven=92t gotten to high speed =20= > taxi yet to see if temps stabilize. > > > Tracy; can you tell me the basics of your water spray system? > > > The in-cowl coolant rad gets reasonable air flow because of =20 > negative pressure generated by the prop aft of the cowl. > > > More later, > > > Al > > > > Buly http://tinyurl.com/dcy36