REFLECTOR: Lay up c question

[Steve Goldman]

Matt Bucko wrote:
>  
> 
>     I have all of my glass cut for lay up c of the wing/winglet joint. I
>     have my wing bottom up, winglet outside surface facing me. I have
>     the foam installed and formed. My question is.... what to do with
>     all of the glass which extends past the forward edge of the rudder
>     crank box.  Measured from the area of the LE, the forward edge of
>     the box is about 16 inches aft. The glass is 20 inches wide.
>     Do I:
>     1. Cut the class and lay it up inside the box walls?
>     2. Cut the glass around the box area?
>     3. Something else?

I asked about this a few months back. That width for C was never 
really changed when the bellhorn went inboard in the wing. In the 
video they made a cave for the bellhorn and glassed over it. The plans 
no longer call for that cave. The glass for the cave is useless for 
strength since the glass isn't in tension so it's nothing but weight, 
by the time it could load in tension the winglet has long since broken 
off.

I checked with the factory and they agreed with my analysis that the 
glass over that cavity contributes no strength. Use the widest glass 
you can forward of the bellhorn cavity. As a result this caused me to 
narrow most of the layup a little bit so that you get a taper of the 
edges.

-- 
Steve Goldman
'77 Tiger N28531
Velocity XL5-RG (T-2762 hrs) N758SG (reserved)
Pittsboro, NC (9NC8)
http://fatcatair.com