Eddie,
I would fill it again with Polyfiber, as you can do over the smooth primer, and
than sand it back. When filling it I used a flexible metal trowel about 2 feet
wide to run it down the spar, bent to form the shape of the chamber, to fill the
uneven surface either side of the spar. Once cured I then used belt sand paper
of
differing grit up to 320 mounted on a 3 foot long x 4" wide x 1"thickness
piece
of hard wood mounted again on a piece of aluminum with like dimensions (except
1/4"
thickness ) to give it strength and always sanding 45 degrees to the leading
edge
not along the spar line, and be gentle as it sands away quickly.
Worked well. Hope it does for you.
Must come and see you again next time in Londontown.
Cheers,
Tim
bizzarro@easynet.co.uk wrote:
>
> Hi All
>
> Having filled and sanded our wing surfaces, we thought that they were pretty
> good and thus ready for smooth-prime. So smooth-prime we did. However the
> smooth-prime and a trusty lead lamp show that things are not as good as we
> originally thought. Most of the inconsistencies are easily rectified, however,
> it became apparent that there is a dip just in front of and just behind the
> spar. It is only small, and cannot be seen in normal lighting conditions. I
> would say that the dip is about 0.5mm deep approximately 2cm either side of
> the
> spar.
>
> So the questions are this.
>
> Do we
>
> a) Leave it alone as its effect on the airflow over the wing will be
> negligible
>
> Or
>
> b) Fill the dip and sand to blend it into the surrounding surface.
>
> If a, what is the best method? You see, when we were filling this part
> before, it was filled high and sanded down until the cloth on the spar could
> just be seen under the filler. I guess that what was happening was that the
> skin over the foam was flexing in a downward direction whilst being sanded and
> the spar wasnt, hence the discrepancy in the curve.
>
> Any ideas that might help us on this issue?
>
> Cheers
>
> Eddie
>
> G-SELF. Jabiru 3300 powered classic
>
> ---------------------------------------------------
> This mail sent through http://www.easynetdial.co.uk
>
--
Timothy P Ward
12 Waiwetu Street,
Fendalton,
Christchurch,
NEW ZEALAND
Ph. 0064 3 3515166
email ward.t@xtra.co.nz
Mobile 025 2649325
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