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where to collect air for air instruments

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graeme bird

Joined: 15 Jul 2010
Posts: 434

Posted: Mon Nov 15, 2010 1:10 pm Post subject: where to collect air for air instruments

I am considering collecting the air for my air instruments from within the instrument panel molding and adding a row of holes at the top at the bottom of the windscreen, The plan being to draw air over the windscreen and keep it mist free. Is this normal? or is there some other aspect I should consider?

Its a venturi scheme I am using



Thanks

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_________________
Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk

gholland(at)content-strea
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Posted: Mon Nov 15, 2010 1:34 pm Post subject: where to collect air for air instruments

Graham Hi!

I blew air up over front screen using 2 X 12V Computer Fans controlled by

variable resistance from warmer air in Instrument panel housing. They worked

well. The Fans were small at about 50cms maximum as remember. If you intend

to draw air down screen in some way by reduced pressure I'm not sure that

will work as you are drawing the cabin air down that is already causing

mist.

The screen will attract mist throughout Autumn to late spring so it's worth

an investment in a solution. Others will make comment I'm sure.

Regards

Gerry

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rparigoris

Joined: 24 Nov 2009
Posts: 805

Posted: Tue Nov 16, 2010 12:26 am Post subject: Re: where to collect air for air instruments

Hi Graeme



I put up some info on panel cooling and demisting ideas:

http://www.europaowners.org/forums/gallery2.php?g2_itemId=78355



My install is near the bottom of this page:

http://www.europaowners.org/forums/gallery2.php?g2_itemId=27305

I went with 4 tiny fans using a three position switch that offers me 2 speeds.

I tested a lot of fans, the ones I selected really do offer twice the volume on haldf the amp draw of similar motors.



When shop is quiet boy do 4 fans sound sweet.



Demisting should be better than nothing and should be able to keep my Dynon and radios happier.

Ron Parigoris

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