X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtai13.cox.net ([68.230.241.46] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1099209 for flyrotary@lancaironline.net; Wed, 10 May 2006 12:39:20 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.46; envelope-from=ALVentures@cox.net Received: from BigAl ([72.192.132.90]) by fed1rmmtao11.cox.net (InterMail vM.6.01.06.01 201-2131-130-101-20060113) with ESMTP id <20060510163520.MDJW9215.fed1rmmtao11.cox.net@BigAl> for ; Wed, 10 May 2006 12:35:20 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Aux cooling during tests Date: Wed, 10 May 2006 09:35:29 -0700 Message-ID: <000501c6744f$bf9fff10$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C67415.13412710" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2869 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C67415.13412710 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit 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. Sounds simple enough (of course installation at this point is not simple). Does that tubing withstand contact with 225F cooler?? 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. Unfortunately; no water supply available at the hangar. Maybe one my grandkids "water blaster" water guns. Al 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 ------=_NextPart_000_0006_01C67415.13412710 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Just the Basics:

<= /font>

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.

Sounds simple enough (of course installation at this point is not simple). Does that tubing withstand = contact with 225F cooler??

<= /font>

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.

Unfortunately; no water supply = available at the hangar. Maybe one my grandkids “water blaster” = water guns.

Al

<= /font>

Tracy

=

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

From: Al Gietzen

To: Rotary motors in = aircraft

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

Subject: [FlyRotary] Airworthiness

<= /font>

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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