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Date: Mon, 13 Sep 2010 15:40:22 -0500
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Scheduled hose replacement
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  Yes, there is occasionally method to my madness.

I figured Ed had you beat, but I'm pretty sure there's someone else with 
even more hours, if not calendar time, on high quality automotive hoses.

Charlie

On 9/13/2010 2:33 PM, Ed Anderson wrote:
> 'Frad not Dave,
> My SS radiator hoses (AN-16) have over 10 years on them - no 
> replacement, no leaks (so far).  However, were I to do it again, I 
> would probably not go SS due to cost and weight - but reliability has 
> been absolutely great.
> Ed
> Edward L. Anderson
> Anderson Electronic Enterprises LLC
> 305 Reefton Road
> Weddington, NC 28104
> http://www.andersonee.com
> http://www.eicommander.com
>
> *From:* David Leonard <mailto:wdleonard@gmail.com>
> *Sent:* Monday, September 13, 2010 3:19 PM
> *To:* Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
> *Subject:* [FlyRotary] Re: Scheduled hose replacement
>
>
>
> On Mon, Sep 13, 2010 at 11:53 AM, Charlie England 
> <ceengland@bellsouth.net <mailto:ceengland@bellsouth.net>> 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://n4vy.rotaryroster.net/>
>         http://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