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Date: Thu, 24 Jun 2004 12:47:12 -0400
From: Mike Robert <pmrobert@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Oil cooler air velocity was : [FlyRotary] Visit
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Haywire wrote:

> then your air velocity through your cooler will be
>  
>
>>approx 0.1 - 0.3
>>of your airspeed.  So for a 200 MPH speed you might have 20 -60 mph air
>>velocity through your cooler fins not 200.  Just though I would
>>mention it.
>>    
>>
>
>Hi Ed;
>	Do you really think that it will be this fast? Even say through the Evap
>cores? The reason I ask is that I've just installed a fan on the back side
>of one of my evap cores to be used in conjunction with one of my EWP's to
>reject cowl/engine heat after shutdown. I assumed/guessed that the airflow
>exiting through the evap core will be slowed down to <5mph. I don't have any
>data to support this, it just seemed reasonable.
>	I didn't add a shroud around the fan as I didn't want to hurt in-flight
>cooling by forcing all of the air through the fan blades, even though this
>will make the fan less efficient. But I think if it does see up to 60 mph
>airflow then it's lifespan will indeed be short.
>  
>
Auto experience: The RX-7 first gens place the oil cooler directly in 
the incoming air flow, no ducting or anything special to slow the air 
down, it's just sitting right there under the front bumper. I have a 12 
volt fan from a 19" computer rack cooling system bolted to the back of 
it and it hasn't exploded/debladed/etc. yet after numerous miles at 80 
mph. I power the fan only when stuck in traffic after a heat soaking 
fast run and the oil temp is creeping past 200F. I'm quite surprised at 
it's longevity. YMMV, obviously. Doesn't John Slade use a Ferrari fan 
for his coolant radiator app?

>S. Todd Bartrim   (completing panel modification/upgrade)
>Turbo 13B RV-9Endurance
>C-FSTB
>http://www3.telus.net/haywire/RV-9/C-FSTB.htm
>
>   "Whatever you vividly imagine, Ardently desire, Sincerely believe in,
>Enthusiastically act upon, Must inevitably come to pass".
>
>  
>

       -Mike

>
>  
>