X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao01.cox.net ([68.230.241.38] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1099019 for flyrotary@lancaironline.net; Wed, 10 May 2006 10:32:01 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.38; envelope-from=ALVentures@cox.net Received: from BigAl ([72.192.132.90]) by fed1rmmtao01.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20060510143109.MNLR25692.fed1rmmtao01.cox.net@BigAl> for ; Wed, 10 May 2006 10:31:09 -0400 From: "Al Gietzen" To: "Rotary motors in aircraft" Subject: Airworthiness Date: Wed, 10 May 2006 07:31:17 -0700 Message-ID: <000001c6743e$66236d70$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C67403.B9C49570" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C67403.B9C49570 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Good News: Velocity N755V received FAA airworthiness certification yesterday. Also survived an intensive 4-hr inspection by a factory authorized insurance inspector with a small list of minor items to attend to. Not So Good News: Main issue now seems to be cooling during ground operations, particularly oil cooling, and the secondary temporary issue of mixture reprogramming (again, after software update). With the wing root cooler in a pusher configuration there is almost no oil cooling when standing still. So running at significant power to adjust mixture allows little time to do anything before reaching temp limits. Then, with cowl on, it takes hours for it to cool down. My expectation was for enough natural convection cooling on the ground to handle low power taxi operations. Earlier static running suggested that there would be sufficient time, but I'm finding that; a) taxi maneuvering with brake steering takes more power than anticipated, and b) the 3" thick, 16 fins/in. oil cooler core has almost no natural-convection cooling. Have no good ideas at the moment how to improve this situation. Haven't gotten to high speed 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 negative pressure generated by the prop aft of the cowl. More later, Al ------=_NextPart_000_0001_01C67403.B9C49570 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Good News:  Velocity N755V received FAA = airworthiness certification yesterday.  Also survived an intensive 4-hr = inspection by a factory authorized insurance inspector with a small list of minor items = to attend to.

 

Not So Good News:  Main issue now seems to be = cooling during ground operations, particularly oil cooling, and the secondary = temporary issue of mixture reprogramming (again, after software update). =  With the wing root cooler in a pusher configuration there is almost no oil = cooling when standing still.  So running at significant power to adjust mixture = allows little time to do anything before reaching temp limits. Then, with cowl = on, it takes hours for it to cool down.

 

My expectation was for enough natural convection = cooling on the ground to handle low power taxi operations.  Earlier static = running suggested that there would be sufficient time, but I’m finding = that; a) taxi maneuvering with brake steering takes more power than anticipated, and = b) the 3” thick, 16 fins/in. oil cooler core has almost no natural-convection = cooling. Have no good ideas at the moment how to improve this situation.  = Haven’t gotten to high speed 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 negative pressure generated by the prop aft of the = cowl.

 

More later,

 

Al

 

 

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