Re: Airflow over the canard


David J. Gall
 

Larry,

Those spinning yarns at midspan are probably plus or minus about 20 degrees
in line aft from the mid-span elevator hinge, no?

David J. Gall

----- Original Message -----
From: "L Koutz" <koutzl@Surfsouth.com>
To: <Q-LIST@egroups.com>
Sent: Thursday, September 14, 2000 8:10 PM
Subject: Re: [Q-LIST] Re: Airflow over the canard



Jon
My tufts (3 of them) mid elevator did the same thing, spin around, that
is.
I don't remember which direction. What do you think of that!?!
Larry


----- Original Message -----
From: "Jon Finley" <finley@collector.com>
To: <Q-LIST@egroups.com>
Sent: Thursday, September 14, 2000 9:10 AM
Subject: RE: [Q-LIST] Re: Airflow over the canard



Guys,

I've been reading your thoughts and pondering my experiences. I really
do
not know what is happening so any ideas that I may offer are only
GUESSES!!

I do not recall if my tuft "bank" moves one way or the other when
airflow
is
gone/degraded/disturbed/etc BUT I do know that I have one tuft that
likes
to
spin in circles almost all the time. It attached in the middle (both
horizontally and vertically) of the left (pilot side) elevator, is about
three inches long, and spins clockwise about the end that is attached to
the
elevator (with a really small piece of fine tape). Next time I fly I
will
pay attention to see if there is a direction that all tufts move.

Keep up the discussion - fun stuff!! For all those that are flying -
put
a
few tufts on your canard and tell us what they are doing!! It takes
about
five minutes, is free (unless you don't have tape and
yarn/string/whatever),
and you may learn something about your airplane!
Jon Finley
Q1 N54JF - 1835cc VW
Q2 N90MG - Subaru EA-81 DD Turbo
Apple Valley, Minnesota
http://63.90.191.136/Finley/finley-subaru.html



-----Original Message-----
From: Ed MacLeod [mailto:ed@mtir.com]
Sent: Thursday, September 14, 2000 7:49 AM
To: Q-LIST@egroups.com
Subject: [Q-LIST] Re: Airflow over the canard



My Groups | Q-LIST Main Page | Start a new group!


--- In Q-LIST@egroups.com, "L Koutz" <koutzl@S...> wrote:
Hi Larry,

I have a hard time dreaming up another expaination for the inboard
flowing tufts. With the elevators down, you get a strong wing tip
vortex at the outer elevator edge. The flow on the top would be
inboard. Seal the outer (and inner?) edges of the elevator and you
eliminate this vortex flow, the tufts should not flow inboard as
readily.
This is why they add droopy wing tips to stol aircraft, to make it
harder for the vortex to roll back onto the trailing edge of the wing
and disrupting the normal airflow over the wing.

As always, I could be wrong.

Ed m



> Ed
>
> I don't read the tufts moving inboard together as a sign that air
is
leaking
> through the outboard elevator/ canard gap. I don't know why they do
this
> just yet.
> Larry
>
> > Hi Larry,
> >
> > It sound like the inboard leak phenomenon is occurring at the
> > outboard end of the elevator. Does this agree with your
observations?
> > Perhaps the prop is blasting away the air leaking in at the root
and
> > the outboard leak becomes more significant.
> >
> > Ed m
>




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