Today's Message Index:
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1. 04:13 PM - NEED HELP... Setting wing incidence on a Mk3 Xtra (dirtracin)
2. 05:28 PM - Re: NEED HELP... Setting wing incidence on a Mk3 Xtra (Richard Girard)
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Subject: | NEED HELP... Setting wing incidence on a Mk3 Xtra |
So here is my problem... I have the fuselage leveled from the engine mount from
front to back and left to right... the wings are in line with one anther and
now its time to set the wing incidence... I have a 6' level with a digital angle
finder on top that I am spanning from the leading edge of the wing to the trailing
edge on the bottom side of the wing closest to the wing root... the recommended
wing incidence is 1.4 degrees... so when I set it at that angle the
wing root tab where it gets pinned to the fuselage is way to low to be mounted...
I can only mount it between 3 and 6 degrees so the tab can be mounted to the
fuselage the way I'm doing it... someone please tell me where I have gone wrong...
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=461526#461526
Message 2
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Subject: | Re: NEED HELP... Setting wing incidence on a Mk3 Xtra |
>From where did you get the 1.4 degree incidence setting and from where is
it measured? I believe Bryan's recommendation is 2.8 to 3.5 degrees set
using the engine mount as the zero reference. I urge you to go for the
minimum recommendation.
Here's why; the X was developed to improve the performance of the C. To do
it the cockpit truss was lowered at the front in an effort to decrease the
angle at which the two plane surfaces on the bottom of the fuselage meet.
Barnaby (Wainfan of the Kit Planes "Wind Tunnel" column) wanted to get this
angle to somewhere below 15 degrees so the air could follow this abrupt
change (with a very small radius between) a bit better than it did on the
C. He failed to see that when he did this the new wedge shaped fuselage
would be at a negative angle in cruise flight. What you ended up with was a
wing trying to go up and a fuselage and tail trying to go down. Not very
efficient (the Plane from Hell, a C converted to an X, had actually caved
in the top of the nose cone from the pressure).
So, as I heard the story from Travis, Bryan began experimenting with
reducing the wing incidence. In doing that he had to reduce the angle of
the HS and when those two came right he then needed to make the main
landing gear legs longer to make the aircraft rotate better at take off.
Okay, probably more than you wanted to know.
Rick Girard
On Sat, Oct 22, 2016 at 6:12 PM, dirtracin <igetthebug@gmail.com> wrote:
>
> So here is my problem... I have the fuselage leveled from the engine moun
t
> from front to back and left to right... the wings are in line with one
> anther and now its time to set the wing incidence... I have a 6' level wi
th
> a digital angle finder on top that I am spanning from the leading edge of
> the wing to the trailing edge on the bottom side of the wing closest to t
he
> wing root... the recommended wing incidence is 1.4 degrees... so when I s
et
> it at that angle the wing root tab where it gets pinned to the fuselage i
s
> way to low to be mounted... I can only mount it between 3 and 6 degrees s
o
> the tab can be mounted to the fuselage the way I'm doing it... someone
> please tell me where I have gone wrong...
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=461526#461526
>
>
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--
=9CBlessed are the cracked, for they shall let in the light.=9D
Groucho Marx
<http://www.goodreads.com/author/show/43244.Groucho_Marx>
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