X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from vms042pub.verizon.net ([206.46.252.42] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1099200 for flyrotary@lancaironline.net; Wed, 10 May 2006 12:31:32 -0400 Received: from verizon.net ([71.99.155.46]) by vms042.mailsrvcs.net (Sun Java System Messaging Server 6.2-4.02 (built Sep 9 2005)) with ESMTPA id <0IZ2008SF5WGM005@vms042.mailsrvcs.net> for flyrotary@lancaironline.net; Wed, 10 May 2006 11:31:29 -0500 (CDT) Date: Wed, 10 May 2006 12:31:22 -0400 From: Finn Lassen Subject: Re: [FlyRotary] Re: Aux cooling during tests In-reply-to: To: Rotary motors in aircraft Message-id: <4462155A.9010907@verizon.net> MIME-version: 1.0 Content-type: multipart/alternative; boundary=------------040506010202080300060503 X-Accept-Language: en-us, en References: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax; PROMO) This is a multi-part message in MIME format. --------------040506010202080300060503 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Careful with the spray nozzle! Those fins bend over faily easily! Finn Tracy Crook wrote: > Just the Basics: > > One gallon jug of distilled water in any convenient location. > Aftermarket windshield washer pump available at any auto parts store > (about $12) > Drip irrigation tubing (1/4" OD) or similar to connect things up. > Holes in tubing made with hot wire, laid across cooler. > Switch on pump when cooling needed. > > For static testing, a better solution is a garden hose with a spray > nozzle. Hose down the coolers liberally when needed. This is the > method used on my test stand. > > Tracy > > ----- Original Message ----- > From: Al Gietzen > To: Rotary motors in aircraft > Sent: Wednesday, May 10, 2006 10:31 AM > Subject: [FlyRotary] Airworthiness > > 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 > > > > > --------------040506010202080300060503 Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Careful with the spray nozzle! Those fins bend over faily easily!

Finn

Tracy Crook wrote:
Just the Basics:
 
One gallon jug of distilled water in any convenient location.
Aftermarket windshield washer pump available at any auto parts store (about $12)
Drip irrigation tubing (1/4" OD) or similar to connect things up.
Holes in tubing made with hot wire,  laid across cooler.
Switch on pump when cooling needed.
 
For static testing, a better solution is a garden hose with a spray nozzle.  Hose down the coolers liberally when needed.  This is the method used on my test stand.
 
Tracy
----- Original Message -----
From: Al Gietzen
Sent: Wednesday, May 10, 2006 10:31 AM
Subject: [FlyRotary] Airworthiness

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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