X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.81] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1099102 for flyrotary@lancaironline.net; Wed, 10 May 2006 11:31:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.81; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 10 May 2006 08:31:02 -0700 Message-ID: Received: from 4.171.147.66 by BAY115-DAV9.phx.gbl with DAV; Wed, 10 May 2006 15:30:59 +0000 X-Originating-IP: [4.171.147.66] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Aux cooling during tests Date: Wed, 10 May 2006 11:30:55 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0058_01C67425.33CA0F50" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.20.0026.0800 Seal-Send-Time: Wed, 10 May 2006 11:30:55 -0400 X-OriginalArrivalTime: 10 May 2006 15:31:02.0108 (UTC) FILETIME=[BE9C39C0:01C67446] This is a multi-part message in MIME format. ------=_NextPart_000_0058_01C67425.33CA0F50 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 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 -----=20 From: Al Gietzen=20 To: Rotary motors in aircraft=20 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 ------=_NextPart_000_0058_01C67425.33CA0F50 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Just the Basics:

One gallon jug of distilled water in any convenient location.

Aftermarket windshield washer pump available at any auto parts = store (about=20 $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=20 method used on my test stand.

Tracy

----- Original Message -----

From: Al Gietzen

To: Rotary motors in = aircraft

Sent: Wednesday, May 10, 2006 = 10:31=20 AM

Subject: [FlyRotary] = Airworthiness

Good News: = Velocity N755V=20 received FAA airworthiness certification yesterday. Also = survived an=20 intensive 4-hr inspection by a factory authorized insurance inspector = with a=20 small list of minor items to attend to.

Not So Good = News: Main=20 issue now seems to be cooling during ground operations, particularly = oil=20 cooling, and the secondary temporary issue of mixture reprogramming = (again,=20 after software update). With the wing root cooler in a pusher=20 configuration there is almost no oil cooling when standing = still. So=20 running at significant power to adjust mixture allows little time to = do=20 anything before reaching temp limits. Then, with cowl on, it takes = hours for=20 it to cool down.

My expectation was for = enough=20 natural convection cooling on the ground to handle low power taxi=20 operations. Earlier static running suggested that there would be = sufficient time, but I=92m finding that; a) taxi maneuvering with = brake steering=20 takes more power than anticipated, and b) the 3=94 thick, 16 fins/in. = oil cooler=20 core has almost no natural-convection cooling. Have no good ideas at = the=20 moment how to improve this situation. Haven=92t gotten to high = speed taxi=20 yet to see if temps stabilize.

Tracy; can=20 you tell me the basics of your water spray system?

The in-cowl coolant = rad gets=20 reasonable air flow because of negative pressure generated by the prop = aft of=20 the cowl.

More = later,

Al

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