bakerocb
Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA
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 Posted: Wed Jul 30, 2014 7:41 am Post subject: Questions: |
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7/30/2014
Hello Jesse, You wrote:
1) “I am lowering the trailing edge of the flaps and ailerons to a point
where a string, when stretched from the high point on the wing to the
trailing edge touches the hinge line.”
That works for me, but I am curious as to why you are working so extensively
on this aspect of the wing shape?
2) “ Is this really the proper setting?”
I think that it depends upon one’s definition of “proper”. I would think
that there are two aspects of what is proper:
a) One aspect is what would give the absolute optimum aerodynamic
performance.
b) The other aspect is what gives the best, or at least an acceptable
appearance on the ground.
My thinking regarding a is that one could struggle mightily to obtain the
absolutely best possible fillet, wing, flap, aileron, and wing tip
configuration for an airplane built from a KIS TR-1 kit and the normal pilot
would probably not be able to detect the performance difference between that
optimum result and one that the normal builder would create just following
the plans as best he could.
One caveat to that statement is that I think that a significantly modified
wing to fuselage fillet such as Julian Bone did can make a significant
performance difference in the slow flight regime in order to overcome a too
pinched in wing to fuselage design.
Regarding b above that is a very personal aspect of building and owning an
EAB aircraft and I would not presume to coerce anyone else to my standards
in that regard as long as the appearance did not adversely affect safety.
3) “.... a triangle shaped leading edge on the forward side of the wing next
to the fuselage. What does this do?”
That triangle or wedge is called a stall strip. This web site will discuss
this, and many other related wing tweaking devices in some detail. See here:
http://www.airspeedalive.com/writings/stallcharacteristics.html
4) “I thought, you being an engineer might have worked with such a
configuration and know the reason for such an extension.”
Another aerodynamic tweak is to install a vortex generator on the fuselage
just forward of the wing. If you look real carefully at the pictures of the
Cirrus SR 22 at this web site:
http://cirrusaircraft.com/sr22/
you will see a little projection on the fuselage just forward of the wing
that looks like an antenna. This helps solve the same problem, too much
pinch in at the wing to fuselage juncture, that Julian Bone was solving with
his expanded wing to fuselage fillets.
I made a pair of these vortex generators out of aluminum and taped them to
the sides of my KIS TR-1 fuselage in various locations. I was having fun
testing them out, but got lazy one day and did not use fresh tape. The
result was that I lost one of the generators in the air and never got around
to making another one so the testing is in abeyance.
OC
===============================================
From: flyinisfun(at)aol.com
Sent: Tuesday, July 29, 2014 10:33 PM
To: bakerocb(at)cox.net
Subject: Questions:
O.C.,
I am reworking my wing fillets for the 3rd and I hope the last time. I
am lowering the trailing edge of the flaps and ailerons to a point where a
string, when stretched from the high point on the wing to the trailing edge
touches the hinge line. I had about 1/2" gap there before. I was going to
set the wing fillets and end cap's trailing edge to match the ailerons. Is
this really the proper setting? This is the setting on all factory builds I
checked.
Also, I have been looking at single engine Beechcraft and others that
have a triangle shaped leading edge on the forward side of the wing next to
the fuselage. What does this do? Does it increase lift at slower speeds?
I thought, you being an engineer might have worked with such a configuration
and know the reason for such an extenstion. Thanks for any information.
Jesse Wright
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