There has been a fair amount of discussion over the location of vents in the
Europa,
primarily due to interest in the round Ventomatic style of vent.
The location shown in this post , close to the waterline (WL) of the wing LE, is
probably too low. The shown location differed from that indicated in the build
notes that l have found.
The protruding exhaust disrupts the airflow at this WL, making it turbulen. Two
effects: a) the NACA duct does not work efficiently. b) toxic gases from the
exhaust stub can enter the cockpit.
My Europa has NACA ducts closer to the fuse split line and work very well. As
do many other with the standard duct shape in or around this location.
The demisting of my cockpit is achieved with 2 off PC fans of around
60mmdiameter
mounted in a carbon fibre plate fixed to the P1 side of the panel inner
moulding.
This picks up cabin air, slightly heated by the avionics and instruments
and blows it onto the screen. I fitted it after leaving the aircraft parked
outside for days in autumn, in flight it misted and the side vents were only
effective in helping to demise the screen when flying above 100kts.
I have no DV panel and had to land with limited viz whilst mopping moisture off
the screen. My (then) 11 year old son asking me is this normal?.
So, in my opinion other posts are correct, location, location is the key.
On the ACCEL electric aircraft the team decided to locate a very small NACA duct
just in front of the vast screen and created a duct similar to the one shown
linked in this post. The base of the screen at the centreline is a good taping
point in the Europa, although it would need some surgery and a displaced cowling
break line to make it a fixture. A ductING joint could be fashioned but
Scat hose should not be used as it is high loss.
--------
John Wighton
Europa XS trigear G-IPOD
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