REFLECTOR:Wing/Canard/Fuselage Incidence

[Jim Sower]

<... As Alex suggests; leveling the fuselage when making incidence measurements is
crucial ...>
How does one level the fuselage of an XL?  My keel is upholstered and doesn't have a
notably smooth surface under the carpeting.  Don't see how it would be a really
accurate (+- 1 deg?) reference.

On pre-purchase inspection, builder had jigs for wing and canard that we put on -
leveled the airplane to the wing jig and checked to see if the canard jig was level
(it was).  That's all I was given.  Builder told me there was no place like a fuselage
reference (longerons ala 173) to use with XL doors (my airplane started off as a 173
and was later retrofitted with gull wing XL doors).

Been wonderin' for quite a while ... Jim S.


Al Gietzen wrote:

> I had problems with my incidence gauges (warped), and I asked Mark
> Machado at Velocity (when he still worked there) what the incidence
> angles really were.  Here is the reply:
> ----------
> -Could not find any documentation regarding incidence angles so we
> measured
> the jigs. The results are as follows (the data should be considered
> preliminary):
>
> canard -   4.6 degrees positive incidence
> standard wing -   0.6 degrees positive incidence
> LW wing -   0.9 degrees positive incidence
>
> The incidence angle is based on the chord line of each individual
> airflow
> and its relationship to a level line. Positive is above level; negative
> would be
> below level.
>
> Margin of error: probably plus/minus .1 degree on each measurement.
> ------------
>
> As Alex suggests; leveling the fuselage when making incidence
> measurements is crucial.
>
> FWIW,
>
> Al
>
> _______________________________________________
> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
>
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html

--
Jim Sower ... Destiny's Plaything
Crossville, TN; Chapter 5
Long-EZ N83RT, Velocity N4095T