X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-pv0-f180.google.com ([74.125.83.180] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4225262 for flyrotary@lancaironline.net; Sun, 18 Apr 2010 00:50:16 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.83.180; envelope-from=wdleonard@gmail.com Received: by pvc22 with SMTP id 22so2470246pvc.25 for ; Sat, 17 Apr 2010 21:49:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:received:message-id:subject:from:to:content-type; bh=LBmLKW1OJh0WPNhEtUYScKztzKn2BsQkw2iHd/f34Kg=; b=BtCHbC+e9BOH3g0UmnjixiNoOVhp8xrm/4QKuvde0m2yNzReDQScdPA4C6kFUGTvDa FAMedb5PwWCajrlJLB76UlwGOM8YW14l0I/nvY08V5MvlMlTGLvSjOY61tXUCPJrPevA tL1214gfPbuj8FKorhzAGLZiBwCyKtWrHryog= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; b=bQU+wENFEZCl/iF2DSZyl5CtAejCNRloT4q+bwDpK7UtunHjpjG6uNEzz+W5lC7Tj4 OLrx330gT6Ue5BviPBsQ6y1AsvuCmLCvKjMLzHot9LX+1WqpiiC578IOLJ3TgW67ysly YaGNgN26i7JGUAL/OQG4QLjKLDTFqFDpbC/vw= MIME-Version: 1.0 Received: by 10.141.36.15 with HTTP; Sat, 17 Apr 2010 21:49:40 -0700 (PDT) In-Reply-To: References: Date: Sat, 17 Apr 2010 21:49:40 -0700 Received: by 10.141.2.21 with SMTP id e21mr3178704rvi.193.1271566180066; Sat, 17 Apr 2010 21:49:40 -0700 (PDT) Message-ID: Subject: Re: [FlyRotary] Re: cooling for ground runs From: David Leonard To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=000e0cd1190c78a69004847b9292 --000e0cd1190c78a69004847b9292 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Thanks Scott, You are right about what I said and I will clarify a little. I say if it wont cool on the ground, it wont cool in the air because when I first started flying I had marginal cooling on the ground and marginal cooling in the air. At that time I could idle and taxi indefinitely unless the OAT wa= s above 85 or so, when my taxi times would be limited to about 30 minutes. cooling in the air was similarly limited to shallow climbs and less than full power in all but the coolest of climates. However, Chris may be talking about high power ground runs which is a different story. A full 5 minutes at full power on the ground is sure to push the limits of most installations, and a temporary spray bar fed from a hose is a reasonable thought if you feel the need to do extended ground run= s at or near full power. BTW Scott, I just took another look at your website and picture. You sure have done very nice workmanship. I can't wait to see that thing fly! It is guaranteed to be one of the fastest RV's around. --=20 David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net On Sat, Apr 17, 2010 at 8:55 PM, wrote: > Chris & Terria: > I had ground running temp issues at lower power. Dave Leonard told me tha= t > it's important to get it to self cool at low to mid power on the ground. = He > said that reliance on sufficient cooling when you come up to flying speed > most likely won't work if it won't self cool on the ground. I took his > advise and redesigned my cooling system, which by the way looks a lot lik= e > yours with major differences being cooler ducting and cooler orientation. > He's a link to my page @ EAA326 site: > http://gallery.eaa326.org/main.php?g2_itemId=3D1727 > Tracy has commented that I should have reduced the cross section of my oi= l > cooler duct more quickly to force the air to uniformly pass thru the oil > cooler core. I applied that thinking to my water cooler which I built nex= t, > and it worked even better than my cardboard and tape trial duct. > What is the engine RPM and % load that you start to have cooling problems= ? > Scott > > > -----Original Message----- > From: Chris and Terria > To: Rotary motors in aircraft > Sent: Sat, Apr 17, 2010 10:02 am > Subject: [FlyRotary] cooling for ground runs > > Gents, > > I am doing the higher power ground runs now, and am only able to run for > about 5 minutes before reaching 195* or so. I=92m looking for ideas on h= ow to > extend the time for each ground run. I was thinking of adding a spray ba= r > like others have discussed. My thought was to drill some holes in some P= VC > and connect it to the garden hose. Then put it in the intake in front of > the radiator. I would have to run the hose out the front and clamp it do= wn > so it doesn=92t come close to the prop. > > I=92m open to all ideas though. > > I=92ve attached a picture that shows my radiator and duct work. > > Thanks, > > Chris > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/Lis= t.html > > > --000e0cd1190c78a69004847b9292 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Thanks Scott,
You are right about what I said and I will clarify a littl= e.=A0 I say if it wont cool on the ground, it wont cool in the air because = when I first started flying I had marginal cooling on the ground and margin= al cooling in the air.=A0 At that time I could idle and taxi indefinitely u= nless the OAT was above 85 or so, when my taxi times would be limited to ab= out 30 minutes.=A0 cooling in the air was similarly limited to shallow clim= bs and less than full power in all but the coolest of climates.

However, Chris may be talking about high power ground runs which is a d= ifferent story.=A0 A full 5 minutes at full power on the ground is sure to = push the limits of most installations, and a temporary spray bar fed from a= hose is a reasonable thought if you feel the need to do extended ground ru= ns at or near full power.

BTW Scott,
I just took another look at your website and picture.=A0= You sure have done very nice workmanship.=A0 I can't wait to see that = thing fly!=A0 It is guaranteed to be one of the fastest RV's around.
--
David Leonard

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

On Sat, Apr 17, 2010 at 8:55 PM, <shipchief@aol.com> wrote:
Chris & Terria:
I had ground running temp issues at lower power. Dave Leonard told me = that it's important to get it to self cool at low to mid power on the g= round. He said that reliance on sufficient cooling when you come up to flyi= ng=A0speed most likely won't work if it won't self cool on the grou= nd. I took his advise and redesigned my cooling system, which by the way lo= oks a lot like yours with major differences being cooler ducting and cooler= orientation. He's a link to my page @ EAA326 site: http://galle= ry.eaa326.org/main.php?g2_itemId=3D1727
Tracy has commented that I should have reduced the cross section of my oil = cooler duct more quickly to force the air to uniformly pass thru the oil co= oler core. I applied that thinking to my water cooler which I built next, a= nd it worked even better than my cardboard and tape trial duct.
What is the engine RPM and % load that you start to have cooling probl= ems?
Scott


-----Original Message-----
From: Chris and Terria <candtmallory@embarqmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Sat, Apr 17, 2010 10:02 am
Subject: [FlyRotary] cooling for ground runs

Gents,
=A0
I am doing the higher power ground runs now, and a= m only able to run for about 5 minutes before reaching 195* or so.=A0 I=92m= looking for ideas on how to extend the time for each ground run.=A0 I was = thinking of adding a spray bar like others have discussed.=A0 My thought wa= s to drill some holes in some PVC and connect it to the garden hose.=A0 The= n put it in the intake in front of the radiator.=A0 I would have to run the= hose out the front and clamp it down so it doesn=92t come close to the pro= p.
=A0
I=92m open to all ideas though.
=A0
I=92ve attached a picture that shows my radiator a= nd duct work.
=A0
Thanks,
=A0
Chris




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