REFLECTOR: Fw: Mag cooling

[Jim Agnew]

Click on the following URL to get PIX
 
https://www.dropbox.com/gallery/7279544/1/2%20Mag%20cooling%20Pix?h=1e980f
 
James F. Agnew
Jim_Agnew_2 at Yahoo.Com
Tampa, FL
Velocity 173 Elite Aircraft Completed & Flying


>
>Hi Dave,
> 
>Sam Dasilva & I both have the system that is shown in the attached picture.  The 3" 12V fan you can clearly see in the picture.  The fan hole allows air to come up behind the baffle and is sucked out by the prop vacuum so you do get some mag cooling.  What you don't see is a small solid state thermostat mounted on the back side of the baffle that turns the fan on when the temp exceeds a certain temp (that I don't remember so I will check). The fan is permanently supplied with power and neither of us have ever had the fan start in flight.  When you shut down after a minute or two the fan turns on and helps to cool down the engine since the  upper Cowl tends to trap hot air and natural convection is inhibited.  The fan gives a boost to starting the convection and normally only runs for a couple of minutes.  Blast tubes will help with mag cooling, however you still need an upper baffle air exit.  I have also attached a pix of the baffle back side
 that shows the fan & thermostat.
> Jim
>
>James F. Agnew
>Jim_Agnew_2 at Yahoo.Com
>Tampa, FL
>Velocity 173 Elite Aircraft Completed & Flying
>
>
>From: David Ullman <ullman at robustdecisions.com>
>>To: reflector at tvbf.org
>>Sent: Wednesday, August 10, 2011 12:00 AM
>>Subject: Re: REFLECTOR: Mag cooling
>>
>>My Tech Advisor asked me to ask if anyone directs cooling air on to the
>>magnetos?  I have two of them on the back of my IO-360-C1C and they
>>currently get no air circulating over them at all.  Seems easy enough to
>>bleed some off the ducts bringing air into the plenum. Is magneto heating a
>>problem for anyone?
>>
>>David G. Ullman PhD ME
>>Robust Decisions
>>ullman at robustdecisions.com
>>541-754-3609
>>
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