X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from ug-out-1314.google.com ([66.249.92.173] verified) by logan.com (CommuniGate Pro SMTP 5.1.11) with ESMTP id 2289247 for flyrotary@lancaironline.net; Tue, 28 Aug 2007 09:56:19 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.249.92.173; envelope-from=rwstracy@gmail.com Received: by ug-out-1314.google.com with SMTP id o4so163658uge for ; Tue, 28 Aug 2007 06:55:40 -0700 (PDT) DKIM-Signature: a=rsa-sha1; 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; b=gEbLdM6ob1l6GJU6gYqD+mpkLV8KLaEQQhccTJdX5S/FSCO3jA5T2XD/0f88aAX7WsG83qGp+vnLq+Wk5kTcTAcnIUk9SzGqFciOv1SvKGE0c0hYUDaxU1ZpwR4aMm4ix6gj/aqDo1aLlCX9h39ZUz792QEH72I7T2xvsDS92jM= 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=k6KP5sRuKgK6edsS8tSLCwdjq1D5s25/ysskyrzJk5hdsQ8Fn7fEP2rSDdclrHD0nC59t6VWUjT2W7MCLCGTUvwJq1yOHI2awxnutE04m+6VI0Rro0z6mBbgwPVC2jl1G9qs0ZxtLgKBUYvjLmayBlUCFJsU+/8Rb8VKoexrfPI= Received: by 10.142.174.8 with SMTP id w8mr571544wfe.1188309338388; Tue, 28 Aug 2007 06:55:38 -0700 (PDT) Received: by 10.142.115.16 with HTTP; Tue, 28 Aug 2007 06:55:38 -0700 (PDT) Message-ID: <1b4b137c0708280655v69ed9589o4b74676a6ff8c53c@mail.gmail.com> Date: Tue, 28 Aug 2007 09:55:38 -0400 From: "Tracy Crook" Sender: rwstracy@gmail.com To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: N4VY flys again In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_132449_10088918.1188309338316" References: X-Google-Sender-Auth: 7d8bd93eacc43abc ------=_Part_132449_10088918.1188309338316 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline I'll have to check out Dan C's website for details Dave. 28 mpg at 180 KTS is impressive. First thing I want to know is at what altitude. I'm guessing in advance that he's done it with airframe cleanups in addition to careful mixture management. When I had all my cleanups on (prop cuffs, "clean" engine air intake, etc) I could get 30 mpg but that was at 160 - 170 MPH and 15,500 ft. With my current configuration (prop cuffs destroyed in high speed pass at Charlie's, super dirty and ugly snorkel engine air intake, various holes and leaks in cowl & cooling diffusers) MPG is down to 25 MPG. Top speed is limited by oil mist blowing out the breather problem. As soon as the engine starts pulling hard at 7200 rpm it starts oiling the belly at a distressing rate. Very frustrating but no time to work the problem. I cruise at 5400 - 5600 so it's usually not an issue unless I'm racing or testing top speed. Most of my flying lately has just been proficiency flights around the home drome. All dressed up with XM weather and no time to go *:>(* Brute HP does go faster but I'm convinced that if I put half the time I spent on engine performance into airframe cleanup instead, I'd be going 20 MPH faster at cruise and MPG would be up as well. Tracy Crook On 8/27/07, David Leonard wrote: > > > > On 8/27/07, Russell Duffy wrote: > > > > After a year and a half of deployment and assorted upgrades, my RV-6 > > finally got back in the skys. And she did great. > > > > Hi Dave, > > > > Great to hear that you're back in the sky where you belong. Sounds like > > plenty of cooling is available for boost, so how much are you planning to > > run? > > > > Rusty > > > > > Thats a good question Rusty. I'm kinda curious about that myself. The > last think I want to do is spend a lot of time rebuilding engines. My goal > for now is to get some trouble free hours under my belt so I don't think I > will push it too hard. I am thinking low 30's for short periods and about > 30" continuous. I can carry that up high and still post some big speed > numbers. > > Of course, that is what I say now, sitting here at my desk.. (best laid > plans an all). First time I get out around the SoCal RV's and some suggests > a little race... well, I probably won't be able to hold back. I am > guessing it will take about 35" at 7000' and maybe 40" at sea level to have > the fastest RV on the block... I suppose she can handle that for a few > minutes :-) > > Then all I will hear about is my fuel burn... sigh. One of the guys, Dan > Checkoway, > www.RVproject.com > (awesome web site, builder, pilot, and all around guy), is posting some > amazing economy with his dual lighspeed and EFI IO-360. In the neighborhood > of 28mpg at 180 KTAS!!! > I cant touch that. > > -- > David Leonard > > Turbo Rotary RV-6 N4VY > http://N4VY.RotaryRoster.net > http://RotaryRoster.net > ------=_Part_132449_10088918.1188309338316 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Content-Disposition: inline
I'll have to check out Dan C's website for details Dave.  28 mpg at 180 KTS is impressive.   First thing I want to know is at what altitude.   I'm guessing in advance that he's done it with airframe cleanups in addition to careful mixture management.
 
  When I had all my cleanups on (prop cuffs, "clean" engine air intake, etc) I could get 30 mpg but that was at 160 - 170 MPH and 15,500 ft.  With my current configuration (prop cuffs destroyed in high speed pass at Charlie's, super dirty and ugly snorkel engine air intake,  various holes and leaks in cowl & cooling diffusers) MPG is down to 25 MPG.   Top speed is limited by oil mist blowing out the breather problem.  As soon as the engine starts pulling hard at 7200 rpm it starts oiling the belly at a distressing rate.  Very frustrating but no time to work the problem.  I cruise at 5400 - 5600 so it's usually not an issue unless I'm racing or testing top speed.  Most of my flying lately has just been proficiency flights around the home drome.  All dressed up with XM weather and no time to go  :>(
 
Brute HP does go faster but I'm convinced that if I put half the time I spent on engine performance into airframe cleanup instead, I'd be going 20 MPH faster at cruise and MPG would be up as well.
 
Tracy Crook 
 
On 8/27/07, David Leonard <wdleonard@gmail.com> wrote:


On 8/27/07, Russell Duffy <rusty@radrotary.com > wrote:
After a year and a half of deployment and assorted upgrades, my RV-6 finally got back in the skys.  And she did great. 
 
Hi Dave,
 
Great to hear that you're back in the sky where you belong.  Sounds like plenty of cooling is available for boost, so how much are you planning to run?  
 
Rusty 


Thats a good question Rusty.  I'm kinda curious about that myself.  The last think I want to do is spend a lot of time rebuilding engines.  My goal for now is to get some trouble free hours under my belt so I don't think I will push it too hard.  I am thinking low 30's for short periods and about 30" continuous.  I can carry that up high and still post some big speed numbers.

Of course, that is what I say now, sitting here at my desk..  (best laid plans an all).  First time I get out around the SoCal RV's and some suggests a little race...  well, I probably won't be able to hold back.  I am guessing it will take about 35" at 7000' and maybe 40" at sea level to have the fastest RV on the block...  I suppose she can handle that for a few minutes  :-)

Then all I will hear about is my fuel burn...  sigh.  One of the guys, Dan Checkoway, 
www.RVproject.com
(awesome web site, builder, pilot, and all around guy), is posting some amazing economy with his dual lighspeed and EFI IO-360.  In the neighborhood of 28mpg at 180 KTAS!!!
I cant touch that.


--
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

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