Mailing List flyrotary@lancaironline.net Message #65164
From: A R Goldman argoldman@aol.com <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Part specs-radiator design
Date: Fri, 6 Sep 2019 12:24:40 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Not totally true as I learned from overheating my norton rotary dragonfly. It makes sense that air flows from high pressure to low. But. Many times oh has a mind of its own counterintuitively. For example as the air exit the exchanger if it is not allowed to exit straight or gently deflected, independent of the delta the air will stagnate and not go where you expect. Pay as much attention to the exit as you do with the entry

Yrmv

Rich

Sent from my iPhone

On Sep 6, 2019, at 11:52 AM, William Jepson wrjjrs@gmail.com <flyrotary@lancaironline.net> wrote:

Answer is nothing; provided the airflow is there. Also there needs to be a vent or tap to get all the air out of the inside.
Bill Jepson 

On Fri, Sep 6, 2019 at 8:38 AM Marc Wiese cardmarc@charter.net <flyrotary@lancaironline.net> wrote:
Finn asks-
"BTW, what happens when you lay down (at a 20 degree) angle a radiator that is designed to be upright?"

I always wondered about that myself. The stock FD (3rd gen) radiator has to be at about a 45 degree angle (?) to the incoming airstream. And it has 2 "supplemental" staged electric fans (no pump fan), one is always on if the AC is on, the fans have different blades and different speeds controlled by ECU and temp sensor. I suppose the fins are canted or perhaps they are best tilted to airflow to create turbulence and help remove some heat..........don't know much about radiator design............
MW

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