Arwel,
I have eyeball vents attached to the side NACA vent, which allows direction of
airflow (including away from the knees). These were made from a ping pong ball
with a bit of tube stuck in it, retained by a split spherical molding that is
in turn clamped (with an o-ring) to a tubular posterior extension of the duct.
It's designed to be frangible/recoverable in the event of knee impact, or worse.
Weight was <2oz per side.
Duncan Mcf
> On 20 November 2022 at 18:27 David Cripps <dpc@knightonweb.com> wrote:
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> Arwel
>
> I have a small sliding hatch in the D-panel in the baggage bay bulkhead that
does exactly what you're suggesting. When this hatch is open, there is
significantly
more draught flowing through the cockpit from the side vents. However,
even with it closed there seems to be enough leakage points in the cockpit (gaps
in door seals, throttle and finger brake lever slots, access hatch in tunnel
between seats to fuel selector valve etc) for there still to be plenty of ways
for air to flow out, at least for the flow you'd want at this time of year.
>
> I find the bigger issue is that the side vents do not direct the incoming air
where you really want it, and mainly freeze your knees! There has been mention
by others of some very nicely designed rotating/flap type vents which do direct
air well, but probably need to be installed instead of the standard side vents
at time of building (or at least it looks like it would be quite a rework
job to fit them as replacements for the current side vents).
>
> This winter I am going to experiment with installing some kind of simple
> moulded
ducting on the inside of the fuselage (maybe even just velcroed onto the carpet
lining for ultimate modifiability) placed over the existing vents. This
would try to 'scoop up' the air from the vents and angle it upwards/inwards. Not
sure if anyone else has tried this but would be interested to hear if they
have.
>
> David
>
> On 20/11/2022, 18:11, "arwel pritchard"
> <owner-europa-list-server@matronics.com
on behalf of arwel.pritchard@powercom.ltd.uk> wrote:
>
>
> Good evening all,
>
> I was thinking about cockpit ventilation the other day and thought that
> I can let plenty of fresh air into the cabin from the two side vents,
> but for proper ventilation, all that air needs to leave the cabin as well.
>
> Then, I thought about putting some kind of ventilation grille in the
> rear access panel. This should allow some air to flow through the
> grille, then on through the fuselage and exit at the rear.
>
> Not sure if this would give adequate venting, or work at all, any
> thoughts please?
>
> Thanks
>
> Arwel
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