X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-gw0-f52.google.com ([74.125.83.52] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4465372 for flyrotary@lancaironline.net; Mon, 13 Sep 2010 15:20:29 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.83.52; envelope-from=wdleonard@gmail.com Received: by gwj20 with SMTP id 20so2638702gwj.25 for ; Mon, 13 Sep 2010 12:19:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=2O9oCpux5ZHta66A9lDiFqe5AlyErtA6v7AJvVhObmo=; b=hH29pvTpPGBLC/UZN9ybqUaYZaruloUbYxYmCNNK0MaZWeaVaZ66R3pxnA48cB+tCo ZkRYeNae9y4FukFFHYn/T7mDQ1NdJnmqYMAFTr7ubN2ncQR4xAwnDtpIQnutLPjHZ4vx sBBle7hOKnLF0RVfGygXWzONPy0i/9/UnNcC8= 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=iiHiJpnitnJHD9tZ6QhzkeebdoKb/Crmwu6oP4yh5cQtb4iTsYs5AmP2SYHhn7uM00 ruCWGiz5FrgQ5x1yfI0j0FcwfF9LZ11IYpms4ra5RHglu+l/LqtjGpzuqLvcGP22qTIl bBndUoJNaUd1ePO0wIG5tuPvW7t2HzXDRXeUE= MIME-Version: 1.0 Received: by 10.150.92.9 with SMTP id p9mr734989ybb.198.1284405594795; Mon, 13 Sep 2010 12:19:54 -0700 (PDT) Received: by 10.231.171.68 with HTTP; Mon, 13 Sep 2010 12:19:54 -0700 (PDT) In-Reply-To: References: Date: Mon, 13 Sep 2010 12:19:54 -0700 Message-ID: Subject: Re: [FlyRotary] Re: Scheduled hose replacement From: David Leonard To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=000e0cd47b2839ae7e049028fba5 --000e0cd47b2839ae7e049028fba5 Content-Type: text/plain; charset=ISO-8859-1 On Mon, Sep 13, 2010 at 11:53 AM, Charlie England wrote: > On 9/13/2010 1:02 PM, David Leonard wrote: > >> >> >> *The radiator manufacturer will have a maximum number based on how >> >> stiff the flat sided tubes are. Too much pressure rounds those >> tubes and then pulls them loose from the fins when pressure is >> removed. Also the rounded tubes slow airflow through the radiator. * >> *Racing radiators tend to have higher pressure ratings than auto >> radiators. * >> *Most racers run 16 to 22 pound caps. Higher pressure means higher >> boiling temp for the coolant. Also more stress on the >> connections. With a 2" hose and 22 pounds you have just about 70 >> pounds trying to pull the hose off of the fitting. With silicone >> hose and safety wired clamps it would not be a factor. That does >> not include Chinese replica clamps. Just real American made name >> brand clamps. You can also use real aircraft quality clamps >> already drilled for safety wire. * >> *Many modern cars use no pressure cap. Just a sealing filler cap >> on a make up bottle.* >> *An air space above the coolant level provides a volume of air to >> compress to control the pressure. If the moron at the gas station >> fills that bottle all the way up while reading the message on the >> bottle not to fill above this line,* >> *the end tank will blow off of the radiator just like on my wife's >> car. * >> ** >> *The 22 pound cap is middle ground, a bit more insurance, not >> likely to hurt the radiator. * >> ** >> *I use 22 pounds. Distilled water with 10% glycol and either >> Redline Water Wetter or 1/2 teaspoon full of dish washing >> detergent. It is gentle on the hands. Never a problem since 1980.* >> *Lynn E. Hanover* >> >> >> Hey Lynn and the rest of you smart guys, What is your opinion on scheduled >> hose replacement? My plane has been flying for 6 years now and I just >> finished the annual. I decided that 6 years was long enough on some of my >> radiator hose and decided to replace it. In particular, I ordered up the >> AN-16 steel braided hose (Earls Perform-o-flex) for my coolant out line but >> I just couldn't bear the thought of cutting and fitting that stuff and >> hoping I don't get leaks or damage the AN hose fittings or cut my fingers to >> shreds. So I decided the current hoses were good for another year. Maybe a >> justification... >> >> Opinions on scheduled replacement of SS hose? >> >> -- >> David Leonard >> >> Turbo Rotary RV-6 N4VY >> http://N4VY.RotaryRoster.net >> http://RotaryRoster.net >> > I would copy the guy with the most trouble free hours on his coolant hoses. > :-) > > Charlie > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > Nice Charlie, For braided SS in aircraft use, that might be me.. Guess I just keep going until I land on another highway... ;-) -- David Leonard Turbo Rotary RV-6 N4VY http://N4VY.RotaryRoster.net http://RotaryRoster.net --000e0cd47b2839ae7e049028fba5 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable

On Mon, Sep 13, 2010 at 11:53 AM, Charlie Englan= d <ceenglan= d@bellsouth.net> wrote:
=A0On 9/13/2010 1:02 PM, David L= eonard wrote:


=A0 =A0*The radiator man= ufacturer will have a maximum number based on how=20

=A0 =A0stiff the flat sided tubes are. Too much press= ure rounds those
=A0 =A0tubes and then pulls them loose from the fins wh= en pressure is
=A0 =A0removed. Also the rounded tubes slow airflow throu= gh the radiator. *
=A0 =A0*Racing radiators tend to have higher pressure ratings than auto
= =A0 =A0radiators. *
=A0 =A0*Most racers run 16 to 22 pound caps. Higher = pressure means higher
=A0 =A0boiling temp for the coolant. =A0Also more = stress on the
=A0 =A0connections. With a 2" hose and 22 pounds you have just about 7= 0
=A0 =A0pounds trying to pull the hose off of the fitting. With silicon= e
=A0 =A0hose and safety wired clamps it would not be a factor. That doe= s
=A0 =A0not include Chinese replica clamps. Just real American made nam= e
=A0 =A0brand clamps. You can also use real aircraft quality clamps
=A0 = =A0already drilled for safety wire. *
=A0 =A0*Many modern cars use no pr= essure cap. Just a sealing filler cap
=A0 =A0on a make up bottle.*
= =A0 =A0*An air space above the coolant level provides a volume of air to =A0 =A0compress to control the pressure. If the moron at the gas station=A0 =A0fills that bottle all the way up while reading the message on the=A0 =A0bottle not to fill above this line,*
=A0 =A0*the end tank will = blow off of the radiator just like on my wife's
=A0 =A0car. *
=A0 =A0**
=A0 =A0*The 22 pound cap is middle ground, a = bit more insurance, not
=A0 =A0likely to hurt the radiator. *
=A0 =A0= **
=A0 =A0*I use 22 pounds. Distilled water with 10% glycol and either=A0 =A0Redline Water Wetter or 1/2 teaspoon full of dish washing
=A0 =A0detergent. It is gentle on the hands. Never a problem since 1980.*=A0 =A0*Lynn E. Hanover*


Hey Lynn and the rest of you smart gu= ys, What is your opinion on scheduled hose replacement? =A0My plane has bee= n flying for 6 years now and I just finished the annual. =A0I decided that = 6 years was long enough on some of my radiator hose and decided to replace = it. =A0In particular, I ordered up the AN-16 steel braided hose (Earls Perf= orm-o-flex) =A0for my coolant out line but I just couldn't bear the tho= ught of cutting and fitting that stuff and hoping I don't get leaks or = damage the AN hose fittings or cut my fingers to shreds. =A0So I decided th= e current hoses were good for another year. =A0Maybe a justification...

Opinions on scheduled replacement of SS hose?

--
David Leona= rd

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net
I would copy the guy with the most trouble free ho= urs on his coolant hoses. :-)

Charlie
--
Homepage: =A0http://www.flyrotary.com/
Archive and UnSub: =A0 http://mail.lancaironline.net:81/lists= /flyrotary/List.html



Nice Charlie,

For braided SS in aircraft use, that might be me..=A0 Guess I just kee= p going until I land on another highway...=A0 ;-)
--
David Leonard
Turbo Rotary RV-6 N4VY
ht= tp://N4VY.RotaryRoster.net
http://RotaryRoster.net
--000e0cd47b2839ae7e049028fba5--