X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from an-out-0708.google.com ([209.85.132.246] verified) by logan.com (CommuniGate Pro SMTP 5.2.6) with ESMTP id 3061396 for flyrotary@lancaironline.net; Mon, 04 Aug 2008 17:36:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.132.246; envelope-from=cozy4pilot@gmail.com Received: by an-out-0708.google.com with SMTP id b38so368268ana.81 for ; Mon, 04 Aug 2008 14:35:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:reply-to:from:to:in-reply-to :subject:date:message-id:mime-version:content-type:x-priority :x-msmail-priority:x-mailer:importance:x-mimeole; bh=KRlNJvyTwyW4DgEQgtxvPJReAdAg2B0kDo4eq+mkxWA=; b=F6GGTEQtUW1Iv63lOVk56KiuvRoaVcGKco5FbyUjMRy7QaT/8m3MMMCkn5YlR+6sSx vn4HzwpA1vGItd3j6O0ls1aYz8u2OPRN4padqhS6pDklYxU/CnmXgSv+IyHBaahjio0W yX1/qiac8dDa4O0p/CsEVZ/3oZbWnEy79bymE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=reply-to:from:to:in-reply-to:subject:date:message-id:mime-version :content-type:x-priority:x-msmail-priority:x-mailer:importance :x-mimeole; b=ZGA2E90FBK5AoaPRBU+M+xYtG/aOXRjxmGqzZedo75avuaAukJGp7QFParb1d36uEF ZkNpVBAWMdi+fbGmF7zdlTHQ+CDDo9fvtqMTK8KM1qvNcdvh530qmLtEARpX9ua0UNLV S6XMEIGoDKC6bqhheB+swqfOZ6TTypngZFuAM= Received: by 10.100.41.15 with SMTP id o15mr390282ano.48.1217885721216; Mon, 04 Aug 2008 14:35:21 -0700 (PDT) Return-Path: Received: from HomePC ( [76.4.221.180]) by mx.google.com with ESMTPS id l22sm7749000wrl.30.2008.08.04.14.35.18 (version=SSLv3 cipher=RC4-MD5); Mon, 04 Aug 2008 14:35:20 -0700 (PDT) Reply-To: From: "Steve Brooks" To: "Rotary motors in aircraft" In-Reply-To: Subject: RE: [FlyRotary] Re: Back in the air Date: Mon, 4 Aug 2008 17:34:12 -0400 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0052_01C8F658.4F58E540" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0) Importance: Normal X-MIMEOLE: Produced By Microsoft MimeOLE V6.0.6000.16545 This is a multi-part message in MIME format. ------=_NextPart_000_0052_01C8F658.4F58E540 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Al, That's good to know about your Velocity. I missed the fact that you had a fan on your installation. I have a couple of other tests I would like to do. One as you suggest, climb up, level off, and then see what the temperatures stabilize at. I suspect that you are right about it coming down on its own. Secondly, I'd like to turn the fan on prior to takeoff, and see what the temperature do with the cooling fan on the whole time. Steve -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Al Gietzen Sent: Monday, August 04, 2008 3:10 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Back in the air With a pusher, a fan is pretty much a necessity for cooling on the ground. On my Velocity I found that the negative pressure from the prop did result in some airflow through the rad in the cowl; which did OK on cool days, but fan made a significant difference, and now taxing and waiting for takeoff clearance on not an issue even on hot days. I have found that the fan makes no noticeable difference on cooling when at flight speeds whether on or off; and the cooling in flight is not reduced since installing the fan. I think if you had waited a bit longer in flight the temp would have come down without the fan on; other wise I would not expect it to stay stable at 180 without the fan. Al The new cooling system also has a cooling fan which I was able to integrate into the plenum holding the radiator. At 95 F degrees OAT, and turning the fan on at about 190 F degrees coolant temperature, The fan maintained 180 F for 20 minutes of ground operation, including some high power testing. This morning OAT was about 78 F, which is very good for North Carolina in August, I wanted something less than 95 F for the first test of the new cooling system. I did not use the cooling fan for taxi or takeoff, as I wanted to see what the cooling was without the fan. I took of and climbed up to about 1200' AGL. The coolant was up to about 205, and oil at 185. I leveled off and reduced the throttle to normal cruise power. I watched the coolant temperature for a little while (maybe 15-20 seconds), and it seemed to stay at the 205 F reading. I wish now that I'd been a little more patient, but I kicked on the cooling fan, and the temperature came down pretty quickly to slightly above 180 F. I turned the fan off again and the temperature stayed right there. I did power up and climb another 300 feet or so, but really didn't push it too hard on the first flight. The temperature didn't really move too much during the brief climb. All other systems ran perfectly and it was a very nice flight. I did stay within gliding distance of the runway the whole flight, but based on zero squawks on this flight, the next one will be longer. While I would like to have seen a little better performance, I was happy with the improved cooling over the old system. Climbing to pattern altitude old the old system at today's temperature would have been 215 - 220F. On the next flight, I'll take off using the cooling fan, and see what kind of numbers I get with it. I hope to see something more in the 185-190 range, but I'll have to see what the real number are. Steve Brooks Cozy MKIV N75CZ Turbo rotary ------=_NextPart_000_0052_01C8F658.4F58E540 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Al= ,

Th= at’s good to know about your Velocity.  = I missed the fact that you had a fan on your installation.   I have a couple of other tests I would like to = do.  One as you suggest, climb up, = level off, and then see what the temperatures stabilize at.  I suspect that you are right about it coming down on = its own.  Secondly, I’d like to = turn the fan on prior to takeoff, and see what the temperature do with the cooling fan on the = whole time.

 

St= eve

 

-----Original Message-----
From: Rotary motors in = aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Al Gietzen
Sent: Monday, August 04, = 2008 3:10 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = Back in the air

 

With a pusher, a fan is pretty much a necessity for cooling on the = ground.  On my Velocity I found that the negative pressure from the prop did result = in some airflow through the rad in the cowl; which did OK on cool days, but fan = made a significant difference, and now taxing and waiting for takeoff clearance = on not an issue even on hot days.<= /p>

 <= /p>

I have found that the fan makes no noticeable difference on cooling when = at flight speeds whether on or off; and the cooling in flight is not = reduced since installing the fan.  I think if you had waited a bit longer in = flight the temp would have come down without the fan on; other wise I would not = expect it to stay stable at 180 without the fan.<= /p>

 <= /p>

Al<= /p>

 <= /p>

The new cooling system also has a cooling fan which I was able to integrate = into the plenum holding the radiator.  At 95 F degrees OAT, and turning = the fan on at about 190 F degrees coolant temperature, The fan maintained 180 F = for 20 minutes of ground operation, including some high power = testing.<= /p>

 <= font color=3Dblack><= /p>

This morning OAT was about 78 F, which is very good for North Carolina in August,  I wanted something less than 95 F for the first test of = the new cooling system.  I did not use the cooling fan for taxi or takeoff, = as I wanted to see what the cooling was without the fan.  I took of and = climbed up to about 1200’ AGL.  The coolant was up to about 205, and = oil at 185.  I leveled off and reduced the throttle to normal cruise = power.  I watched the coolant temperature for a little while (maybe 15-20 = seconds), and it seemed to stay at the 205 F reading.  I wish now that I’d = been a little more patient, but I kicked on the cooling fan, and the temperature came = down pretty quickly to slightly above 180 F.  I turned the fan off again = and the temperature stayed right there.  I did power up and climb = another 300 feet or so, but really didn’t push it too hard on the first = flight.  The temperature didn’t really move too much during the brief = climb.  All other systems ran perfectly and it was a very nice flight.  I did stay = within gliding distance of the runway the whole flight, but based on zero = squawks on this flight, the next one will be longer.<= /p>

 <= font color=3Dblack><= /p>

While I would like to have seen a little better performance, I was happy with = the improved cooling over the old system.  Climbing to pattern altitude = old the old system at today’s temperature would have been 215 – = 220F.  On the next flight, I’ll take off using the cooling fan, and see what = kind of numbers I get with it.  I hope to see something more in the 185-190 range, = but I’ll have to see what the real number are. = <= /p>

 <= font color=3Dblack><= /p>

 <= font color=3Dblack><= /p>

Steve Brooks

Cozy MKIV N75CZ

Turbo rotary

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