X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from hub026-NJ-4.exch026.serverdata.net ([206.225.166.167] verified) by logan.com (CommuniGate Pro SMTP 6.0c1) with ESMTPS id 5727387 for flyrotary@lancaironline.net; Fri, 24 Aug 2012 11:50:30 -0400 Received-SPF: none receiver=logan.com; client-ip=206.225.166.167; envelope-from=jwhaley@datacast.com Received: from MBX026-E1-NJ-6.exch026.domain.local ([10.240.14.56]) by HUB026-NJ-4.exch026.domain.local ([10.240.14.39]) with mapi id 14.02.0309.002; Fri, 24 Aug 2012 08:49:56 -0700 From: Jeff Whaley To: 'Rotary motors in aircraft' Subject: Re: [flyRotary] Spreadsheet Cooling Section Thread-Topic: Re: [flyRotary] Spreadsheet Cooling Section Thread-Index: Ac2CEBsWVqKbTOgkQdmtaayM3Zo4Mg== Date: Fri, 24 Aug 2012 15:49:55 +0000 Message-ID: <234B758DE9A64449BEB6BB5D1345CA7A10C03720@mbx026-e1-nj-6.exch026.domain.local> Accept-Language: en-CA, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [209.87.232.162] Content-Type: multipart/related; boundary="_005_234B758DE9A64449BEB6BB5D1345CA7A10C03720mbx026e1nj6exch_"; type="multipart/alternative" MIME-Version: 1.0 --_005_234B758DE9A64449BEB6BB5D1345CA7A10C03720mbx026e1nj6exch_ Content-Type: multipart/alternative; boundary="_000_234B758DE9A64449BEB6BB5D1345CA7A10C03720mbx026e1nj6exch_" --_000_234B758DE9A64449BEB6BB5D1345CA7A10C03720mbx026e1nj6exch_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Ed, you did say he cooling chart is not quite where it should be ... Plugging some numbers in there is very interesting; however, not to be too = critical but I think the constants used to calculate HP Vs OAT Vs Cooling C= apacity are a bit fuzzy. For example, at any RPM, AF, HP, simply increasing the OAT value in the sp= readsheet results in improved cooling capacity ... My installation's capaci= ty to cool was much more influenced by OAT than the resulting change in HP = due to OAT . I had no cooling problems at 50F but had big problems at 100F= ... The spreadsheet indicates opposite. Jeff From: Ernest Christley Subject: Re: [FlyRotary] Spreadsheet Cooling Section Date: Fri, 24 Aug 2012 10:41:30 -0400 To: Rotary motors in aircraft [Message Header] [Undecoded Message] Ed Anderson wrote: > But, as stated before the cooling section is on less solid ground due to > the fact that installation variables play such a large role in cooling > and they are not taken into consideration. But, you can play with it to > see the effects of changing several variables on cooling. > > Ed > Just been playing with this, pulling data out of my data logs. I don't hav= e all my numbers exact yet, but I think this will be useful for making a SWAG at determining if the system will stay wit= hin safety margins during various phases of flight. Would it be to much to ask those with flying machines if they can go out an= d determine where their system starts to warm up, which would be a rough indication of where the cooling capacity is exce= eded? I thinking of doing a steep climbout and slowly dropping the nose until the temps start coming down, noting the = temp, MAP, airspeed and AFR at that point. I don't think it is necessary to tell grown people that built their own airpl= ane that they need to be careful about airspeed while doing something like this. If we can get a variety of sam= ples, we can put error bars around the numbers that the spreadsheet gives. This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unauth= orized disclosure is strictly prohibited. If you have received this message= in error, please notify us immediately so that we may correct our internal= records. Please then delete the original message. Thank you. --_000_234B758DE9A64449BEB6BB5D1345CA7A10C03720mbx026e1nj6exch_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Ed, you did say he cooling chart is not quite where = it should be …

Plugging some numbers in there is very interesting; = however, not to be too critical but I think the constants used to calculate= HP Vs OAT Vs Cooling Capacity are a bit fuzzy.

For example, at any RPM, AF, HP,  simply increa= sing the OAT value in the spreadsheet results in improved cooling capacity = … My installation’s capacity to cool was much more influenced b= y OAT than the resulting change in HP due to OAT .  I had no cooling problems at 50F but had big problems at 100F … The = spreadsheet indicates opposite.

Jeff

 

From:

Ernest Christley <echristley@att.net= >

Subject:

Re: [FlyRotary] Spreadsheet Cooling Sec= tion

Date:

Fri, 24 Aug 2012 10:41:30 -0400<= /p>

To:

Rotary motors in aircraft <flyrotary= @lancaironline.net>

3D"Message

=

Ed Anderson wrote:<= span style=3D"font-size:10.0pt; font-family:"Courier New"">

 

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