Hi Ira
Thx. for the reply.
How are you cooling your radio, transponder and EFIS?
I agree that a Cyclone style fan is more efficient at cooling a devise than
removing
the stratified/rarefied air that gets stuck at the top of instrument module
(mine is flush to firewall). It is also more complicated and makes for more
plumbing.
See:
http://www.europaowners.org/forums/gallery2.php?g2_itemId=78355
Quite a few folks that have computer fans at top of instrument module say that
demisting is quite effective. I fooled with the fans I am using in my car, I
chose
a night where windscreen was fogging and put two fans about same spacing
---From window and width spacing as they will be in Europa. If I added defrost
heat
with car air conditioning blowing it clears up fog right away, but only small
fans even on low (series) did clear up enough to see through.
I have 2 fans situated over com radio and transponder, and 2 fans over Dynon. I
forget the temperature at which the Dynon quits, but figure best not have it
happen in flight when you need it.
It is not only radio, transponder and Dynon heat that needs to be dealt with, it
is also heat that is given off from firewall/footwells. When testing fans I
put a piece of clear plastic on firewall side of instrument module to replicate
firewall and ducted convected heat from two 1500 watt electric/oil heaters (set
on high) inside instrument module. After a few minutes could get inside temp
to ~ 140F with fans not running (but there are gaps). Turning fans even on
low reduced temps quickly. I have a temperature sender inside instrument module
so I can monitor temps.
Ron Parigoris
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