X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wr-out-0506.google.com ([64.233.184.231] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2359209 for flyrotary@lancaironline.net; Sat, 29 Sep 2007 11:59:17 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.233.184.231; envelope-from=rwstracy@gmail.com Received: by wr-out-0506.google.com with SMTP id 76so1479958wra for ; Sat, 29 Sep 2007 08:58:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:sender:to:subject:in-reply-to:mime-version:content-type:references:x-google-sender-auth; bh=BVf75DFiBC9aMRFDvdMw5QDbEaIfquNJCM3374esFGo=; b=cPebQhQwir41mteaqF4Zy7iJC4Y1U1lkhYVKp5GNzVBsJOhPqQobKJ6QDDfIIiZJhQai6OClPjDE6QMSZLW5rX4htbpjdpRh2AANlukmFebisHbUc4AaFzePx6vDr4cHhRliJnfiVn5/PSL+Zonto1ggG2N10q4IVVWLlmW59ss= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:sender:to:subject:in-reply-to:mime-version:content-type:references:x-google-sender-auth; b=pYO1SByrPMwLEug+6DoiFNp81VyVjA9pwCBiEKn4JoubHdS7sW/kwKOzJr/olNbvQYERcpnVwrwZ1FT0Jl+OX5IEQ650k6dOjDzMR1TFTJfdhVg4p77T0EO4NLZr/h7o0cASyiwEBgwWbw9XNzEHI5+YQLpYSwwJ2ypS74vYy38= Received: by 10.90.79.6 with SMTP id c6mr8009959agb.1191081519342; Sat, 29 Sep 2007 08:58:39 -0700 (PDT) Received: by 10.143.28.1 with HTTP; Sat, 29 Sep 2007 08:58:39 -0700 (PDT) Message-ID: <1b4b137c0709290858g7749dbdbuebc4baaa500e639@mail.gmail.com> Date: Sat, 29 Sep 2007 11:58:39 -0400 From: "Tracy Crook" Sender: rwstracy@gmail.com To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Oil Delta - T In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_4896_23994595.1191081519295" References: X-Google-Sender-Auth: cca01741ad69fcee ------=_Part_4896_23994595.1191081519295 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline Haven't had any 100+ days since installing the Renesis but cooling is similar to the 2nd gen I had a few years ago when we had 10 consecutive days of 100+ temps. Didn't have to wait it out but simply limited power after initial climbout. Still had more ROC than most certified planes at the reduced power setting. I start with around 2500 FPM on a standard day and never had to settle for less than ~1000 fpm due to heat issues. Hope my 20B RV-8 does as well or better but I will install spray bar for initial tests. Tracy (delayed 20B test schedule due to motorcycle distraction) On 9/27/07, Mark Steitle wrote: > > Tracy, > > So, what do you call a "hot" day? In Austin, it is normal during the > summer for temps to be in the upper 90's and even above 100 on occasion. I > don't want to be grounded waiting for the Texas heat to subside. I guess I > could install a spray bar for summer flying. Right now I can keep temps in > the green up into the low 90's. Living in Texas, I would like a little more > margin than that. Not everyone can swing a summer home in Colorado. ;-) > > Mark S. > (Just happy to be flying again.) > > > > > On 9/26/07, Tracy Crook wrote: > > > > Engine will cool at any throttle setting that enables the plane to fly. > > The coolant & oil temp curve looks about like the power required curve of > > the airframe, minumum at around 95 mph and rises on either side of that > > speed. Only exception is WOT at Vx on hot day. Engine will exceed redline > > temps if this is maintained more than a minute or so. Fortunately there is > > never any real need to do that. > > > > Tracy > > > > > > On 9/26/07, Mark Steitle wrote: > > > > > > Tracy, > > > > > > Is there a particular speed that you must reach before your system > > > cools? > > > > > > Mark > > > > > > > > > > > > On 9/26/07, Tracy Crook wrote: > > > > > > > > For another data point, the delta T on oil cooler depends on power > > > > setting on my installation (no big surprise). It is around 40 degrees F at > > > > higher power settings. > > > > > > > > Tracy > > > > > > > > > > > > On 9/18/07, Mark Steitle wrote: > > > > > > > > > > For those that are flying (rotaries), I'm curious as to what > > > > > delta-T you're seeing across the oil cooler. And at what speed you attain > > > > > adequate cooling. > > > > > > > > > > Mark S. > > > > > > > > > > > > > > > > > > > ------=_Part_4896_23994595.1191081519295 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline
Haven't had any 100+ days since installing the Renesis but cooling is similar to the 2nd gen I had a few years ago when we had 10 consecutive days of 100+ temps.  Didn't have to wait it out but simply limited power after initial climbout.  Still had more ROC than most certified planes at the reduced power setting.  I start with around 2500 FPM on a standard day and never had to settle for less than ~1000 fpm due to heat issues.
 
Hope my 20B RV-8 does as well or better but I will install spray bar for initial tests.
 
Tracy (delayed 20B test schedule due to motorcycle distraction)

 
On 9/27/07, Mark Steitle <msteitle@gmail.com> wrote:
Tracy,
 
So, what do you call a "hot" day?  In Austin, it is normal during the summer for temps to be in the upper 90's and even above 100 on occasion.  I don't want to be grounded waiting for the Texas heat to subside.  I guess I could install a spray bar for summer flying.  Right now I can keep temps in the green up into the low 90's.  Living in Texas, I would like a little more margin than that.  Not everyone can swing a summer home in Colorado.   ;-)
 
Mark S.
(Just happy to be flying again.)
 
 

 
On 9/26/07, Tracy Crook <tracy@rotaryaviation.com > wrote:
Engine will cool at any throttle setting that enables the plane to fly.  The coolant & oil temp curve looks about like the power required curve of the airframe, minumum at around 95 mph and rises on either side of that speed.  Only exception is WOT at Vx on hot day.  Engine will exceed redline temps if this is maintained more than a minute or so.   Fortunately there is never any real need to do that. 
 
Tracy

 
On 9/26/07, Mark Steitle <msteitle@gmail.com > wrote:
Tracy,
 
Is there a particular speed that you must reach before your system cools? 
 
Mark


 
On 9/26/07, Tracy Crook <tracy@rotaryaviation.com > wrote:
For another data point, the delta T on oil cooler depends on power setting on my installation (no big surprise).  It is around 40 degrees F at higher power settings.
 
Tracy

 
On 9/18/07, Mark Steitle <msteitle@gmail.com > wrote:
For those that are flying (rotaries), I'm curious as to what delta-T you're seeing across the oil cooler.  And at what speed you attain adequate cooling.
 
Mark S.





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