I'm also considering a flap in the cold air NACA vent, being now convinced
that under cowl air etc temps. are sufficient to prevent carb icing.
However, the problem is that the walls of the vent are not vertically
parallel so that when the flap is trimmed to fit the floor of the duct (in
the open position) it is then too small to cover the duct in the closed
position; it leaves a large (c1/4") gap around the edges of the flap when
closed. Maybe some thin and flexible "wiper" material attached around the
edge of the flap would; but what?
Duncan McF.
----- Original Message -----
From: "Brian and Pat Tarmar" <freefolk@screaming.net>
Subject: Europa-List: Rotax 912 Carburettor Heat Kit
<freefolk@screaming.net>
>
> I am currently agonising over whether to fit the Skydrive carburettor heat
kit, but am concerned that it introduces yet more pipery to any already
cluttered environment with even more chance of failure.
>
> Has anyone introduced a moveable flap to the XS top of cowl NACA vent to
shut off cold air during likely icing conditions (and rain while parked) and
use the somewhat warmer source from inside as an alternative?
>
> Finally, if I do go ahead with the heater, is it necessary to move the
plenum chamber back to accommodate the heat jackets? (I am just about to
lay-up the skirt seal flange)
>
> Brian Tarmar G-OBJT 055 Classic Trigear with XS mods - (entering the tenth
and FINAL year of a build begun by John Grant!!!)
>
>
|