Hi! Ron.
Take a look at my hot air exit flap for my Jabiru 3300. However I never
use it because it did not contribute to the engine cooling! But for
Rotax users who knows?
Look on http://WWW.crixbinfield.freeserve.co.uk/europa.htm select "Bob
Harrison's Europa G-PTAG Then "cooling mods" then scroll down to "hot
air exit flap" and "vent flap linkage".
I already have the lower cowl "jacked" about 1.5" away from the fuselage
which with the existing reverse scoop still provides adequate hot air
escape volume even though the engine is totally air cooled.
The theory on my flap was that it would provide more vacuum effect and
lower the cowl air pressure. In reality I think it was a good air
brake!
I stiffened up the existing cut out by the use of some balsa ribs
glassed to the inside running along the airflow and the whole flap is
hinged by two 3" lengths of aileron hinge at the front.
The problem that may be encountered is "flutter" at high speed, mine
doesn't but probably by more luck than judgement !
Regards
Bob Harrison G-PTAG Europa MKI/Jabiru 3300
Robt.C.Harrison
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Ronald J.
Parigoris
Subject: Europa-List: Cowl flaps?
<rparigor@suffolk.lib.ny.us>
Hello Cliff
Hope all is doing well by you.
Our motor and prop are on order, looking forward to tackling the pointy
end!
Thinking about how to incorporate a Cowl Flap, and like your set up. I
don't
have any feel for what sort of loads such a thing has.
Can you give me some sort of heads up as to how hard it is to deploy,
are your
hinges robust enough, is there a speed max, and max deploy if closed
speed? If
you were to do it again, any comments?
I have glider wings, and plan on installing a oil thermostat as well.
Thx.
Sincerely
Ron Parigoris
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