Tom Bernie wrote:
> Guys,
> If you build cabane length to the CAD or previous plans you will end up with
zero or minus angle of incidence (from mean cord line). The plane will fly tail
low (as reported) with added trim drag and you won't be able to touch down
at stall speed with out hitting the tail wheel first. I physically measured the
angle of my center section to confirm 1.5 degree a.o.i. with the aft struts
1" shorter.
> Tom Bernie
> Gloucester Mass
> N666TB
>
> On Mar 18, 2010, at 6:28 AM, skellytown flyer wrote:
>
>
> >
> >
> > Jon I expect you will get many answers on that.I like you bought my project
and the cabanes were done. I believe DJ made them both longer to help with entry
and with more angle of attack to help the fuselage fly more level since he
thought many of the planes flew in a tail low attitude.naturally it flies with
the wing at the right angle to provide the needed lift and your fuselage angle
is determined by that. so he reasoned that having slightly longer front cabanes
would level the fuse in flight.at least that's what I remember him telling
me.does that make sense or help? I'm currently trying to finish up the cowling
so I can start final assembly. Where are you located?Raymond. Texas panhandle
> >
> >
> >
> >
> > Read this topic online here:
> >
> > http://forums.matronics.com/viewtopic.php?p=290729#290729
> >
> >
> > Tom,
> >
> > My plans are the hand drawn plans with a copyright date of 1992 and on sheet
6 it shows the cabanes with a dimension of what appears to be 21" and an edit
referring to page 7. I am not sure if the edit was part of the plans or done
by my planes original builder. On Page 7 it calls out the cabanes as 21" front
and 21 3/4" rear. My cabanes are 23 1/2" for all 4.
> > If my calculations from my own personal CAD layout of the airfoil are correct
then I now have 1.71 degrees of incidence. ( will strike a chord line on my
center section to verify with my drawing) If your GN-1 has them 1" shorter then
it would seem like there is quite a bit more incidence, all things being equal.
I need to measure more.
> >
> > Thanks for the input.
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
--------
Jon Coxwell
GN-1 Builder
Recycle and preserve the planet
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=290771#290771
