I had to use the defrost last Sunday taking a lesson with Bob Jeffery in Bend, Oregon with periodic rain showers taking place. That's really the only time I have needed it. It was needed while taxing.
Larry -
That would be OK if you want to have the cabin heat up high enough to where it would cool the stack and then defrost. The defrost pattern would probably be only a couple of small circles before the flow cooled to where it was colder than the windscreen. You really do need to defrost a wider portion of the windscreen, and only the plenum would do this. If one needs more defrost air, a fan in the duct feeding the heat/defrost valve would be one solution.
Question for all on this list: When has anyone had to use defrost while flying their Lancair?
IMHO there are not many :-))
Cheers,
John
Question
Wouldn't putting these fans in blowing
up help with the defrost. It seems that at OSH I was talking to a
360 guy that did this with great results. This is what I have been
planning on using instead of the defrost plenum that the legacy is design
with. Any thoughts?
Thanks
LarryE
Addendum:
The bezels on our avionics boxes with this fan setup are cool to the
touch. I believe that it is best to blow air down from the glare shield
vents, rather than up. We don't notice any heat increase on our feet.
The fans noted below can also be had in 24 volts. I believe the mfg part
#
is 3324
Cheers,
John
On Wed, 30 May 2012 11:59:14 -0400, John Schroeder
<jgschroeder2@windstream.net> wrote:
> Dan -
>
> We have two fans mounted on the glare shield that suck air down from
the
> cabin air vents and over the avionics stack. We had one before but
> decided to add the second one because the stack avionics were still
> running hotter that we felt was comfortable. They are small "muffin"
> fans we got from Allied Electric. http://www.alliedelec.com/
Papst
> Fan: Mfr's Part #: 3312 12V
> Allied Stk #: 70105405
>
> John
>
>
>
>
> On Tue, 29 May 2012 13:09:41 -0400, Dan Ballin <dballin@gmail.com>
wrote:
>
>> Anyone have experience thoughts on using a fan in the glare shield
on
>> a Legacy to cool the avionics. I am concerned about pulling
air out
>> towards the canopy and onto the plexiglass, but I believe this
would
>> result in better cooling. I do have a avionics fan, but
it still gets
>> mighty hot behind the panel.
>>
>> Thanks
>> Dan Ballin
>> N386DM
>>
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