Frans=0Aagree it's-surprising-that there is higher pressure in the-ru
dder-closeout. It is probably due to the reduction in pressure=0Aas the a
irflow accelerates to pass the wide fuselage, then slows down as it rejoins
the ambient air. That implies=0Agood pressure recovery on the rear fuselag
e so less drag!=0AGraham=0A=0A=0A________________________________=0A From:
Frans Veldman <frans@privatepilots.nl>=0ATo: europa-list@matronics.com =0AS
ent: Monday, 30 July 2012, 20:13=0ASubject: Re: Europa-List: Mylar seals an
s@privatepilots.nl>=0A=0AHi Pete,=0A=0A> My seals are all on the top surfac
e and the hinge line of the rudder.=0A=0AAh, I also did the underside of th
e ailerons and the underside of the=0Atailplanes.=0A=0A> I will be most int
erested to hear the results of your stall speed tests. I=0A> would have exp
ected hot and high to have had an opposite effect on=0A> performance.=0A=0A
What do you mean? You expected the performance to get worse by using=0Aseal
s? Or the other way around?=0A=0A> My rudder is also a poor fit at the bott
om, the fuselage is too wide, how=0A> ever it is probably in turbulent air
off the prop. =0A=0AWell, after I applied seals on the hinge line of the ru
dder, I noticed=0Athat I need more right rudder than before. I have a small
trim tab to=0Aget a neutral rudder during cruise, but I had to bend the tr
im tab quite=0Aa bit more to the left after I applied the seals. So at leas
t the seal=0Ais doing something, be it good or bad.=0A=0AMore right rudder
needed is actually the opposite effect of what I=0Aexpected. Can't explain
why this is or what the implication is.=0A=0AThe rudder is anyway a mystery
to me. I have a vent opening in the=0AD-panel and connected a scat hose to
it to a similar opening to the=0Arudder closeout. The idea here is that th
e rudder closeout is a low=0Apressure area, due to the shape and also due t
o the gaps, and helps the=0Aair vacate the cabin to improve ventilation. Od
dly enough though, the=0AD-panel opening not sucks the air out of the cabin
but actually blows a=0Alot of air *into* the cabin! My doors don't leak, I
have no other=0Aopenings in the cabin. I have no idea where that air comin
g in from the=0Arudder is going and why the rudder closeout is a higher pre
ssure area=0Athan the cabin. Really weird. If anyone has an idea I would lo
- - - - - - - - - - - - -Matt Dralle, List Admin.
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